MEDIUM
JEE Main
IMPORTANT
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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 particle takes place in a plane. It follows that

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Important Questions on Work and Energy

HARD
JEE Main
IMPORTANT
CONCEPTS OF PHYSICS [VOLUME 1]>Chapter 8 - Work and Energy>OBJECTIVE II>Q 4
Consider two observers moving with respect to each other at a speed v along a straight line. They observe a block of mass m moving a distance l on a rough surface. Which among the following quantities will be the same as observed by the two observers?
MEDIUM
JEE Main
IMPORTANT
CONCEPTS OF PHYSICS [VOLUME 1]>Chapter 8 - Work and Energy>OBJECTIVE II>Q 5
You lift a suitcase from the floor and keep it on a table. The work done by you on the suitcase does not depend on
HARD
JEE Main
IMPORTANT
CONCEPTS OF PHYSICS [VOLUME 1]>Chapter 8 - Work and Energy>OBJECTIVE II>Q 6
No work is done by a force on an object if
HARD
JEE Main
IMPORTANT
CONCEPTS OF PHYSICS [VOLUME 1]>Chapter 8 - Work and Energy>OBJECTIVE II>Q 7
A particle of mass m is attached to a light string of length l, the other end of which is fixed. Initially, the string is kept horizontal and the particle is given an upward velocity v. The particle is just able to complete a circle. Then,
HARD
JEE Main
IMPORTANT
CONCEPTS OF PHYSICS [VOLUME 1]>Chapter 8 - Work and Energy>OBJECTIVE II>Q 8
The kinetic energy of a particle continuously increases with time. Then
EASY
JEE Main
IMPORTANT
CONCEPTS OF PHYSICS [VOLUME 1]>Chapter 8 - Work and Energy>OBJECTIVE II>Q 9
One end of a light spring of spring constant k, is fixed to a wall and the other end is tied to a block placed on a smooth horizontal surface. In a displacement, the work done by the spring is 12kx2. The possible cases are
HARD
JEE Main
IMPORTANT
CONCEPTS OF PHYSICS [VOLUME 1]>Chapter 8 - Work and Energy>OBJECTIVE II>Q 10
A block of mass M is hanging over a smooth and light pulley through a light string. The other end of the string is pulled by a constant force F. The kinetic energy of the block increases by 20 J in 1 s.
MEDIUM
JEE Main
IMPORTANT
CONCEPTS OF PHYSICS [VOLUME 1]>Chapter 8 - Work and Energy>EXERCISES>Q 1

The mass of a cyclist together with the bike is 90 kg. Calculate the increase in kinetic energyin J if the speed increases from 6 km h-1 to 12 km h-1.