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CBSE Class 8 Science Question 2 of 10

Friction — Question 2

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Question 2

Four children were asked to arrange forces due to rolling, static and sliding frictions in a decreasing order. Their arrangements are given below. Choose the correct arrangement.

  1. rolling, static, sliding
  2. rolling, sliding, static
  3. static, sliding, rolling
  4. sliding, static, rolling
Answer

static, sliding, rolling

Reason —

  • Static friction is usually the highest among the three types because it's the force required to overcome the initial inertia and get an object moving from rest.

  • Once the object is in motion, the contact points on the object do not get enough time to lock into the contact points of the other surface. So, the sliding friction is slightly smaller than the static friction.

  • Rolling friction is least as rolling motion reduces the contact area between the object and the surface, thus reducing the friction. Hence, the decreasing order of friction is static > sliding > rolling.