When can you say that the work done is e...

When can you say that the work done is either positive, negative or zero?

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The work done is zero if there is no …….

Answer the following questions: State the condition under which the work done is (i) positive (ii) negative(iii) zero. Why is the work done on an object moving with uniform circular motion zero?

From the following activities find out whether work is positive, negative or zero. Give reasons for your answers: Catching the ball which you friend has thrown towards you

From the following activities find out whether work is positive, negative or zero. Give reasons for your answers: Stopping a moving car by applying brakes.

From the following activities find out whether work is positive, negative or zero. Give reasons for your answers: A coolie is standing with a load on his head.

From the following activities find out whether work is positive, negative or zero. Give reasons for your answers: A boy is swimming in a pond.

Answer the following questions: In the following case, state giving reasons whether the work done is positive or negative: Phenomenon: A ripe fruit falling from a tree. Force: Gravitational force of the earth.

Answer the following questions: In the following case, state giving reasons whether the work done is positive or negative: Activity: A boy goes from the first floor to the third floor with his school bag. Force: The force applied by the boy.

In cyclic processes, when is the work done positive or negative?

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CHETANA PUBLICATION-WORK AND ENERGY-EXERCISE

When can you say that the work done is either positive, negative or ze...
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Forces are of …..…… types
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Fill in the blanks with appropriate words and writw the completed stat...
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S.I. unit of energy is….
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…………..is the capacity to do work.
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Name the following SI unit of energy
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Name the following The relationship between 1 joule and 1erg .
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State whether the following statements are true or false: Power is a ...
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State whtether the following statement are true or false. Water stored...
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Wind can move the blades of a windmill
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A stretched rubber band when released regainsits original length
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An exploding fire cracker lights as well as makes a sound.
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Solve the following examples: Ravi applied a force of 10 N and moved ...
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500 kg water isstored in the overhead tank of a 10 m high building.Cal...
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1 kg mass has a kinetic energy of 2 joule. Calculate its velocity
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Derive an expression for potential energy.
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A 25 W electric bulb is used for 10 hours every day. How much electric...
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If a TV of rating 100 W is operated for 6 hrs per day,find the number ...
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Solve the following examples: If a 1200 W electric iron is used daily...
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Answer the following questions: Derive the formula for the kinetic en...
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State the expression for work done when displacement and force makes a...
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