Question

(d) The force of friction always acts the motion. (along, against)
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Answer 1

Answer:

The force of friction always acts against the motion.

Explanation:

Force of friction always acts in a direction opposite to the motion of the object. When two bodies are in contact, their relative motion is opposed by a resistance called friction.

Force of friction is force which is exerted on surface by the other and which causes resistance to the motion. It is not a fundamental force like gravity.

When the object is at rest, this means that, not in motion; the friction working on it is called static friction.

When the object starts moving, the friction opposing its motion is called kinetic friction.

Answer 2

Answer:

Explanation:

The force of friction always acts against the motion.

Force of friction is force which is exerted on surface by the other and which causes resistance to the motion. It is not a fundamental force like gravity.

When the object is at rest the friction on it is called static friction.

When the object starts moving, the friction opposing its motion is called kinetic friction.

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