EASY

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Which conversion of energy occurs when an object falls from a height?

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Important Questions on Work, Energy and Power

EASY

Science>Physics>Work, Energy and Power>Energy

In a simple Pendulum the displacement is equal to amplitude. Then kinetic energy will be

MEDIUM

Science>Physics>Work, Energy and Power>Energy

Name a machine that converts electrical energy into mechanical energy.

EASY

Science>Physics>Work, Energy and Power>Energy

The temperature of the water at the bottom of a water fall is higher than that of the water at the top, because :

HARD

Science>Physics>Work, Energy and Power>Energy

A spring of spring constant $K = 4 x 10^{3} N / m$ is compressed by $2 cm$ , then determine the potential energy stored in spring.

EASY

Science>Physics>Work, Energy and Power>Energy

An electric motor converts:

MEDIUM

Science>Physics>Work, Energy and Power>Energy

Two bodies A and B have masses in the ratio

5 : 1

and their kinetic energies are in the ratio

125 : 9

. Find the ratio of their velocities.

EASY

Science>Physics>Work, Energy and Power>Energy

Describe in your words the law of conservation of energy.

HARD

Science>Physics>Work, Energy and Power>Energy

A block of

9 kg

is moving with a velocity of

4 m / s

on a frictionless surface. The block comes to rest by compressing the spring. If the spring constant is

4 x 10^{4} N / kg

, then find the compression in the spring.

HARD

Science>Physics>Work, Energy and Power>Energy

Name the device that converts electrical energy into mechanical energy. Draw its diagram and label the parts.

EASY

Science>Physics>Work, Energy and Power>Energy

Which device is used to convert mechanical energy into electrical energy? Draw a neat diagram and label the parts of this device.

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Science>Physics>Work, Energy and Power>Energy

State an example of renewable resource.

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Science>Physics>Work, Energy and Power>Energy

State the energy changes in the case of a ceiling fan while in use.

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Science>Physics>Work, Energy and Power>Energy

Write in your words the definition of potential energy.

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Science>Physics>Work, Energy and Power>Energy

A marble P of mass m lies at rest on the edge of a perfectly horizontal surface of a table of height h, as shown in the figure. A second identical marble Q having same mass moving at a speed u strikes it perfectly elastically. The speed acquired by marble P after the collision is (In an elastic collision, momentum as well as kinetic energy are conserved)
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