Question

41. Which of the following is the best of the following is the best explanation of the advantage and disadvantages of the force of friction?
A. Friction is good because it makes objects move faster, but bad because it wastes energy.
B. Friction is good because it stops things from moving, but bad it makes them stop too quickly
C. Friction is helpful because it helps things move and stop, but bad because it causes things to wear out.
D. Friction is good because it makes things move, but bad because it doesn’t use up energy

Answer 1

C.

Friction is useful because it provides grip (so we can walk, drive, and brakes can stop vehicles) and also helps stop motion when needed. Its main disadvantage is wear and tear (and energy loss as heat) on moving parts.

The other choices are incorrect: A and D wrongly say friction makes things move faster (it opposes motion), and B is a poor description and misses the wear/energy-loss drawback.