A 4 kg block on a horizontal surface experiences a vertical normal force of 39.2 N. If the kinetic friction coefficient is μk = 0.4, what is the kinetic frictional force?

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Multiple Choice

A 4 kg block on a horizontal surface experiences a vertical normal force of 39.2 N. If the kinetic friction coefficient is μk = 0.4, what is the kinetic frictional force?

Explanation:
Kinetic friction is proportional to the normal force: f_k = μ_k N. On a horizontal surface the normal force balances the weight, so N is 39.2 N. Multiply by the coefficient: f_k = 0.4 × 39.2 = 15.68 N. This friction acts opposite to the motion.

Kinetic friction is proportional to the normal force: f_k = μ_k N. On a horizontal surface the normal force balances the weight, so N is 39.2 N. Multiply by the coefficient: f_k = 0.4 × 39.2 = 15.68 N. This friction acts opposite to the motion.

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