Part A Block A in the figure (Figure 1) weighs 1.26 N and block B weighs 3.59 N.

Question

Part A Block A in the figure (Figure 1) weighs 1.26 N and block B weighs 3.59 N. The coefficient of kinetic friction between all surfaces is 0.310 Find the magnitude of the horizontal force F necessary to drag block B to the left at constant speed if A rests on B and moves with it (figure F- Value Units Submit My Answers Give Up Part B Find the magnitude of the horizontal force F necessary to drag block B to the left at constant speed if A is held at rest (figure (b)) Figure 1 of 1 F- Value Units Submit My Answers Give Up Continue

Explanation / Answer

a) For the first case,

F= friction acting on both the block together since there is no slipping

F= mu*(M+m)g =0.31*(1.26+3.59) = 1.51 N (ans)

b) in second case,

Friction at A will also come in picture

F= mu*(M+2m)*g = 0.31*(2.52+3.59) = 1.89 N (ans)

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