Questions
A varying horizontal force acts on a block of mass m kept on a smooth horizontal surface. An identical block is kept on the first block. The coefficient of friction between the blocks is .The time after which relative sliding between the blocks prevails is
detailed solution
Correct option is B
GivenHorizontal force F=at Coefficient of friction =μ For upper block : fs=maFor lower block : F−fs=maSolving we get,fs=F2Relative sliding starts when fs cross the value fL.∴fs=fL⇒F2=μmg⇒at2=μmg⇒t=2μmgaSimilar Questions
A boy of mass 4 kg is standing on a piece of wood having mass 5 kg. If the coefficient of friction between the wood and the floor is 0.5, the maximum force that the boy can exert on the rope so that the piece of wood does not move from its place is ______ N. (Round off to the Nearest integer)
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