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JEE PHYSICS MCQ: WORK-ENERGY-POWER
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Statement I: For the stable equilibrium force has to be zero and potential energy should be minimum.
Statement II: For the equilibrium it is not necessary that the force is not zero.
Statement II: For the equilibrium it is not necessary that the force is not zero.
View answer and explanation
Correct option: C
If Statement - I is true but Statement - II is false
Option C (If Statement - I is true but Statement - II is false) is correct because stable equilibrium requires zero net force and minimum potential energy, making statement II incorrect.
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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.