Question

Write T for the true statement and F for the false one. Correct the false statement(s).
1. A force can change the shape or size of an object.
2. Gravitational force is a contact force.
3. When we lift a weight in our hands, the force required is provided by the tension of our muscles.
4. Friction is a non-contact force.
5. Wear and tear in machine parts can save fuel and energy.

Answer 1

1. The given statement is true

A force can change the shape or size of an object.

2. The given statement is false

Gravitational force is a non-contact force because it acts without any contact.

3. The given statement is true

When we lift a weight in our hands, the force required is provided by the tension of our muscles.

4. The given statement is false

The friction is a contact force because it only acts when two bodies are in contact.

5. The given statement is false

Reducing friction can save energy and fuel, while wearing and tear increases energy loss.