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A crate is placed on the bed of a truck but is not tied down. The...

A crate is placed on the bed of a truck but is not tied down. The truck accelerates forward, the crate remains at rest with respect to the bed of the truck. The frictional force acting on the crate is…

kinetic friction acting forward

static friction acting forward

kinetic friction acting backward

static friction acting backward
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Answer #1

Kinetic friction acts when there is relative motion in between the two surfaces which are in contact. In case of static friction there is no such rekative motion. So, static friction acts on the crate.

Since the truck is accelerating in forward direction and there is no sliding of the crate, the crate is moving with the same forward acceleration. This acceleration of the crate is provided by the static friction which acts in forwad direction.

So, Static friction acting forward is correct.

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