Question

Friction can be reduced by ___________ .

• A. Using ball bearings
• B. Polishing
• C. Streamlining
• D. All of them

Answer 1

The correct option is D

All of them

The correct option is: (D)

Explanation of the correct option:

Friction is the force resisting the relative motion of solid surfaces, fluid layers, and material elements sliding against each other.

Option (A)

Ball bearings help to rotate the wheel by using its axle.

Option (B)

Polishing helps to fill the small pores of the rough surface and make it smooth.

Option (C)

Streamlining is a form of shape that is given to objects which easily cut the air friction as well as water friction.

All the options (A, B, and C) are correct.

Hence, (D) is the correct option.