Work, Energy and Power

Physics Part I

Physics

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The sign of work done by a force on a body is important to understand. State carefully if the following quantities are positive or negative:Â

(a) Work done by a man in lifting a bucket out of a well by means of a rope tied to the bucket.

Positive

In the given case, force and displacement are in the same direction. Hence, the sign of work done is positive. In this case, the work is done on the bucket.Â

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Define the unit joule.

Work done is said to be one joule if one newton of Â force displaces the body through a distance of one meter in the direction of applied Â forceÂ .

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What are different units of energy?

The different units of energy are :

(i) Joule Â Â Â Â Â Â

(ii) Erg

(iii) eV Â Â Â Â Â Â

(iv) KWh

(v) Calorie.

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Is work a scalar or a vector quantity?

Work is dot product of two vectors. i.e.Â .

And dot product is a scalar quantity. Therefore, work is a scalar quantity.Â

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