Hi Sunny, Fnormal is the force on the block by the table. It is called Fnormal to indicate the direction of the force is normal (meaning it is at an angle of ninety degrees to the surface). In the real world there are friction forces as well as air resistance. So if we were to try to do this experiment in the real world we would find that the block would slow down due to the friction and air resistance forces. Regards Mac
Hi Nico, I can't reply to your comment as you have that option disabled. Friction exists in the world around us. It is not possible to have frictionless (zero friction) surfaces. However we sometimes consider what would happen if a surface was frictionless to consider the application of a theory in the extreme case. This can give direction on how we would ideally like to design objects. For example, in an engine we know that if we reduce friction to a minimum the engine is more efficient as there is less resistance to the engine as it operates. Regards Mac
I am writing a physics cycle test tomorrow about three of Newtons laws so am going through all of them to help me understand them more and so far this video helps so much, it explains the law very clearly and practically...
Hi Ram, Yes you are correct, the block will continue to move as shown until an unbalanced external force is applied. The key point to remember is that it has to be an "unbalanced" force applied before the block will start to change its motion. In the example in the video the forces are balanced and therefore the block will keep moving in a straight line for ever. Amazing isn't it? Mac
+Marrius Eratic Hi Marrius. Thanks for your question. Newton's first law does not address failure, it only tells us the response of an object to force in terms of its motion. In the example you have described, the force due the weight of the boxes in the tower eventually exceeds the force carrying capability of the bottom box. The box then fails to be able to continue to carry the force and collapses (often referred to as a buckling failure). The tower would try and collapse straight down as you put it, but in practice the boxes would interact with each other introducing random interaction forces which would result in the tower collapsing in a random direction. The force on the bottom box is higher than any of the other boxes and it would collapse first assuming all boxes had the same strength. Note that to understand this you need to realise that the force experienced by the box material increases linearly from the top of the box tower to the very bottom of the tower. So the highest force experienced is in the bottom box at the edge close to the ground. Regards Mac
Hi Moose. The point you are discussing is the use of vectors to define quantities such acceleration and velocity. These have direction as well as magnitude. Speed is not a vector as it does not require the definition of direction and has only a magnitude. It is the magnitude of the velocity.The key thing to remember is that some quantities have both magnitude and direction. When using vectors you normally define a coordinate system to make it easier to solve problems.
Hi Jason, thanks for your question. Why do you feel the box (block) will not move in a straight line to the right? If the block was moving and you wanted it to change direction you would need to push it to change direction. Once the block leaves contact with the piston in the video there are no other forces acting on it (assuming zero friction and zero air resistance). The block will therefore continue in a straight line until a force acts on it to change its direction. Mac
Hi Marc, thanks for your comment. I agree that the best approach is to have the arrow starting from the centre of mass. I considered this in the production of the video but found that the two arrows crossed over each other and it was confusing so decided to have them as shown. In my new video on Newton's third law I now draw the arrows as you do and I have used colour transparency and three dimensional arrows to achieve clarity in presentation as well as accuracy in arrow location. Mac
Your three videos are the perfect well-rounded videos to watch when you don't understand the laws of motion. They briefly, but they explain in a very well way how these laws work. Thanks! :D
Hi Adam, If the car is sitting still on black ice and all forces are in balance it wouldn't move as stated in the first law. If you were to go up to the car and gently blow on it the forces would no longer be in balance and the car would start to move. Newton's second law tells us that since the car has significant mass and the force from you blowing is relatively small there would only be a small acceleration. However the car could get to a high speed if you continued to blow for a long time.
At 2:16 you draw an arrow depicting the gravitational force. However, I always teach my students that the back end of an arrow representing the gravitational force must be in the (mass)center of the object, because the attaching point of gravity is in the (mass)center of the object.
Thanks for your feedback Keith. I'm pleased you feel the pace of the videos are good as it is a challenge to judge how much information to provide during the the video. I'll use this to help me in the development of my video on the third law which you can see on my website is now under development. Regards Mac.
Hi Angelejy, the mass of the object results in a force we call weight which is due to gravity. Gravity results from the attraction between Earth and the object under consideration.This means there is only one force arrow for this which we call the weight or gravity force. The direction of this always points to the centre of mass of the Earth. Since we use the Earth as a reference to down and the sky as up, in practice the weight force arrow always points down. Mac
Hi Syardian. The answer may surprise you. If there is no friction on the table and no air resistance then the block will never stop. It will move forever at the same velocity as it had when it left the piston since there is zero net force acting on it. This is what the first law tells us. If there is zero net force on the block then it will stay at rest or keeping moving. If there is friction it will stop and you would need to use Newton's second law to calculate the stop distance. Mac
Adam, your other comment raised a good point about balanced and unbalanced forces. In order to better understand the laws it is a good idea to use them to try and explain situations you see in life and discuss your thoughts with friends and teachers. Regards Mac
@Mential Hi Mential, Yes you are correct. Once the object starts moving along the table, and assuming that the table does not resist the motion, then the object will continue moving in a straight line forever. Never slowing down or speeding up, just moving with constant velocity for eternity. Amazing isn't it!. In everyday life we never see this since there are always resistance forces acting such as friction. Regards Mac
Hi Hairprincess, Yes you are correct. In the physical world in which we live, friction is always present. However in studying theory such as Newton's 1st law we often consider what would happen in the extreme case. In this case that is no friction. Why do we do that? Well it can often give us ideas about how we should design mechanisms and other mechanical systems. If we reduce friction in a moving system through the use of a lubricant will it keep moving longer? What does the1st law tell you?
@evilslig Yes that's right. The sum of forces must be zero in the direction of motion for it to keep moving. See my movie on the second law which explores this a little further. Thanks for commenting. Mac
Hi Leah. Thanks for your comment. The third law is about action and reaction forces. You can see these in my new video on my channel which is a trailer for my soon to be released video on the third law. When sitting on a horse there are forces between the rider and the horse - if that was not the case then the rider would fall of the horse. Think about how those forces between the rider and horse change in magnitude as the horse accelerates and jumps. Best of luck in your project. Mac
Hi Angel. In the video I explain that the highly polished surface in my virtual laboratory provided no resistance to the moving block (that is no friction). In the real world in which we live this never occurs - there is always friction present. So why do I show a zero friction surface in the video? It helps us explore the law in the extreme case of no friction and the result is surprising - the block would never stop moving. This knowledge is why we lubricate devices - they take longer to stop.
Well ok, i understand that your virtual laboratory provided no resistance to the moving block and that therfore it could probaly continue in that state for infinity. Although if you where to take something that is almost as nonfrictional as your table, that being black ice. My point being that wound't it in that case mean that cars in perfectly still postions have the ability to move. But in what direction and at what speed would this occur in ? Takeing note that there is minimal friction ...
Oh my gosh you are the coolest person in this entire world of physics.You make much much much easier.I HAVE A FINAL 2MRO.YOU JUST MADE IT MUSH EASIER!!!
Hi Hassan, thanks for your comment. I think the word you are referring to is "interaction". By this I mean that the law explains the way in which forces affect the motion of an object. Mac
Hi Thermospecialist, I agree that it is important to define force. However I have assumed that the viewer has had some introduction to forces before viewing the video. I need to make some assumptions otherwise the video would be too long. I may make a video on defining force, mass and acceleration to complement this video at a future date. Thanks for your feedback. Mac
Hi, can you answer this question? 1. What will the block do if it is not acted upon by a force? 2. Are there forces on all sides of the block? Explan please. 3. In the situlation why does the block stay in motion after it is pushed by the pistion?
OK I know it is difficult. Try and work through it step by step. What does the law tell you happens when a force acts on an object? Try and describe it in your own words.
Unbalanced forces do not exist, but in theoretical frames of reference only. With an as yet not existing correct understanding of forces, Newton's third law applies regardless what reference system is considered. This correct understanding also explains inertia. See: watch?v=91bCIC5krik
1)what is Fnormal mac? 2)according to newton ,body continues its motion untill no external force is applied on it but why will the block or object in motion stops after some time even if we dont touch it ?
Great video, but does that mean that it will continue no matter what in eternity unless it's held back by any forces? If you are in a room where you have for instance a table like in the clip, with no resistance so that the horisontal force only gets that first kick from the left making the horisontal balance unstable, the object will continue forever?
What if the table extended onward out of the atmosphere of the Earth and into space. Let's assume that it feels no resistance at all (not from the air nor the surface). Would the block continue to move and completely escape the Earth's gravity? The only change I can think of is the angle at which gravity starts pulling on the object. As the earth curves away gravity should start pulling on it more and more from the back side eventually slowing it down to a stop, reversing its direction of motion and pulling it back to the piston. It should then hit the piston with exactly the same amount of force that the piston hit it the box the first place. I think I just answered my own question while writing this. Anyway if you see anything wrong here let me know.
Agen0000 Hi Agen, yes that is a good analysis of what would happen. The only point to be careful about is when it returns to the piston. It would not necessarily apply the same force. It would have the same magnitude of velocity as when it left the piston in the opposite direction. The force experienced by the piston would depend on the stiffness of the piston. The force from the piston will act long enough to bring the block to zero velocity. However if it does this over a long time, the force will be very small. Alternatively if it brings the block to zero velocity in a very short time, the force will be very high during that short period in order to decelerate the block. You can appreciate this if you think about what happens if you were to sit down on a hard chair compared to sitting down on the chair with a soft cushion on top. The force being applied is lower with the cushion but acts for a longer time. Regards Mac
learnwithmac right. I forgot that the piston would have to make the exact same motion as it did the first time, only in reverse. Only then would it experience the same force it did the first time. If the piston did not move at all as the block returned to hit it I suspect the block would bounce off it and go back and forth forever.
Thanks for your comments Imran. The next video is in planning now so it will be a few months before it is released. The video will be about Newton's third law of motion. I will be releasing images of the new video on my website as it progresses. Regards Mac
Also, sorry if i sound stupid from my other post, im new to phyics and im sure there are other laws to explain the electromagnatude of energy that is all around us and how it can be stengthend by simply useing one of the 3 laws you mention. Or am i completly crazy ?
Hey Professor Mac. I have a question. Please answer it. So the wooden box exert a force from the piston and it is continue to move forward right? So why it doesnt change the postion. It cannot move to a straight line I think it should move and will fall from the ground because. I think it cannot move a straight line tho? How?
hello professor mac from your experiment what it is known that the wooden block wont stop unless and until an external force is acted upon it . am i right?
@DannyHacker1 Thanks for your feedback Danny. It's a balance to get the right amount of detail at the right pace for everyone so I'll keep your comment in mind as I develop my future videos. Mac
Yes that is correct Nathan. Ignoring air resistance and friction from the surface, there are no horizontal forces acting and therefore it will continue for ever moving in a straight line at constant speed. It's amazing to think about it and realise that is what would happen. We never see this in our everyday lives since there are forces acting which would slow it down. Regards Mac
You are correct Diego, air resistance will slow the block down over time. The faster the movement of the block, the more air resistance. You can feel this for yourself as you go on a bicycle. If you are going slow you don't notice the air in your face but as you increase the speed of the bicycle you can feel the force of air resistance increasing. If the block is moving very slowly along the surface, the air resistance is very small, but it will eventually slow the block down as you have observed. Regards Mac
Yes it would but he point being explained is that it is only with resistance forces present that the block would slow down. If there were no forces it would keep going. Think about what that means if you were in space with no air.
I see this in my fever dreams
Hi Sunny, Fnormal is the force on the block by the table. It is called Fnormal to indicate the direction of the force is normal (meaning it is at an angle of ninety degrees to the surface). In the real world there are friction forces as well as air resistance. So if we were to try to do this experiment in the real world we would find that the block would slow down due to the friction and air resistance forces. Regards Mac
Thanks for your feedback. I'm pleased it helped you enjoy learning about the first law. Regards Mac.
Hi Nico, I can't reply to your comment as you have that option disabled. Friction exists in the world around us. It is not possible to have frictionless (zero friction) surfaces. However we sometimes consider what would happen if a surface was frictionless to consider the application of a theory in the extreme case. This can give direction on how we would ideally like to design objects. For example, in an engine we know that if we reduce friction to a minimum the engine is more efficient as there is less resistance to the engine as it operates. Regards Mac
Thanks for your feedback Dijonalis. Good luck in your studies.
Regards Mac
Best of luck in your exam Meme.
Mac
hey mac! u deserve more than merely being liked by us on youtube.... i love ur explanations a lot
I am writing a physics cycle test tomorrow about three of Newtons laws so am going through all of them to help me understand them more and so far this video helps so much, it explains the law very clearly and practically...
Best of luck with your test tomorrow Nakawele. Thanks for your feedback.
Mac
Hi Ram, Yes you are correct, the block will continue to move as shown until an unbalanced external force is applied. The key point to remember is that it has to be an "unbalanced" force applied before the block will start to change its motion. In the example in the video the forces are balanced and therefore the block will keep moving in a straight line for ever. Amazing isn't it? Mac
+Marrius Eratic Hi Marrius. Thanks for your question. Newton's first law does not address failure, it only tells us the response of an object to force in terms of its motion. In the example you have described, the force due the weight of the boxes in the tower eventually exceeds the force carrying capability of the bottom box. The box then fails to be able to continue to carry the force and collapses (often referred to as a buckling failure). The tower would try and collapse straight down as you put it, but in practice the boxes would interact with each other introducing random interaction forces which would result in the tower collapsing in a random direction. The force on the bottom box is higher than any of the other boxes and it would collapse first assuming all boxes had the same strength. Note that to understand this you need to realise that the force experienced by the box material increases linearly from the top of the box tower to the very bottom of the tower. So the highest force experienced is in the bottom box at the edge close to the ground. Regards Mac
Hi Moose. The point you are discussing is the use of vectors to define quantities such acceleration and velocity. These have direction as well as magnitude. Speed is not a vector as it does not require the definition of direction and has only a magnitude. It is the magnitude of the velocity.The key thing to remember is that some quantities have both magnitude and direction. When using vectors you normally define a coordinate system to make it easier to solve problems.
Hi Jason, thanks for your question. Why do you feel the box (block) will not move in a straight line to the right? If the block was moving and you wanted it to change direction you would need to push it to change direction. Once the block leaves contact with the piston in the video there are no other forces acting on it (assuming zero friction and zero air resistance). The block will therefore continue in a straight line until a force acts on it to change its direction. Mac
Hi Marc, thanks for your comment. I agree that the best approach is to have the arrow starting from the centre of mass. I considered this in the production of the video but found that the two arrows crossed over each other and it was confusing so decided to have them as shown. In my new video on Newton's third law I now draw the arrows as you do and I have used colour transparency and three dimensional arrows to achieve clarity in presentation as well as accuracy in arrow location. Mac
I completely agree with you. This video could not have been any more easier and quicker to understand, Thanks for uploading them Professor Mac!
you made me pass my test thank mac for showing me newton law of motion
Your three videos are the perfect well-rounded videos to watch when you don't understand the laws of motion. They briefly, but they explain in a very well way how these laws work. Thanks! :D
Hi Adam, If the car is sitting still on black ice and all forces are in balance it wouldn't move as stated in the first law. If you were to go up to the car and gently blow on it the forces would no longer be in balance and the car would start to move. Newton's second law tells us that since the car has significant mass and the force from you blowing is relatively small there would only be a small acceleration. However the car could get to a high speed if you continued to blow for a long time.
Thank you, I have my final tomorrow and this really helped!
At 2:16 you draw an arrow depicting the gravitational force. However, I always teach my students that the back end of an arrow representing the gravitational force must be in the (mass)center of the object, because the attaching point of gravity is in the (mass)center of the object.
Thanks for your feedback Keith. I'm pleased you feel the pace of the videos are good as it is a challenge to judge how much information to provide during the the video. I'll use this to help me in the development of my video on the third law which you can see on my website is now under development. Regards Mac.
Hi Angelejy, the mass of the object results in a force we call weight which is due to gravity. Gravity results from the attraction between Earth and the object under consideration.This means there is only one force arrow for this which we call the weight or gravity force. The direction of this always points to the centre of mass of the Earth. Since we use the Earth as a reference to down and the sky as up, in practice the weight force arrow always points down. Mac
Hi Syardian. The answer may surprise you. If there is no friction on the table and no air resistance then the block will never stop. It will move forever at the same velocity as it had when it left the piston since there is zero net force acting on it. This is what the first law tells us. If there is zero net force on the block then it will stay at rest or keeping moving. If there is friction it will stop and you would need to use Newton's second law to calculate the stop distance. Mac
Adam, your other comment raised a good point about balanced and unbalanced forces. In order to better understand the laws it is a good idea to use them to try and explain situations you see in life and discuss your thoughts with friends and teachers. Regards Mac
3:10
POV: You ejected the imposter
Thanks for your feedback Abdul.
Mac
I'm pleased you found it helpful Shane.
Regards Mac
This video is very helpful. Very thankful, Professor Mac.
Glad it was helpful!
I'm pleased to have been of help Lim. Thanks for your feedback.
Mac
Hey thanks for newtons first law this really helped me!
@Mential Hi Mential, Yes you are correct. Once the object starts moving along the table, and assuming that the table does not resist the motion, then the object will continue moving in a straight line forever. Never slowing down or speeding up, just moving with constant velocity for eternity. Amazing isn't it!. In everyday life we never see this since there are always resistance forces acting such as friction. Regards Mac
Hi Hairprincess, Yes you are correct. In the physical world in which we live, friction is always present. However in studying theory such as Newton's 1st law we often consider what would happen in the extreme case. In this case that is no friction. Why do we do that? Well it can often give us ideas about how we should design mechanisms and other mechanical systems. If we reduce friction in a moving system through the use of a lubricant will it keep moving longer? What does the1st law tell you?
@evilslig Yes that's right. The sum of forces must be zero in the direction of motion for it to keep moving. See my movie on the second law which explores this a little further. Thanks for commenting. Mac
Hi Leah. Thanks for your comment. The third law is about action and reaction forces. You can see these in my new video on my channel which is a trailer for my soon to be released video on the third law. When sitting on a horse there are forces between the rider and the horse - if that was not the case then the rider would fall of the horse. Think about how those forces between the rider and horse change in magnitude as the horse accelerates and jumps. Best of luck in your project. Mac
Hi Angel. In the video I explain that the highly polished surface in my virtual laboratory provided no resistance to the moving block (that is no friction). In the real world in which we live this never occurs - there is always friction present. So why do I show a zero friction surface in the video? It helps us explore the law in the extreme case of no friction and the result is surprising - the block would never stop moving. This knowledge is why we lubricate devices - they take longer to stop.
God bless you professor, with your ilustration I can undarstand these things.... thank you verry much
Mac, you are a legend. You have helped me so much with my Science test. When I get an A+, I will be sure to thank you in my acceptance speech.
Okay Cesarini Thanks for your feedback Okay. Mac
Daniel Cesarini what did you get ?
@@Constant. D
Thanks for your feedback Harry.
Mac
I'm glad it helped Suhas.
Mac
Oh wow, that was great, I am really grateful for that Professor Mac!!! Thank you so much, you make learning this so much more fun!
Well ok, i understand that your virtual laboratory provided no resistance to the moving block and that therfore it could probaly continue in that state for infinity. Although if you where to take something that is almost as nonfrictional as your table, that being black ice. My point being that wound't it in that case mean that cars in perfectly still postions have the ability to move. But in what direction and at what speed would this occur in ? Takeing note that there is minimal friction ...
All of your videos are great, easy to understand...thanks professor Mac! please add more videos.
Thanks for your feedback Richard. Mac
Oh my gosh you are the coolest person in this entire world of physics.You make much much much easier.I HAVE A FINAL 2MRO.YOU JUST MADE IT MUSH EASIER!!!
Thank you proffesor your videos i understand very well
I'm pleased you like them Raju. Mac
Hi Hassan, thanks for your comment. I think the word you are referring to is "interaction". By this I mean that the law explains the way in which forces affect the motion of an object.
Mac
Hi Thermospecialist, I agree that it is important to define force. However I have assumed that the viewer has had some introduction to forces before viewing the video. I need to make some assumptions otherwise the video would be too long. I may make a video on defining force, mass and acceleration to complement this video at a future date. Thanks for your feedback. Mac
Thank you QZXYC for your kind words. Regards Mac
Thx for the info i truely needed it for school and i hope you will help me on later projects! :)
Hi, can you answer this question?
1. What will the block do if it is not acted upon by a force?
2. Are there forces on all sides of the block? Explan please.
3. In the situlation why does the block stay in motion after it is pushed by the pistion?
Hi Liezl. I'd be interested in hearing what you think the answers are.
@@LearnwithMaconline i dont know
OK I know it is difficult. Try and work through it step by step. What does the law tell you happens when a force acts on an object? Try and describe it in your own words.
Thanks MC
Thanks it helped in understanding the first law of motion
thanks a lot i have also told my friends about your videos on youtube
Well done Mattu. Thanks for your comment. Mac
Unbalanced forces do not exist, but in theoretical frames of reference only. With an as yet not existing correct understanding of forces, Newton's third law applies regardless what reference system is considered. This correct understanding also explains inertia. See: watch?v=91bCIC5krik
your videos are nice and easy to undersatand for any person....you are doing well job...
Thanks for your feedback Abbas. Mac
You legend, best teacher ever
+Harjinder Sandhu Thanks for you feedback Harjinder. Mac
Thank you so much for sharing, I will use it for my class.
Isabel Janeth Lòpez M. Thanks Isabel, I hope your class enjoys it. Regards Mac
Thanks Max
Mac
Keep up the great job...When is the next video coming, and what will it be about?
1)what is Fnormal mac?
2)according to newton ,body continues its motion untill no external force is applied on it but why will the block or object in motion stops after some time even if we dont touch it ?
Thanks Rishabh.
Mac
Great video, but does that mean that it will continue no matter what in eternity unless it's held back by any forces? If you are in a room where you have for instance a table like in the clip, with no resistance so that the horisontal force only gets that first kick from the left making the horisontal balance unstable, the object will continue forever?
Thanks Himansh
Mac
@learnwithmac However, that's also assuming that there is no air resistance either; a gas or oxygen free environment, such as outer space.
This was extremely helpful
Thanks Claire. Mac
Thanks for your comment Nazmi.
Mac
Thanks Vikas
Mac
What if the table extended onward out of the atmosphere of the Earth and into space. Let's assume that it feels no resistance at all (not from the air nor the surface). Would the block continue to move and completely escape the Earth's gravity?
The only change I can think of is the angle at which gravity starts pulling on the object. As the earth curves away gravity should start pulling on it more and more from the back side eventually slowing it down to a stop, reversing its direction of motion and pulling it back to the piston. It should then hit the piston with exactly the same amount of force that the piston hit it the box the first place.
I think I just answered my own question while writing this. Anyway if you see anything wrong here let me know.
Agen0000 Hi Agen, yes that is a good analysis of what would happen. The only point to be careful about is when it returns to the piston. It would not necessarily apply the same force. It would have the same magnitude of velocity as when it left the piston in the opposite direction.
The force experienced by the piston would depend on the stiffness of the piston. The force from the piston will act long enough to bring the block to zero velocity. However if it does this over a long time, the force will be very small. Alternatively if it brings the block to zero velocity in a very short time, the force will be very high during that short period in order to decelerate the block. You can appreciate this if you think about what happens if you were to sit down on a hard chair compared to sitting down on the chair with a soft cushion on top. The force being applied is lower with the cushion but acts for a longer time. Regards Mac
learnwithmac right. I forgot that the piston would have to make the exact same motion as it did the first time, only in reverse. Only then would it experience the same force it did the first time.
If the piston did not move at all as the block returned to hit it I suspect the block would bounce off it and go back and forth forever.
this will help me on my test tomorrow thank you very much.
and by the way i like your accent :D
elias alramahi Thanks Elias. I hope you do well on your test. Regards Mac
Hope your test goes well Chuck.
Mac
Thanks for your comments Imran. The next video is in planning now so it will be a few months before it is released. The video will be about Newton's third law of motion. I will be releasing images of the new video on my website as it progresses. Regards Mac
awesome video sir mac :)
Pleased that you found it helpful Rajendra.
Mac
please upload more vedio. I learn a lot and very clearly from this . please please please upload more vedios
Hi Yogesh. Check out my CZcams channel for more videos. Thanks for your feedback. Mac
I'm 23 now and I did this in Secondary School, the whole class wouldn't stop laughing. XD
Thanks mac
Hi Taehee, I don't understand what you mean by unbalanced qh? Would you clarify please?
Also, sorry if i sound stupid from my other post, im new to phyics and im sure there are other laws to explain the electromagnatude of energy that is all around us and how it can be stengthend by simply useing one of the 3 laws you mention. Or am i completly crazy ?
very nice and thank you
Hi Alex, I don't understand your question. Would you clarify please?
Mac
Very interesting.
thank you
thanks this is perfect cause i have a huge science test tomorrow and i want to ace it.
can u say me which is the software u used to create this animated video its really gudd and informative
very helpful
I was wondering something... what is ''ideal frictionless?'' Can someone tell me this? thanks this will help
thanx mac
Very nice👌👍
Thanks a lot
ty u sooo much sir
Hello learnwithmac please explain with animation Black hole low Rs=2GM/c2.
Hey Professor Mac.
I have a question. Please answer it.
So the wooden box exert a force from the piston and it is continue to move forward right? So why it doesnt change the postion. It cannot move to a straight line I think it should move and will fall from the ground because. I think it cannot move a straight line tho?
How?
hello professor mac from your experiment what it is known that the wooden block wont stop unless and until an external force is acted upon it . am i right?
@DannyHacker1 Thanks for your feedback Danny. It's a balance to get the right amount of detail at the right pace for everyone so I'll keep your comment in mind as I develop my future videos. Mac
can u tell me that when will u upload your more videos thanks
awsome video
Wouldn't the block go on forever because the table causes no resistance? Thanks Professor Mac!
Yes that is correct Nathan. Ignoring air resistance and friction from the surface, there are no horizontal forces acting and therefore it will continue for ever moving in a straight line at constant speed. It's amazing to think about it and realise that is what would happen. We never see this in our everyday lives since there are forces acting which would slow it down. Regards Mac
For this experiment, wouldn't the wood block be affected by wind resistance, causing it to slow down eventually? Thanks!
You are correct Diego, air resistance will slow the block down over time. The faster the movement of the block, the more air resistance. You can feel this for yourself as you go on a bicycle. If you are going slow you don't notice the air in your face but as you increase the speed of the bicycle you can feel the force of air resistance increasing. If the block is moving very slowly along the surface, the air resistance is very small, but it will eventually slow the block down as you have observed. Regards Mac
Wouldn’t the block slow down though? Wind/air resistance would slow it to a stop, no matter how smooth the surface is.
Yes it would but he point being explained is that it is only with resistance forces present that the block would slow down. If there were no forces it would keep going. Think about what that means if you were in space with no air.
Very Very good video :)
Hi Mac I have a science project on newtons 3rd law of motion how can I demonstrate the 3rd law with horseback riding