<em>The force that always acts opposite to the direction of motion of the body is the </em><u><em>friction</em></u><em>.
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Further Explanation:
The force applied on a body is a pull or push which makes a body to change its state of rest or motion. <u>When a body moves on a surface under the action of a force, the body accelerates along the floor</u>.
If the body is moving on a rough floor, then there will be a <u>friction force between the surface and the body and this friction force tends to oppose the motion of the body</u>. The friction force is always acting in the direction opposite to the motion of the body.
<u>The normal force is a force which acts as a reaction force of the surface acting on the body due to the action of the force exerted by the body on the surface</u>. The friction force is always perpendicular to the surface on which the body is placed and therefore, it is termed as the normal force.
<u>The weight of a body is the force by which the body is attracted towards the Earth by the gravitational force of the Earth</u>. The weight of the body is always directed towards the center of the Earth.
Thus, <em>the force that always acts opposite to the direction of motion of the body is the </em><u><em>friction</em></u><em>.
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Answer Details:
Grade: Middle School
Subject: Physics
Chapter: Newton’s law of Motion
Keywords:
Force, opposite to, direction of motion, car, moving forward, force would act, in backward direction, applied, friction, oppose the motion, weight, normal.