Which type of friction occurs when objects slide against each other?

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Multiple Choice

Which type of friction occurs when objects slide against each other?

Explanation:
Friction encountered when surfaces slide past one another is kinetic (sliding) friction. It acts opposite the direction of motion and is described by F_k = mu_k * N, with mu_k the coefficient of kinetic friction and N the normal force. This type of friction comes into play once motion has started; before that, static friction resists the initial motion and has a maximum value of F_s,max = mu_s * N. Rolling friction applies when objects roll instead of slide, and viscous friction occurs in fluids due to viscosity. So the sliding-friction scenario is best described by kinetic friction.

Friction encountered when surfaces slide past one another is kinetic (sliding) friction. It acts opposite the direction of motion and is described by F_k = mu_k * N, with mu_k the coefficient of kinetic friction and N the normal force. This type of friction comes into play once motion has started; before that, static friction resists the initial motion and has a maximum value of F_s,max = mu_s * N. Rolling friction applies when objects roll instead of slide, and viscous friction occurs in fluids due to viscosity. So the sliding-friction scenario is best described by kinetic friction.

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