Question

A person applies a constant force $\overline{F}$ on the particle of the mass $m$ and finds that the particle moves in a circle of radius $r$ with a uniform speed $v$ as seen from an inertial frame of reference. Mark the true statements from the following.

• A. This is not possible.
• B. There are no other forces on the particle.
• C. The resultant of the other force is $\frac{m{v}^2}{r}$ towards the centre.
• D. The resultant of the other force varies in magnitude as well as in direction.

Answer 1

The correct option is D The resultant of the other force varies in magnitude as well as in direction.

Answer is only (D).

As, the $\overline{F}$ is constant so, its magnitude and direction are also constant. Thus to make the particle move in a circle with uniform speed some other forces with varying magnitude and direction are required.