A good amount of useful energy is wasted as heat in various machine parts. Why?

Because of gravity.

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Because of Non-contact forces.

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Because of friction.

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None of the above.

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Solution

The correct option is C
Because of friction.

We know that various parts of the machine are not smooth and due to the friction between them, heat is generated. Hence, a good amount of useful energy is wasted as heat in various parts of the machine.

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A good amount of useful energy is wasted as heat in various machine parts. Why?

The correct option is C Because of friction. We know that various parts of the machine are not smooth and due to the friction between them, heat is generated. Hence, a good amount of useful energy is wasted as heat in various parts of the machine.

The correct option is C
Because of friction.

We know that various parts of the machine are not smooth and due to the friction between them, heat is generated. Hence, a good amount of useful energy is wasted as heat in various parts of the machine.