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JEE PHYSICS MCQ: WORK-ENERGY-POWER
1
Medium
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Analyzing
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Statement-1: A body of mass 5 kg is placed on a moving car
having velocity 4 m/s. The kinetic energy of the block is 40 J in all
frames.
Statement-2: The kinetic energy of a system or body is different
in different frames.
having velocity 4 m/s. The kinetic energy of the block is 40 J in all
frames.
Statement-2: The kinetic energy of a system or body is different
in different frames.
View answer and explanation
Correct option: D
Statement-1 is false, Statement-2 is true.
Option D (Statement-1 is false, Statement-2 is true) is correct because the kinetic energy depends on the frame of reference, and is not 40 J in all frames.
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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.
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.