Tips and Tricks on Center of Mass, Impulse and Momentum-Physics-IIT-JEE

4/17/2016

Tips and Tricks on Center of Mass, Impulse and Momentum-Physics-IIT-JEE

Tips and Tricks on Center of Mass, Impulse and Momentum

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 Question Bank

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Elasc collision occurs only in atomic or subatomic parcles. In real world, collision is inelasc. Only collision between two ping‐pong balls may be considered elasc. During elasc collision kinec energy and linear momentum are conserved.

 Videos  Tips & Tricks

Linear momentum is conserved whenever external force is zero or in a two body system net external force is zero.

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 Formulae

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 Recap Test

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Trick: If two parcles have equal mass and collision is oblique elasc then equal masses fly off at right angle to one another.

Collision is one dimensional if the center of mass of the colliding parcles before and aer collision are in same straight line

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Radioacvity is also considered to be a collision process therefore momentum is conserved before and aer emission.


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In oblique elasc collision conserve momentum in x and y direcon separately since kinec energy is scalar, therefore do not take components of kinec energy. However kinec energy is conserved just before and just aer collision.

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Since momentum and energy are treated invariant quanes of moon therefore acon is regarded as impulse or change in momentum and not force. Moreover, it is assumed in an isolated system that there may be exchange of energy and of momentum between different parts but total of each quanty is conserved.

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If the mass of a spaceship moving around a planet varies then do not apply conservaon of momentum to find new speed as the orbital velocity is independent of mass of the Spaceship.


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Tips and Tricks on Center of Mass, Impulse and Momentum-Physics-IIT-JEE

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