Question:
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).
Energy spent against friction does not follow the law of conservation of energy.
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).
Energy spent against friction does not follow the law of conservation of energy.
Updated On: Jul 28, 2022
- If both the assertion and reason are true and reason is a correct explanation of the assertion
- If both assertion and reason are true but assertion is not a correct explanation of the assertion
- If the assertion is true but the reason is false
- If both assertion and reason are false
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The Correct Option is D
Solution and Explanation
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.
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Concepts Used:
Work, Energy and Power
Work:
- Work is correlated to force and the displacement over which it acts. When an object is replaced parallel to the force's line of action, it is thought to be doing work. It is a force-driven action that includes movement in the force's direction.
- The work done by the force is described to be the product of the elements of the force in the direction of the displacement and the magnitude of this displacement.
Energy:
- A body's energy is its potential to do tasks. Anything that has the capability to work is said to have energy. The unit of energy is the same as the unit of work, i.e., the Joule.
- There are two types of mechanical energy such as; Kinetic and potential energy.
Read More: Work and Energy
Power:
- Power is the rate at which energy is transferred, conveyed, or converted or the rate of doing work. Technologically, it is the amount of work done per unit of time. The SI unit of power is Watt (W) which is joules per second (J/s). Sometimes the power of motor vehicles and other machines is demonstrated in terms of Horsepower (hp), which is roughly equal to 745.7 watts.
- Power is a scalar quantity, which gives us a quantity or amount of energy consumed per unit of time but with no manifestation of direction.