Which of the following statements is incorrect about friction?

It opposes relative motion between surfaces in contact.

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It produces heat.

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It can stop a moving object.

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It is always disadvantageous.

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Solution

The correct option is D
It is always disadvantageous.

Friction is not always disadvantageous. Many real-life situations require friction. For example, without friction, we can not walk on ground. We can not hold any object or write with a chalk if there was no friction.

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