1.
A body of mass 2 kg is moving with a speed of 6 m/s. Its kinetic energy is
2.
The work done by gravity on a freely falling body is
3.
A force acts perpendicular to the displacement. The work done is
4.
A body falls from a height h. Ignoring air resistance, just before reaching the ground its kinetic energy is
5.
The work-energy theorem states that
6.
A spring is compressed by x. The potential energy stored is
7.
A machine of power 500 W performs 5000 J of work in
8.
Power developed by a constant force is
9.
Which of the following is a conservative force?
10.
Mechanical energy remains constant when
11.
Assertion (A): The work done by friction is usually negative. Reason (R): Friction acts opposite to the direction of relative motion.
12.
Assertion (A): Power can be high even if the work done is small. Reason (R): Power depends on the rate of doing work.
13.
A force of 50 N moves a body by 8 m in the same direction. The work done is
14.
A body moving with speed v has kinetic energy K. If its speed becomes 3v, its kinetic energy becomes
15.
Match the Columns: Column–I P. Work Q. Power R. Spring Energy S. Kinetic Energy Column–II 1. (1/2)mv² 2. Watt 3. (1/2)kx² 4. Joule
16.
A body is lifted vertically upward through height h. The increase in potential energy is
17.
Which quantity has the same SI unit as work?
18.
A 100 W bulb consumes energy in 10 s equal to
19.
If no external non-conservative force acts on a system, then
20.
Which graph is most useful for calculating work done by a variable force?
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