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Internal forces can change...

Internal forces can change

A

Kinetic energy

B

mechanical energy

C

Momentum

D

1 and 2

Text Solution

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The correct Answer is:
D
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Choose the correct statement regarding a system of particles. Internal forces can change the kinetic energy of the system without changing system's momentum O Impulse can be defined as a very large force that acts for a very short time and causes finite change in momentum. Internal forces can change the potential energy of the system without changing system's momentum Internal forces can change the mechanical energy of the system without changing system's momentum.

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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Explain with an example force can change the speed of an object. How does second law of newton supports it?

Internal forces acting in a system of particle can change

Internal forces acting in a system of particle can change

NARAYNA-WORK POWER AND ENERGY-C.U.Q-Key
  1. If 'E' represents total mechanical energy of a system while 'U' repres...

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  2. For a body thrown vertically upwards, its direction of motion changes ...

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  3. Internal forces can change

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  4. The negative of the work done by the conserative internal forces on a ...

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  5. Which of the following statements is wrong ?

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  6. When a body falls from an aeroplane there is increase in its :

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  7. A body is moved along a straight line by a machine delivering constant...

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  8. A particle is projected at t = 0 from a point on the ground with cert...

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  9. A body starts from rest and acquires velocity V in time T. The instant...

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  10. A car drives along a straight level frictionless road by an engine del...

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  11. A particle is projeced with a velocity u making an angle theta with th...

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  12. A motor car of m travels with a uniform speed v on a convex bridge of...

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  13. A gramphone record is revolving with an angular velocity omega. A coin...

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  14. A small sphere of mass 'm' is attached to a cord and rotates in a vert...

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  15. A car is moving up with uniform speed along a fly over bridge which is...

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  16. A bottle of soda water is rotated in a vertical circle with the neck h...

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  17. A vehicle is moving with uniform speed along horizontal, concave and c...

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  18. A ball with initial momentum vec P collides with rigid wall elasticall...

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  19. Choose tha false statement

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  20. Two particles of different masses collide head on. Then for the system

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