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JAMB Physics 1999 Question 18

Question 18

Friction

When the brakes in a car are applied, the frictional force on the tyres is

  1. A.a disadvantage because it is in the direction of motion of the car
  2. B.a disadvantage because it is in the opposite direction of motion of the car
  3. C.an advantage because it is in the direction of motion of the car
  4. D.an advantage because it is in the opposite direction of motion of the car.
Show the answer and explanation

Answer: D (an advantage because it is in the opposite direction of motion of the car.)

Explanation

Friction acts opposite to the car's motion, and that is what slows the car down, so here it is useful.