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Category: Class 9

Look at the activities listed below. Reason out whether or not work is done in the light of your understanding of the term ‘work’. • Suma is swimming in a pond. • A donkey is carrying a load on its back. • A wind-mill is lifting water from a well. • A green plant is carrying out photosynthesis. • An engine is pulling a train. • Food grains are getting dried in the sun. • A sailboat is moving due to wind energy.

Class 9 Physics
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Define average power?

Class 9 Physics
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A lamp consumes 1000 J of electrical energy in 10 s. What is its power?

Class 9 Physics
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Define 1 watt of power?

Class 9 Physics
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What is power?

Class 9 Physics
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The kinetic energy of an object of mass, m moving with a velocity of 5 m s–1 is 25 J. What will be its kinetic energy when its velocity is doubled? What will be its kinetic energy when its velocity is increased three times?

Class 9 Physics
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Write an expression for the kinetic energy of an object.

Class 9 Physics
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What is the kinetic energy of an object?

Class 9 Physics
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A pair of bullocks exerts a force of 140 N on a plough. The field being ploughed is 15 m long. How much work is done in ploughing the length of the field?

Class 9 Physics
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Define 1 J of work?

Class 9 Physics
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Write an expression for the work done when a force is acting on an object in the direction of its displacement.

Class 9 Physics
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When do we say that work is done?

Class 9 Physics
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