Which of the following statements is incorrect?

Friction opposes relative motion of objects.

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Friction produces heat.

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Friction can stop a moving object.

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Friction is never useful

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Friction is never useful

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Solution

The correct option is E
Friction is never useful

As there are many actions where friction plays an important role. You cannot write with a pen if there was no friction. Similarly, we cannot walk if there is no friction. Friction is a necessary evil.

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Similar questions

Q. Frictional force opposes applied force forever such that an object can never move.

"Friction is a force which opposes the relative motion between two objects”.

Q. Assertion :Friction opposes relative motion and therby dissipates power in the form of heat. Reason: Friction is always an undesirable force.

Which of the following is/are true about the frictional force?

1. It acts between all moving objects.

2. It always opposes relative motion between two objects.

3. It is a contact force.

4. It is a non- contact force.

A man sharpens his knife. Which of these statements describes the properties of friction that are in use?
A. Friction helps to induce magnetism
B. Friction acts in the opposite direction of relative motion.
C. Friction causes the surfaces in contact to wear away.
D. Friction produces heat energy.

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Which of the following statements is incorrect?

The correct option is E Friction is never useful As there are many actions where friction plays an important role. You cannot write with a pen if there was no friction. Similarly, we cannot walk if there is no friction. Friction is a necessary evil.

The correct option is E
Friction is never useful

As there are many actions where friction plays an important role. You cannot write with a pen if there was no friction. Similarly, we cannot walk if there is no friction. Friction is a necessary evil.