A box is kept on a truck and it does not slide. Which of the following is a correct statement?

Static friction is acting along the direction of motion of the truck

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Frictional force is not acting

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Rolling friction is acting along the direction of motion of the truck

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Static friction is acting opposite to the direction of motion of the truck

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Solution

The correct option is A
Static friction is acting along the direction of motion of the truck

When truck moves forward, box tends to move backward due to inertia. But it does not move in that direction because static friction is acting in the opposite direction i.e. along the direction of the motion of truck.

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