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If only an external force can change the...

If only an external force can change the momentum of the centre of mass of an object, how can be internal force of an engine accelerate a car?

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Internal forces can change

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If only an external force can change the state of motion of CM of a body then how does the internal force of the brakes bring bicycle to rest?

To accelerate a car we ignite petrol in the engine of the car. Since only an external force can accelerate the centre of mass, is it proper to sasy that the fore generated by the engine accelerates the car?

PHYSICS GALAXY - ASHISH ARORA-LINEAR MOMENTUM & ITS CONSERVATION-Discussio Q
  1. The shorter the impact time of an impulse, the greater the force must ...

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  2. A man stretches a spring attached to the front wall of railway carriag...

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  3. It is possible for a body to receive a larger impulse from a small for...

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  4. A truck driver carrying chickens to market is stopped at weighing stat...

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  5. A ball dropped onto a hard floor has a downward momentum, and after it...

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  6. A ball is dropped from a height h onto a hard floor, from which it reb...

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  7. Sometimes when extinguishing a fire o a burning ship, a fireboat will ...

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  8. A rocket following a parabolic path through the air suddenly explodes ...

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  9. A gum ball is shot at a block of wood. In which case dows the gum exe...

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  10. If only an external force can change the momentum of the centre of mas...

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  11. It is said that in ancient times a rich man with a bag of gold coins w...

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  12. Discuss the possibility of a particular type of collision ini which th...

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  13. In a collision between two cars, which would you expect to be more dam...

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  14. The velocity of a bullet fired from a rifle held against the chooter's...

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  15. A high jumper successully clears the bar. Is it possibel that his cent...

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  16. Most of the skid mearks left at the scence of an automobile accident a...

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  17. IN a headon collision between two particles, is it necessary that the ...

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  18. In the early age of rocket motion it was assumed by many peope that a ...

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  19. An hourglass with a valve that starts the flow of sand is being weighe...

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  20. Explain on the basis of impulse equation, why it is unwise to hold you...

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