Basic Physics Question

  • Thread starter MattsVai
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  • #1
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Hi everyone! This is my first post so I thought it appropriate to start with a basic question and not give u guys a hard time :) ehehe

So imagine u have 1 box resting on a larger box. A force is applied to this larger box and the smaller box moves with the larger box without slipage.

My question is, if I were to draw up the FBD, what forces are being applied on the small box apart from Fn and Fg?

Cheers
 

Answers and Replies

  • #2
Well isn't that it?? Apart from a rediculously small amount of drag, which force do you suppose is keeping the small box from sliding off the larger one? that's your hint..
 
  • #3
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Well, I am thinking apart from Fn + Fg there is a friction force keeping that small box stationary on top of the larger box. If that is the case there must be a balancing force because technically the small box is relatively stationary. So this means that we also have the applied force Fa on the small box too?

This results in 4 forces: Fn, Fg, Fa, Ff

Am I on the right track?

o:)
 
  • #4
You are right to think that there is an equal/opposite of the static friction on the small box, but that force acts on the big box.
So, a revised list would be:
Fn,Fg,Fs where Fs=force of static friction
 
  • #5
37
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Makes sense... thanks a bunch :)
 

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