AIIMS 2002
- Exam
- AIIMS
- Year
- 2002
- Subject
- Physics
- Chapter
- Center of Mass, Momentum and Collision
AIIMS 2002 · Physics · Center of Mass, Momentum and Collision
Assertion : In an elastic collision of two billiard balls, the...
Assertion : In an elastic collision of two billiard balls, the total kinetic energy is conserved during the short time of oscillation of the balls (i.e. when they are in contact).
Reason : Energy spent against friction does not follow the law of conservation of energy.
Options
- AIf both the assertion and reason are true and reason is a correct explanation of the assertion.
- BIf both assertion and reason are true but assertion is not a correct explanation of the assertion.
- CIf the assertion is true but the reason is false.
- DIf both assertion and reason are false.
Correct answer
D. If both assertion and reason are false.
Step-by-step solution
The billiard balls in an elastic collision are in a deformed state. And their total energy is in the form of P.E. and K.E. Thus K.E. is less than the total energy. The energy spent against friction is dissipated in the form of heat which is not available for doing work.