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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Study for the Newton's Laws of Motion Test. Engage with multiple choice and interactive questions, each hinting at concepts with detailed explanations. Master the principles and ace your exam!

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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