﻿ 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:(d) work done by an applied force on a body moving on a rough horizontal plane with uniform velocity from Physics Work, Energy and Power Class 11 Manipur Board

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Work, Energy and Power

Physics Part I

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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:

(d) work done by an applied force on a body moving on a rough horizontal plane with uniform velocity

Positive quantity.

In this case, the body is moving on a rough horizontal plane. Frictional force opposes the motion of the body. Therefore, in order to maintain a uniform velocity, a uniform force must be applied to the body. Since the applied force acts in the direction of motion of the body, the work done is positive.
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What are different units of energy?

The different units of energy are :

(i) Joule
(ii) Erg
(iii) eV
(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. .

And dot product is a scalar quantity. Therefore, work is a scalar quantity.
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Define the unit joule.

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

SI unit of power is Watt.
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Define watt.

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