Questions
An open knife edge of mass M is dropped from a height I on a wooden floor. If the blade penetrates S into the wood, the average resistance offered by the wood to
the blade is
detailed solution
Correct option is B
Let F be the resistive force of wooden plank. It should oppose the weight of the body.Resultant force opposite to the motion = F - M g,Work done = (F - M g)S = Kinetic energyVelocity of fall =(2gh)∴ (F−Mg)S=12M(2hg)2 or F=MghS+Mg=Mg1+hS.Talk to our academic expert!
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The curved portions are smooth and horizontal surface is rough. The block is released from P. At what distance from A, it will stop (if = 0.8)?
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