A spinning wheel A is brought in contact with another wheel B, initially at rest. Because of the friction at contact, the second wheel also starts spinning. Which of the following energies of the wheel B increases?
(a) Kinetic
(b) Total
(c) Mechanical
(d) Internal
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Answer:
Answer is 'a'. Kinetic energy.
Explanation:
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When a spinning wheel A is brought in contact with another wheel B initially at rest, the (a) kinetic energy, (b) total energy (c) mechanical energy and (d) internal energy of the wheel B increases.
Explanation:
- This is because, wheel B gains kinetic energy as it starts to spin. Also, we know that the mechanical energy is the sum of kinetic energy and potential energy.
- Therefore, the mechanical energy increases which leads to increase in internal energy.
- Thus, the sum of all the energies called total energy also increases.
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