Block A in the figure weighs 1.50N and block B weighs 4.50N . The coefficient of

Question

Block A in the figure weighs 1.50N and block B weighs 4.50N . The coefficient of kinetic friction between all surfaces is 0.500.

Part A) Find the magnitude of the horizontal force F? a necessary to drag block B to the left at a constant speed of 4.00cm/s if A  rests on B  and moves with it (figure a).

The answer was 3.00 N

Part B) Find the magnitude of the horizontal force F? b necessary to drag block B to the left at a constant speed of 4.00cm/s if A  is held at rest by a string (figure b).

The answer was 3.75 N

My question then is part C.

Part C) In part (A), what is the friction force on block A?

If you could write out how to solve for it as well I would really appreciate it.

Block A in the figure weighs 1.50N and block B weighs 4.50N . The coefficient of kinetic friction between all surfaces is 0.500. Part A) Find the magnitude of the horizontal force F? a necessary to drag block B to the left at a constant speed of 4.00cm/s if A rests on B and moves with it (figure a). The answer was 3.00 N Part B) Find the magnitude of the horizontal force F? b necessary to drag block B to the left at a constant speed of 4.00cm/s if A is held at rest by a string (figure b). The answer was 3.75 N My question then is part C. Part C) In part (A), what is the friction force on block A?

Explanation / Answer

Part C )

since force on the B is 3 N

the minimum force required for B to slide is = 1.5+4.5)*.5 = 3N

therefore Net force = 0

acceleration = 0

now if consider block A since acceleration is zero

net force on block A = 0

therefore

friction on block A = 0 N

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