Question

A force acting on an object

• A. can change direction of its velocity.
• B. can change magnitude of its velocity.
• C. must change magnitude of its velocity.
• D. must change direction of its velocity.

Answer 1

Answer: (A), (B)

can change magnitude of its velocity.

Explanation for correct options:

Option A:

1. If the force is a balanced force, then the direction of an object will not change.
2. If the force is an unbalanced force then, by newton's first law of motion the object will change its direction.
3. Hence, a force acting on an object can change the direction of its velocity.

Option B:

1. If the force is a balanced force, then the magnitude of an object will not change.
2. If the force is an unbalanced force then, by newton's first law of motion the object will change its speed.
3. Hence, a force acting on an object can change the magnitude of its velocity.

Explanation for incorrect options:

Option C:

1. It is not necessary that after applying the force on an object, must change the magnitude of its velocity as the applied force may be balanced or unbalanced.

Option D:

1. It is not necessary that after applying the force on an object, must change the direction of its velocity as the applied force may be balanced or unbalanced.

Hence, options A and B are the correct answer.