Arrow 4 correctly indicates the direction of friction acting on the box.
What is the friction force?
It is a type of opposition force acting on the surface of the body that tries to oppose the motion of the body. its unit is Newton (N).
Mathematically it is defined as the product of the coefficient of friction and normal reaction.
On resolving the given force and accelertaion in the different components and balancing the equation gets.
Friction is a force that resists motion. Because the only force acting on the box is its own weight, we may conclude it is moving downhill. As the force approach the downhill the friction force is acting opposite to it.
Hence, arrow 4 correctly indicates the direction of friction acting on the box.
To learn more about the friction force refer to the link;
https://brainly.com/question/1714663
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