Can kinetic energy of a system be increased or decreased without applying any external force on the system? (Yes/No)

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Solution

Yes, the kinetic energy of a body can be increased or decreased without the application of an external force.
Example: rocket flying in space gains or loses speed by ejecting high speed gases.

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Can the momentum of a isolated system can be change without any external force.?

Q. Assertion :When there is no external force on a system, its kinetic energy must remain constant Reason: When there is no external force on a system its linear momentum must remain constant.

Q. Assertion :No external force acts on a system of two spheres which undergo a perfectly elastic head-on collision. The minimum kinetic energy of this system is zero if the net momentum of the system is zero. Reason: If any two bodies undergo a perfectly elastic head-on collision, at the instant of maximum deformation, the complete kinetic energy of the system is converted to deformation potential energy of the system.

Q. If separation between two-point charges decreases then electric potential energy of the system increases, whatever be the sign of charges. Yes or No?

Potential energy of a system of positive charges arranged like a ring is:

Statement 1: Work done (without providing any Kinetic energy to any charge) by an external force in bringing each charge from infinity to the final configuration i.e. a ring.

Statement 2: Work done (without providing any Kinetic energy to any charge) by an external force in bringing each charge from reference point to the final configuration i.e. a ring.

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Can kinetic energy of a system be increased or decreased without applying any external force on the system? (Yes/No)

Yes, the kinetic energy of a body can be increased or decreased without the application of an external force. Example: rocket flying in space gains or loses speed by ejecting high speed gases.

Yes, the kinetic energy of a body can be increased or decreased without the application of an external force.
Example: rocket flying in space gains or loses speed by ejecting high speed gases.