Question

Which of the following statement is incorrect regarding friction?
1. It is caused by the interlocking of the irregularities on the surfaces
2. It is caused by the force of adhesion between the surfaces
3. It is a necessary evil
4. It does not cause wastage of energy

Answer 1

Correct Answer - Option 4 : It does not cause wastage of energy

The correct answer is It does not cause wastage of energy.

• Friction is the force that resists the relative motion of solid surfaces, fluid layers, and material elements sliding against each other.

• Friction always works in the opposite direction in which the object is moving or trying to move.
• Friction is caused by the interlocking of irregularities in the surface of two objects which are in contact with each other. 
• In order to move one object over the other, a force is applied to overcome the interlocking of the irregularities in their surfaces.
• Friction is a force that resists the relative motion between two objects or materials.
• Friction causes an adequate loss of energy in the form of heat, sound, and light.
• Friction is a necessary evil because it can be harmful to us like fire accidents, wear, and tear.