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.

A & B

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A, C & D

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C & D

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B,C,D

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Solution

The correct option is D
B,C,D

Friction is not responsible for magnetism even though we can magnetize a non-magnetic substance by rubbing it with a magnet. It is the magnetic field that causes this phenomenon. Friction always opposes relative motion between surfaces. A knife can be sharpened by rubbing it to another irregular surface. Hence, all other options are correct apart from option A.

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Similar questions

Which of these statements describe the correct properties of friction?

A. Rolling friction is always greater than sliding friction.

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.

Which of the following statements are true in the real world scenario?

Statement 1: A uniform motion requires no net force.

Statement 2: In practical situation friction force is always zero.

Statement 3: Friction force acts opposite to the direction of relative motion.

Statement 4: Frictional force can be minimized by using rough surface.

Column I	Column II
a. Sparks are produced when a pair of scissors is sharpened against a grinding wheel.	i. It makes them rough and increases friction.
b. A piece of chalk wears out as it is used	ii. Friction produces heat.
c. Trolleys have wheels.	iii. Friction causes wear and tear.
d. The leather soles of shoes are rubbed on a rough surface.	iv. Powder reduces friction.
e. A surgeon powders his hands before pulling on his plastic gloves.	v. Rolling reduces friction.

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