Work, Energy and Power

Physics Part I

Physics

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(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.Â

Total linear momentum

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

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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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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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