ï»¿ 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:(c) work done by friction on a body sliding down an inclined plane from Physics Work, Energy and Power Class 11 Manipur Board

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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:

(c) work done by friction on a body sliding down an inclined plane

NegativeÂ quantity

The direction of the frictional force is opposite to the direction of motion. Therefore, the work done by the frictional force is negative in this case.
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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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Define watt.

Power is said to be one watt if one joule of work is done in one second.Â
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What is watt?

SI unit of power is Watt.Â
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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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