Answer and Explanation:
As the truck accelerates towards north, the crate in the back of the pickup truck is accelerated towards south without slipping but the friction force between the bottom of the crate and the surface of truck is along the direction of the truck and thus the direction of truck is north so the fiction force also would be along north.
HELP
As the truck accelerates towards north, the crate will experience a force towards south, thus accelerating it (crate) due south. The force of friction between the crate and truck floor will thus act towards north direction to oppose the motion of the crate.
The friction force on the crate point should be on north position.
Since the truck accelerates towards the north, the crate should experience a force towards the south, due to this accelerating it (crate) because of south. The force of friction that lies between the crate and truck floor will thus act towards the north direction for oppose the motion of the crate.
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