Blocks on a tabletop attached to a mass suspended by a pulley

AI Thread Summary
The discussion centers on a physics problem involving blocks on a tabletop and a mass suspended by a pulley. The key equations mentioned include Newton's second law (f=ma) and the gravitational constant (g=9.8 m/s²). The user is attempting to determine the mass of block C, which must be sufficient to move block A without exceeding the static friction between blocks A and B. They suggest calculating static friction using the coefficient of static friction and the normal force, which they believe is the combined weight of blocks A and B. The user concludes with a calculated mass of 3.75 kg for block C.
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Homework Statement


PhysicsPRoblem.jpg



Homework Equations



We have yet to go over this material, which kinda pisses me off, but I'm guessing that:

f=ma, w=ma, g = 9.8m/s/s

are important

The Attempt at a Solution



If somebody could point me in the right direction that would be very helpful. I attempted at drawing a diagram of the forces on each object, but I'm not sure where to even start.
 
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You want to find the mass of block C so that it moves block A but not too large that it overcomes the static friction between block A and block B I believe. So find the static friction and divide it by g to find the mass of Block C

static friction = (coefficient of static friction) (reaction/normal force)
 
So will the normal force be the mass of the two blocks times gravity?
 
the normal force should be equal to the weight of Block B
 
Thank you so much

I got 3.75 kg
 

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