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Internal forces can change...

Internal forces can change

A

Kinetic energy

B

Mechanical energy

C

Momentum

D

1 and 2

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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 , ENERGY & POWER -C.U.Q
  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 statement 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 projected from ground obliquely. During downward motion, pow...

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  8. The blades of a wind mill sweep out a circle of area A. If wind flows ...

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  9. A pump is used to pump a liquid of density rho continuously through a ...

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  10. A body is moved from rest along a staight line by a machine deliverin...

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  11. A pump motor is used to deliver water at a certain rate from a given p...

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

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

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

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

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

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

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

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