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# Problem: In general, how does the coefficient of static friction compare to the coefficient of kinetic friction for the same two materialsa. The coefficient of static friction can be less than or equal to the coefficient of kinetic friction. b. The coefficient of static friction is greater than the coefficient of kinetic friction. c. The coefficient of static friction can be greater than or equal to the coefficient of kinetic friction. d. The coefficient of static friction is equal to the coefficient of kinetic friction. e. The coefficient of static friction is less than the coefficient of kinetic friction.

###### FREE Expert Solution

In this problem, we are going to make reference to the expressions for static and kinetic friction.

Static friction:

$\overline{){{\mathbf{f}}}_{\mathbf{s}\mathbf{,}\mathbf{m}\mathbf{a}\mathbf{x}}{\mathbf{=}}{{\mathbf{\mu }}}_{{\mathbf{s}}}{\mathbf{N}}}$

Kinetic friction:

$\overline{){{\mathbf{f}}}_{{\mathbf{k}}}{\mathbf{=}}{{\mathbf{\mu }}}_{{\mathbf{k}}}{\mathbf{N}}}$

Static friction is present when an object is pushed/pulled and does not move. Static friction increases as the pushing/pulling force increases. For a stationary object, the magnitude of static friction is equal to the magnitude of the pulling/pushing force.

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###### Problem Details

In general, how does the coefficient of static friction compare to the coefficient of kinetic friction for the same two materials

a. The coefficient of static friction can be less than or equal to the coefficient of kinetic friction.

b. The coefficient of static friction is greater than the coefficient of kinetic friction.

c. The coefficient of static friction can be greater than or equal to the coefficient of kinetic friction.

d. The coefficient of static friction is equal to the coefficient of kinetic friction.

e. The coefficient of static friction is less than the coefficient of kinetic friction.