Question: A large crate is placed on the bed of a truck but not tied down. (a) As the truck accelerates forward, the crate remains at

A large crate is placed on the bed of a truck but not tied down.
(a) As the truck accelerates forward, the crate remains at rest relative to the truck. What force causes the crate to accelerate forward?
(b) If the driver slammed on the brakes, what could happen to the crate?

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