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Problem 1 - Entrance Test

A block of mass 2 kg is placed on a horizontal surface. The coefficient of static friction between the block and the surface is 0.5. If a horizontal force of 2 N is applied to the block, what is the acceleration of the block?

Correct: A

Since the applied force (2 N) is less than the maximum static frictional force (μs * N = 0.5 * 2 * 9.8 = 9.8 N), the block will not move. So the acceleration of the block is 0 m/s^2.