Friction and Motion

Friction is a

• (a) non-contact force

• (b) contact force

• (c) magnetic force

• (d) electrostatic force

Friction always

• (a) opposes the motion

• (b) helps the motion

• (c) both (a) and (b)

• (d) none of these

Friction can be reduced by using

• (a) oil

• (b) grease

• (c) powder

• (d) all of these

The shape of an aeroplane is like a

• (a) dog

• (b) bird

• (c) car

• (d) all of these

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Friction due to fluids is called

• (a) force

• (b) pressure

• (c) friction

• (d) drag

Which of the following is not a smooth surface?

• (a) Surface of wet soap

• (b) Surface of tyres

• (c) Glazed tiles

• (d) Surface of mirror

A toy car released with the same initial speed will travel farthest on

• (a) muddy surface

• (b) polished marble surface

• (c) cemented surface

• (d) brick surface

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If we apply oil on door hinges, the friction will

• (a) increase

• (b) decrease

• (c) disappear altogether

• (d) will remain unchanged

Force of friction depends on

• (a) roughness of surface

• (b) smoothness of surface

• (c) inclination of surface

• (d) all of these

Which of the following is responsible for wearing out of bicycle tyres?

• a) Muscular force

• (b) Magnetic force

• (c) Frictional force

• (d) Electrostatic force