Friction

Friction is a

• (a) non-contact force

• (b) contact force

• (c) magnetic force

• (d) electrostatic force

Which of the following produces least friction?

• (a) Sliding friction

• (b) Rolling friction

• (c) Composite friction

• (d) Static friction

Friction always

• (a) opposes the motion

• (b) helps the motion

• (c) both (a) and (b)

• (d) none of these

Tags

NGSS.MS-PS2-2

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

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

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