Ballistic Pendulum Problem

Physics Ninja looks at the Ballistic Pendulum physics problem. A bullet is fired into a heavier wooden block and the system swing up some height H. Conservation of linear of momentum is used followed by conservation of energy during the swing portion. A numerical example is done at the end to find the initial velocity of the bullet

[@felipebanegas]

Amazing. An excellent video I truly appreciate THIS content

[@dtgiabao9915]

Thank you so much. Just one question. Why is the string tension force always perpendicular to the block's movement? As in the diagram it is making a theta angle.

[@azrielshacham6829]

Let me take it further. what is the minimum required speed of the bullet in order to turn the pendulum a full circle without loosen the rope tension

[@samanthas2767]

Great video, thanks!

[@ashishmishra2925]

thank you sir, love from india

[@Thewildstinkypenguin]

Thank you so much

[@daniloalvaro2142]

so clear explanation thank you

[@haripatel122]

Hi, just wondering how you find the maximum angle moved from the vertical by the block of wood. any tips are greatly appreciated!

[@PhysicsNinja]

If you know the maximum height and the length of the string try drawing a triangle and use trigonometry to find the maximum angle.

[@haripatel122]

@@PhysicsNinja what if you're not given the length of the rope in the question? I'm doing one which has most of the variables apart from the length

[@oveja9975]

what if you're given the length of the string and the maximum angle, how do you find h?

[@PhysicsNinja]

H=L-Lcos(theta). If theta=0, H=0, if theta=90, H=L.

[@oveja9975]

@@PhysicsNinja thank you so much!

[@jym8005]

Where did you get this problem? This problem was in my midterm exam and i expect that my professor writes final exam questions in similar book , but i can’t find the original textbook. Can you help me:)?

[@PhysicsNinja]

This problem is found in a lot of college level Physics books.

[@jym8005]

I know but my midterm problem has exact same situations, figures you solved in your video! I want the exact textbook name. If you don't know, it will be okay:) I'm sorry that I'm not good at English. Thank you!

[@GospodjicaB]

If we have a pendulum assembly with a rod (mass is 20 g) do we include that for the uppercase M or do we just look at the mass of the block rather than the mass of the whole pendulum assembly? Also, how would we measure the angle it reaches with a protractor? Would it be from the right edge of the block or from the top of the pendulum assembly because I am getting two different values? Thanks :)

[@armanbarzani4148]

Lmao imagine if he responds after a year

[@GospodjicaB]

@@armanbarzani4148 I don't think that's happening at this point lol plus I finished my physics sequence last semester

[@lostinnothingness21]

Thanks sir, what if the quastion gave the tention in the cord after the swing. how would we write the energy then

[@TharemaPretty]

Hi, I need help with this question but it's a little different. Can you please help me?

[@izak1437]

How would you solve for height if it is not given? (vertical displacement and length of string is given)

[@Lou2beme]

What if you don't have the maximum height only the speed right after the collision?

[@dv4346]

Awesome video, thanks I understand! Would this be considered a perfectly inelastic collision, or simply an inelastic collision?

[@malyesa7676]

He states the answer to your question right there in the video

[@2ndgeneration348]

why nobodies solving for maximum angle after collision xD

[@BabuBabu-pd7cz]

Tammy Tammy