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Work, Energy and Power

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Physics Part I

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Physics

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CBSE Gujarat Board Haryana Board

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Class 10 Class 12
Underline the correct alternative:
(b) Work done by a body against friction always results in a loss of its kinetic/potential energy.

Kinetic energy

The work done against the direction of friction reduces the velocity of a body. Hence, the body loses an amount of Kinetic energy. 
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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.

804 Views

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 .
799 Views

Is work a scalar or a vector quantity?

Work is dot product of two vectors. i.e. F with rightwards arrow on top times S with rightwards arrow on top.

And dot product is a scalar quantity. Therefore, work is a scalar quantity. 
1450 Views

Define watt.

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

What is watt?

SI unit of power is Watt. 
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