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When a person walks on a rough surface, the frictional force exerted by the surface on the person is opposite to the direction of his motion.
A. True
B. False

Answer
VerifiedVerified
473.1k+ views
Hint: Think of all the forces acting on the man while he is moving. Now recall the definition of frictional force. We know that it opposes the relative motion, so, in order for it to oppose the relative motion between the man and the rough surface, which direction should the force act.

Complete answer:
In the question, we are given a person who walks on a rough surface. When this person walks, there exists frictional force acting on the person exerted by the surface. We are given a statement that the direction of this frictional force is opposite to the direction of man’s motion. We are asked to find whether the given statement is true or false.
To answer this question, let us recall what frictional force actually is. It is that force that resists the relative motion of two surfaces of an object in contact. So in order to oppose the motion of an object, the frictional force should obviously be acting in the opposite direction to the motion of the motion. Therefore, the given statement, ‘When a person walks on a rough surface, the frictional force exerted by the surface on the person is opposite to the direction of his motion’ is true.

So, the correct answer is “Option A”.

Additional Information:
There are few factors that affects this frictional force, they are:
(1) The angle and position of the object.
(2) The surface texture and the amount of force impelling them together.
(3) The value of frictional force is equal to the weight of the body when it is placed fat against an object.
(4) When an object is pushed against some surface, the value of frictional force increases and becomes greater than the weight of the object.

Note:
There are different types of friction. They are: static friction, kinetic friction, rolling friction and kinetic friction. There are advantages as well as disadvantages to this force. This force reduces the mechanical advantage of machines, that is, ratio of output to input is reduced, at the same time this force is responsible for cars staying on the road.