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JEE PHYSICS MCQ: WORK-ENERGY-POWER
1
Medium
1 of 1
Understanding
+4 | -1
If a motorcyclist skids and stops after
covering a distance of 15 m. The stopping
force acting on the motorcycle by the road is
100 N, then the work done by the motorcycle
on the road is
covering a distance of 15 m. The stopping
force acting on the motorcycle by the road is
100 N, then the work done by the motorcycle
on the road is
View answer and explanation
Correct option: D
Zero
Option D is correct because the road does not undergo any displacement, so no work is done by the motorcycle on the road.
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Assertion:When a particle moves in a circle with a uniform speed its acceleration is constant but the velocity changes.
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.