Question

The body will move only when the force of friction

• A. Is equal to the applied force
• B. Is less than the applied force
• C. Is greater than the applied force
• D. Is zero

Answer 1

The correct option is B

Is less than the applied force

Frictional force:

It refers to the force generated by two surfaces that contact and slide against each other.

Explanation for correct option:

Option B: Is less than the applied force.

1. The body moves only when an external force is applied to it.
2. It stops when the frictional force acts on the object in the opposite direction.
3. The frictional force is the force applied by the surface to resist the motion relative to it.
4. The body will be able to move only if the frictional force is less than the applied force
5. Hence, option B is correct.

Explanation for Incorrect Option(s):

Option A: Is equal to the applied force

1. If both forces are equal, then the object is at rest as the net force is zero.
2. Hence, option A is incorrect.

Option C: Is greater than the applied force

1. If friction is greater than the applied force, the object cannot be moved as the resist by the frictional force is high which opposes the motion.
2. Hence, option C is incorrect.

Option D: Is zero

1. The body will move if the force of friction is zero, but the body also moves when the force of friction is greater than zero and less than the applied force.
2. Hence, option D is incorrect

Thus, option B is the correct answer.