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Which is an example of static friction?

a. pulling a skier behind a boat

b. pushing a box that is at rest

c. braking a car going down a hill

d. driving a car up a hill

Answer :

Answer:

static friction is developed between 2 surfaces in state of rest so i think answer is c.Even though the wheel is in motion, the patch of the tire in contact with the ground is stationary relative to the ground, so it is static rather than kinetic friction.

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