Connected Particles - Smooth table with pulley : ExamSolutions Maths Made Easy

[@sabeenshahid2024]

I can't thank you enough. This was a really troubling topic for me before I watched this. Your videos are still coming in handy for so many students years later!

[@deezus1750]

Thank you for this video this has really helped me with my homework 👍

[@ExamSolutions_Maths]

That's good to hear. Thanks for watching.

[@ExamSolutions_Maths]

It is always a good idea, yes.

[@RehannahB]

Ty. Made it so much simpler

[@Alixhw]

exam solution save my life

[@adielbvepfepfe4179]

Amazing Stuff

[@namey100]

helpful thanks

[@dan_devs]

Great video thanks!! But one question though,Why for particle A you ignored the 0.8g(weight) and the reaction force? How can we ignore the weight ,doesn't it cause friction and affects the system? for example if we say Particle A is 500kg and B is 2kg,surely due to the weight of the particle A, B wouldn't have moved down wards.right?

[@ExamSolutions_Maths]

+Daniel Danaee It's a smooth table, no friction.

[@dan_devs]

hmm i see,Thanks!

[@soju6179]

The last question asks for speed but doesn't using the SUVAT equation give you the velocity and not the speed. What do we do to further calculate the speed from the velocity?

[@adarsh601]

The speed is just the magnitude of the velocity. So if the velocity was -5, the speed would be 5. If the velocity is positive like in this question, then it is numerically equal to the speed.

[@innerbeautyout99]

how would you find the force acting on the pulley?

[@ExamSolutions_Maths]

+innerbeautyout99 Go on my site www.examsolutions.net/maths-revision/mechanics/dynamics/connected-particles/force-on-pulley/tutorial-1.php

[@Ayan_721]

thanks mate

[@ExamSolutions_Maths]

No problem - thanks for watching

[@yun1666]

how to decide the direction of tension？

[@Teeps1921]

Tension acts in the opposite direction object B is going so acts up. Tension attempts to pull two objects together so acts right for object A

[@sohduhamel3044]

Let's say the was a frictional force how are you going to solve it please I need help

[@adrispidie12-brawlhalla]

i am a student so i may be right or wrong, but i think then u would basically need to calculate ur normal which would have been 0.8g since the block is on the table, then a coefficient would have been added to the question to enable u to calculate frictional force which would act in the opposite direction of the motion of block A. All that would do is reduce the force and hence the acceleration of the block

[@tarekomar54]

If particle A is more than 1 metre from the edge of the table, how is particle B 1 metre above the ground?

[@tarekomar54]

It's little logical concepts like these that prevent me from solving the question bcuz I don't understand them...

[@mustafasiddiqui4161]

What do you mean? How does the distance of A from the edge of the table affect the hieght of B? Youre questions seems irrelevant to me, but maybe I misunderstood it.

[@abcxyz-el5xk]

@@tarekomar54 same

[@abcxyz-el5xk]

@@mustafasiddiqui4161 the distance that A travels is the same as the distance B travels. So we can put this distance into the suvat equation

[@yuegavin9251]

ty

[@ExamSolutions_Maths]

That's ok.

[@abcxyz-el5xk]

Why did you assume that B is 1 meter above the ground so when it travels 1m it hits the ground? It doesn't say that in the question Edit: I know you're right but I would like to understand why.

[@sundus993]

In the question, the 2nd line, first sentence is "which is 1m from the ground"

[@abcxyz-el5xk]

@@sundus993 ty 🙏🏽