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A 50 kg block on the floor. The coefficients of static and kinetic friction are 0.7 and 0.5 respectively. (a) What is the minimum force needed to start the block moving? (b) If the same force continues to push the block after it starts moving, what is the acceleration of the block?
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a)
maximum frictional force while stationary = 50*9.81*0.7 = 343.35 N
Therefore minimum force needed = 340 N (2sf)
b) maximum frictional force while moving = 50*9.81*0.5 = 242.25 N
net horizontal force = 343.35 - 242.25 = 98.1 N
acceleration = 98.1 / 50 = 2.0 m/s² (2sf)