A particle is acted upon by a force of constant magnitude which is… | JEE Main 2004 (AIEEE)

Q23JEE Main 2004 · AIEEEEasy

Work by a Constant Force

A particle is acted upon by a force of constant magnitude which is always perpendicular to the velocity of the particle, the motion of the particles takes place in a plane. It follows that

Show answer and solution

Answer: (a)

A force always perpendicular to velocity does zero work: $P = \vec{F}\cdot\vec{v} = 0$ .
By the work-energy theorem, KE (and speed) stays constant.
The force changes direction, so acceleration and velocity are not constant and the path is a circle, not a straight line.
So the answer is (a) its kinetic energy is constant.

Report a mistake

More questions on Work by a Constant Force

A body moves a distance of 10 m along a straight line under the action of a 5 N force. If…NEET 1997 (AIPMT)
When a body moves with a constant speed along a circleNEET 1994 (AIPMT)
A particle moves from position 3i + 2j - 6k to 14i + 13j + 9k due to uniform force of (4i…MHT CET 2026 (13 May, Shift 1)
A 1 kg block subjected to two simultaneous forces (2i + 3j + 4k) N and (3i - j - 2k) N is…JEE Main 2026 (4 Apr, Shift 1)
A mass of 1 kg is kept on an inclined plane with 30° inclination with respect to…JEE Main 2026 (5 Apr, Shift 2)
A particle is displaced from point P(3 m, 4 m, 5 m) to a point Q(2 m, 3 m, 4 m) under a…MHT CET 2025 (23 Apr, Shift 2)
A force F = 2i + bj + k is applied on a particle and it undergoes a displacement i - 2j -…JEE Main 2025 (22 Jan, Shift 2)
A block of mass 25 kg is pulled along a horizontal surface by a force at an angle 45°…JEE Main 2025 (4 Apr, Shift 2)

Work by a Constant Force question from JEE Main 2004 (AIEEE)

More questions on Work by a Constant Force