What is a disadvantage of friction?
Show answer & explanation
Correct answer: D
Explanation
- Friction is the force that opposes motion between two surfaces.
- Although friction is useful in many situations, it also has certain disadvantages.
- Due to friction, the surfaces of objects gradually begin to wear away.
- This wear is particularly evident in machine parts.
- Consequently, a portion of energy is also lost in the form of heat.
- As a result, the efficiency of machines may decrease.
- Thus, a major disadvantage of friction is that it causes materials to wear out.