Question

An object is sliding across a frictionless floor with a constant velocity of 10m/s. The force required to keep the object moving with the same velocity is
1. Zero force
2. Equal to frictional force
3. Weight of the object
4. 10 N

Answer 1

Correct Answer - Option 1 : Zero force

The correct answer is option 1) i.e. Zero force

CONCEPT:

• Newton's first law of motion: It states that an object at rest remains at rest, or if in motion, remains in motion at a constant velocity unless acted on by a net external force.
  • This means that the object at rest would have a tendency to stay at rest and an object in motion will have a tendency to stay in motion.
  • This law is also known as the law of inertia.

EXPLANATION:

• The floor is frictionless.
• Since there is no external force acting on the object, it will continue to be in its original state of motion based on Newton's first law of motion.
• Hence, zero force is required to keep the object moving with constant velocity.