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# Block A weight 4N and B weight 8N . The coefficient of kinetic friction is 0.25 for all surface. Find the force F to slide B weight a constant.speed when A.rests on B and moves with it find the force F to slide B a constant speed when A is held rest and find the force F to.solid.B at a constant speed when A and B are connected by a light cord passing over a.smooth pulley?

Asked by kanakpandeyyy 19th August 2018, 12:26 PM
Figure shows the various forces acting on block-B, when block-A is resting on it.
Applied force F will just balance the frictional force f, in order to pull the block with constant speed.

frictional force f = μR = 0.25×12 = 3 N

hence applied force of magnitude 3N will be able to pull the block-B with constant velocity,
when block-A resting on block-B and moving with block-B
---------------------------
No force is required when block-A and block-B are connected by a light cord and passed over pulley,
because block-B is heavier than block-A.
Answered by Expert 24th August 2018, 3:47 PM
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