Question

An object rests on a horizontal frictionless surface. A horizontal force of magnitude F is applied. This force produces an acceleration:

• A. Only if F is greater than the weight of the body
• B. Only if F is increasing
• C. Always
• D. None of the above

Answer 1

The correct option is C

Always

a) Only if F is greater than the weight of the body:

1. If F is greater than the weight of the body, it will produce an acceleration in the body, but it can produce acceleration even if F is lesser than the weight of the body.

This option is wrong.

b) Only if F is increasing:

1. If F is continuously increasing, it will produce an acceleration, but even if it is not continuously increasing it will produce an acceleration.

This option is wrong.

c) Always:

1. A block lying on a frictionless surface has a net force of zero. If an additional force acts on it, it will produce motion, irrespective of the magnitude of force.

This option is correct.

d) None of the above:

This option is wrong.

Therefore, it will always produce acceleration.

Hence, the correct option is Option C.