In the figure below, blocks A and B have weights of 44 N and 21 N, respectively.

Question

In the figure below, blocks A and B have weights of 44 N and 21 N, respectively. The coefficients of friction between A and the table are ?s=0.20 and ?k=0.15.

(a) Determine the minimum weight of block C to keep A from sliding.
?? N
(b) If block C then suddenly is lifted off A, what is size of the acceleration of block A?
?? m/s2

In the figure below, blocks A and B have weights of 44 N and 21 N, respectively. The coefficients of friction between A and the table are ?s=0.20 and ?k=0.15. (a) Determine the minimum weight of block C to keep A from sliding. ?? N (b) If block C then suddenly is lifted off A, what is size of the acceleration of block A? ?? m/s2

Explanation / Answer

friction F = 0.2*(44+C)

gravitational F = 21

equating,

C= 61N.

(b), Tension , T= 44*0.15N

force equation,

ma = mg-T ,

a = 6.726m/s2

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