A block with a mass of 4 kg is 0.8 m from the end of a horizontal board. The boa

Question

A block with a mass of 4 kg is 0.8 m from the end of a horizontal board. The board is titled until the block just begins to slide. The coefficient of static friction between the block and the board is 0.41. The coefficient of kinetic friction between the block and the board is 0.32. Once the block begins to slide, its acceleration is 0.82 m/s^2. What is the total work done by the a) force of friction on the block as it slid down to the end of the board ? b) normal force on the block as it slid down to the end of the board? (With Explanation please)

Explanation / Answer

a)F=4*0.8*0.82(0.73)= 1.9155; b)zero;

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