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JEE PHYSICS MCQ: WORK-ENERGY-POWER
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If force is always perpendicular to motion
a) KE remains constant
b) Work done by the force is zero
c) Momentum remains constant
d) Speed remains constant
a) KE remains constant
b) Work done by the force is zero
c) Momentum remains constant
d) Speed remains constant
View answer and explanation
Correct option: A
a, b, d
Option A (a, b, d) is correct because if force is always perpendicular to motion, kinetic energy and speed remain constant, and the work done by the force is zero.
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Reason: Force and displacement are perpendicular to each other. Statement I: Both stretched and compressed springs possess potential energy.
Statement II: Work done against restoring force is stored as potential energy. A bullet of mass moving at a speed hits a ball of mass kept at rest. A small part having mass breaks from the ball and sticks to the bullet. The remaining ball is found to move at a speed in the direction of the bullet. Find the velocity of the bullet after the collision.
Reason: Angular displacement is not an axial vector. A body of mass thrown vertically upwards attains a maximum height . As what height will its kinetic energy be of its initial value? Assertion: Centripetal force does no work.
Reason: Force and displacement are perpendicular to each other. Statement I: Both stretched and compressed springs possess potential energy.
Statement II: Work done against restoring force is stored as potential energy. A bullet of mass moving at a speed hits a ball of mass kept at rest. A small part having mass breaks from the ball and sticks to the bullet. The remaining ball is found to move at a speed in the direction of the bullet. Find the velocity of the bullet after the collision.