Forces on a lift and particle inside | ExamSolutions

Here I look at the forces acting on a lift and a particle inside the lift as it moves at constant speed, accelerates and decelerates.
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[@JBuns02]

If you’re in a rush this video is perfectly comprehendible at 1.5x speed :)

[@Gungus-v1g]

2x speed is fine too!

[@matheogarrett8353]

@@Gungus-v1g 0.75x is also good

[@crotgb]

Tf u on about? I watch literally everything on 2x speed

[@puddleduck1405]

ahaha thanks! I have a test in a few hours!

[@prodxtendo]

@@crotgb its not healthy since it can cause memory loss and concentration problems. same goes for short form content like TikTok and CZcams shorts.

[@sarahsahibqran2198]

I love the way you lay out all your solutions it's so neat and tidy!

[@ExamSolutions_Maths]

Thanks

[@monicaxoxo1965]

This is great but did he say SHIT OUT AT THE END

[@mirrabibjawad9706]

lmao i noticed it as well

[@padawan1769]

Took me by surprise lmaoo

[@rohanverma6058]

I had no clue what the equations my teacher was writing in lessons but now you have cleared so much up for me with you deep and very applicable style of teaching. Thank you for these videos, you should feel proud for educating students so well.

[@ExamSolutions_Maths]

Rohan thanks. This is much-appreciated feedback.

[@afraafra1858]

The note is very neat and clean. ...I love it

[@davidhill8163]

I was struggling with this.. your explanations have really given me a lift ! 💥

[@ExamSolutions_Maths]

I'm so glad!

[@nina_o4851]

This was very helpful! thank you so much!!

[@josephmacklin2773]

I like how most of these equations are subtly just f=ma

[@emanalantar465]

that's really helpful thank you

[@ahmedlssj]

oh ok now i understand

[@laurenrose5309]

Very helpful. Thank you

[@ExamSolutions_Maths]

Good to hear. Thank you.

[@toby2031]

5:26 If acceleration is a vector, then if "a" is negative, T_1 would not always be greater than T? Since it would be (M+m)g - (M+m)a
Which bit am I missing

[@Alex-fm2ik]

Is R2 the force exerted by the person?

[@ExamSolutions_Maths]

No that is the reaction from the floor exerted on the person. The force exerted by the person is their weight, mg N

[@liquidstephen5104]

*10:36

[@fbdjwjflac]

At 6:40, surely if the reaction force is bigger, surely you'd feel yourself being pushed upwards, not driven down into your seat, because the reaction force is an upward force?

[@JamieD1233]

The seat is being driven upwards in comparison so you so as it pushes you up inertia makes you feel pushed down

[@ahmedlssj]

Is deceleration as same as downward acceleration.

[@ExamSolutions_Maths]

+Ahmed Hassan No. Deceleration is when something is slowing down. Deceleration is the same as negative acceleration.