Questions
An eraser weighing 2N is pressed against the black board with a force of 5N. The coefficient of friction is 0.4. How much force parallel to the black board is required to slide the eraser upwards
detailed solution
Correct option is C
F1=fs+mg, fs=μF here fs=0.4×5 =2N mg= 2N when it moves up both the forces acts downwards so upward force required =4NTalk to our academic expert!
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A person just holds a block weighing 2kg between his hands & just keeps it from falling down by pressing it with his hands. If the force exerted by each hand horizontally is 50N, the coefficient of friction between the hand & the block is
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