Question

Which is not an example of a contact force?

• A. A freely falling stone
• B. A horse pulling a cart
• C. Cutting vegetables
• D. Pulling a spring

Answer 1

The correct option is A

A freely falling stone

The explanation for the correct option:

A: A freely falling stone

1. Non-contact force: The force which does not make direct contact with a body, but acts through space is called non-contact force or force at a distance.
2. Gravitational force acts on a freely falling stone which is a non-contact force.

The explanation for the incorrect options:

Contact force: Force that makes direct contact with a body or acts through a connector is called contact force.

B: A horse pulling a cart

1. A horse pulling a cart- Physical contact between horse and cart.

C: Cutting vegetables

1. Cutting vegetables- Physical contact between knife and vegetables.

D: Pulling a spring

1. Pulling a spring- Physical contact between hands and spring.

Hence, option A is correct.