(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

A block of mass m rests on the left edge of a block of length L and mass M. Coefficient of kinetic friction between m and M is u. There is no friction between the bottom block (M) and the floor. A constant horizontal force F is applied to mass m, setting it in motion. How long will it take the block m to make it to the right of the bigger block? How far does the block M move in the process? view attached file for diagram.

2. Relevant equations

F = u R

s = ut + 1/2 at^2

3. The attempt at a solution

Net forfard force on m is = F - fk = F - uR1 = F - umg

Newton's second law: a = (F - umg)/m

s = 0 + 1/2 a t^2

L = 1/2 a t^2

solve for t: =

It was given that L = 3 m, M= 8kg, m = 2kg , u = 0.300 and F = 10 N

t =1.7 s

answer given in the book for t = 2.13 s.

I am missing something. Can you point out what might be wrong? thank you.

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# Homework Help: Friction and relative motion

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