Questions
An open knife edge of mass M is dropped from a height 'h' on a wooden floor. If the blade penetrates a distance 's' into the wood, the average resistance offered by the wood to the blade is :
detailed solution
Correct option is B
When the front end of the knife arrives at A, its kinetic energy . During the course of penetration net vertically downward force acting on the knife = (Mg - R).By work energy theoremTalk 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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