Question

Qualitative definition of force is given by

• A. Newton's first law of motion
• B. Newton's second law of motion
• C. Newton's third law of motion
• D. Newton's law of gravitation

Answer 1

The correct option is A

Newton's first law of motion

Explanation for correct option:

A: Newton's first law of motion

1. Newton's first law of motion: It states that “An object at rest will stay at rest and an object in motion will stay in motion with the same speed and direction unless and until an external force is applied to the object.”
2. So according to this, force must push or pull a body in order to move it, this is the qualitative definition of force.

Explanation for incorrect option(s):

B: Newton's second law of motion

1. Newton's second law of motion states that the “Rate of change of momentum is directly proportional to the force applied.” It describes momentum.

C: Newton's third law of motion

1. Newton's third law of motion states that “Every action has an equal and opposite reaction.” It does not describe about the force.

D: Newton's law of gravitation

1. Newton's law of gravitation states that “Everybody attracts another body with a force directly proportional to the product of their masses and inversely proportional to the square of the distance between them.” It describes gravitation.

Thus, option A is the correct option.