Question

Okay so one question is this..
http://openstudy.com/study#/updates/50c5f6bee4b0b766106d5c3f
Another one is here..
A block is resting on a disc as shown.A force F is exerted on the block.Assume the mass of both the block and the disc is the same(Mass=m).Assume that the radius of the disc=R.Assume that the static and kinetic friction between the disc and the 2 surfaces are u and u(k).Draw a graph between the force F and the value of the friction at the two surfaces?What is the direction of friction on the disc at the two surfaces?What is the direction on the disc at the two surfaces?What is the maximum possible accleration of the disc?


My question is..why did he take "2a" as the acceleration in THAT question..while in this same kind of question my book just took it as "a..?

Answer 1

Please forgive me, Lord. I would slave for you but please do not show me Physics. Thank you

Answer 2

I didn't show you,that was your own mercy upon me.

Answer 3

@RnR @Mashy @shubhamsrg

Answer 4

Also what is the MoI of a pulley o_O ? disc one? everytime?

Answer 5

this is the diagram to other question

Answer 6

im pretty sure friction act in this manner,not sure :P