Question

Friction is a/an
(A) Self-adjusting force
(B) Necessary evil
(C) An important force in daily life
(D) All of the above

Answer 1

Hint The frictional force is the force between two surfaces in contact that resists their movement of sliding against each other. Frictional forces come into play due to the texture of the surface of the bodies in contact, or the force with which both these bodies are bound to each other.

Complete Step by step solution
There are two types of frictional forces due to the relative motion between the two surfaces. They are static friction and kinetic friction. Static friction is the friction between two surfaces that are in contact, that remains to be in a state of rest relative to each other. Kinetic friction is the friction between two forces that are in contact, which is in a state of motion against each other. In the case of static friction, any movement between the two surfaces will be opposed by the frictional force between the two. This causes the two surfaces to retain its state of rest. So, the frictional force can be considered to be a self-adjusting force.
If there was no friction, then we won’t be able to walk anywhere on any surfaces. So, the frictional force is a necessary evil.
Again, if there was no frictional force, then it would be difficult to hold things or put things on top of a table, expecting them to stay stationary, or riding a bike, driving a car, and doing many other things would be impossible without the force due to friction. Therefore, the frictional force is an important force in daily life.
Therefore, we can conclude that all the mentioned options are correct answers and the

The correct option is (D) All of the above.

Note
While frictional force is an important force for almost everything we do, too much friction is not too good. Excessive friction will cause wear and tear of tyres. Excessive friction will also reduce the efficiency of machines.