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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

Previous Year Papers

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Class 10 Class 12
Underline the correct alternative:

(d) In an inelastic collision of two bodies, the quantities which do not change after the collision are the total kinetic energy/total linear momentum/total energy of the system of two bodies. 

Total linear momentum

The total linear momentum always remains conserved, whether it is an elastic collision or an inelastic collision. 
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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 .
799 Views

What is watt?

SI unit of power is Watt. 
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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 watt.

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