Question

Which of the following are effects of frictional force?

• A. Wearing out of soles of shoes
• B. A rolling ball coming to a halt
• C. Leaves falling on the Ground
• D. A plastic ruler attracting small bits of papers

Answer 1

Answer: (A), (B)

A rolling ball coming to a halt

The explanation for the correct answer:

Option A:

1. The sole of shoes are worn out due to the effect of friction.
2. The soles of shoes increase the friction between surfaces because it makes the surface of the shoes rough.
3. Friction causes wear and tear of objects and reduces the life of the object.

Option B:

1. A rolling ball stops because the surface on which it rolls resists its motion.
2. A rolling ball stops because of friction.

The explanation for the incorrect answer:

Option C: Leaves falling on the Ground

Gravity attracts it to fall downwards to the center of the earth.

Option D: A plastic ruler attracting small bits of papers

The charged scale attracts the pieces of paper by a non-contact force known as electrostatic force.

Hence, options A and Option B are the correct answer.