1.
Work done by a constant force is given by
2.
The SI unit of work is
4.
When the angle between force and displacement is 90⁰, the work done is
5.
The work done by gravitational force during horizontal motion is
6.
The SI unit of power is
7.
The kinetic energy of a body of mass m moving with velocity v is
8.
Potential energy due to gravity is
9.
The SI unit of energy is
11.
A force of 10 N moves a body by 5 m in its direction. The work done is
12.
A 2 kg body moves with speed 4 m/s. Its kinetic energy is
13.
The work done by friction is generally
14.
If the speed of a body is doubled, its kinetic energy becomes
15.
The law of conservation of mechanical energy is valid when
16.
Assertion (A): Work done can be negative. Reason (R): When force acts opposite to displacement, work becomes negative.
17.
Assertion (A): Energy can neither be created nor destroyed. Reason (R): It only transforms from one form to another.
18.
Match the Columns: Column–I P. Work Q. Power R. Kinetic Energy S. Potential Energy Column–II 1. mgh 2. Joule 3. (1/2)mv² 4. Watt
19.
A machine of efficiency 100% converts
20.
A body falls freely from height h. Just before reaching the ground, its potential energy is
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