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Name the three forms of kinetic energy and give one example of each.

Important Questions on Work, Energy and Power

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Science>Physics>Work, Energy and Power>Mechanical Energy and Its Different Forms
A force acting on a 20 kg mass changes its velocity from 6 m/s to 3 m/s. The work done by the force is :
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Science>Physics>Work, Energy and Power>Mechanical Energy and Its Different Forms
A body of mass 10 kg is kept at a height of 5 m. It is allowed to fall and reach the ground. What is the kinetic energy possessed by the body just before hitting the ground? Take g=10 m s-2
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Science>Physics>Work, Energy and Power>Mechanical Energy and Its Different Forms
A body of mass 10 kg is kept at a height of 5 m. It is allowed to fall and reach the ground. What is the total mechanical energy possessed by the body at the height of 2 m assuming it is a frictionless medium? (use g=10 m s-2)
EASY
Science>Physics>Work, Energy and Power>Mechanical Energy and Its Different Forms
 A force increases the speed of body of mass 1.0 kg from 4 m/s to 8 m/s. The work done by force is  _____.

 

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Science>Physics>Work, Energy and Power>Mechanical Energy and Its Different Forms
The work done to increase the velocity of a car from 30 km h-1 to 60 km h-1, if the mass of the car is 1500 kg, is:
EASY
Science>Physics>Work, Energy and Power>Mechanical Energy and Its Different Forms
What are the few steps to be taken to conserve the sources of energy?
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Science>Physics>Work, Energy and Power>Mechanical Energy and Its Different Forms
A bob of mass m is attached to one end of the rod of negligible mass and length r, the other end of which is pivoted freely at a fixed centre Oas shown in the figure. What initial speed must be given to the object to reach the top of the circle?
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HARD
Science>Physics>Work, Energy and Power>Mechanical Energy and Its Different Forms
Explain the law of conservation of energy by giving the example of a body falling from height 'h'.
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Science>Physics>Work, Energy and Power>Mechanical Energy and Its Different Forms
The work done by a body against friction always results in
EASY
Science>Physics>Work, Energy and Power>Mechanical Energy and Its Different Forms

When a spring is compressed and then released the potential energy is converted into kinetic energy.

This is due to law of conservation of _____

EASY
Science>Physics>Work, Energy and Power>Mechanical Energy and Its Different Forms
Give an example of energy degradation.
HARD
Science>Physics>Work, Energy and Power>Mechanical Energy and Its Different Forms
Two electrodes are maintained at a potential difference of 100 V. An electron moving from cathode to anode gains kinetic energy equal to
EASY
Science>Physics>Work, Energy and Power>Mechanical Energy and Its Different Forms
Define Law of conservation of energy.
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Science>Physics>Work, Energy and Power>Mechanical Energy and Its Different Forms
State the principle of conservation of energy. Prove it with the help of vibrating simple pendulum.
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Science>Physics>Work, Energy and Power>Mechanical Energy and Its Different Forms
Give one example of energy degradation.
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Science>Physics>Work, Energy and Power>Mechanical Energy and Its Different Forms

Divya always switched off unwanted lights, fans and electric gadgets when not in use. Comparatively her electricity bill cut down to half:

(c) What values does Divya show?

HARD
Science>Physics>Work, Energy and Power>Mechanical Energy and Its Different Forms

A simple pendulum, while oscillation, rises to a maximum vertical height 5 cm from its rest position when it reaches to one side on its extreme position. If mass of bob of simple pendulum is 500 g and g=10 ms-2, find the velocity of bob at its resting position. State the assumption made in your calculation.

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Science>Physics>Work, Energy and Power>Mechanical Energy and Its Different Forms

What do you mean by degradation of energy ? Explain it by taking one example from your daily life.

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Science>Physics>Work, Energy and Power>Mechanical Energy and Its Different Forms
A pendulum is oscillating on either side of its rest position. The correct statement is:
EASY
Science>Physics>Work, Energy and Power>Mechanical Energy and Its Different Forms
Switching off lights and fans when not in use can save.