Friction Test

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Friction Test - 3

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Weekly Quiz Competition

Question 1
1 / -0

What type of a force is friction?

A
Contact force

B
Non-contact force

C
Electrostatic force

D
Magnetic force

Solution

Frictional force is always between two surfaces in contact with each other.
Question 2
1 / -0

What is the value of sliding friction for an object which requires 7 N of force to move it from rest?

A
7 N

B
Greater than 7 N

C
Less than 7 N

D
14 N

Solution

Sliding friction is less than the friction that builds up before sliding, i.e., static friction. Hence, sliding friction is less than 7 N.
Question 3
1 / -0

Which of the following materials is likely to have the least friction?

A
Wood

B
Cardboard

C
Glass

D
Paper

Solution

Glass has comparatively a better polished and regular surface and so, it has the least friction.
Question 4
1 / -0

Which of the following reduces friction in a rotating machine?

A
Wheels

B
Rollers

C
Ball bearings

D
Handle

Solution

The use of ball bearings causes rolling friction which is much less than the sliding friction.
Question 5
1 / -0

In which of the following cases is friction desirable?

A
Movement of piston in a cylinder

B
A vehicle speeding

C
Running on a track

D
All of the above

Solution

Friction is desirable to stop or reduce speed of a speeding vehicle. When the brakes are applied in a speeding vehicle, they rub against the wheels in motion. Due to the friction between the brakes and wheels, the speed of vehicle is reduced or it may come to stop.
Question 6
1 / -0

Why is a carrom board usually powdered before playing?

A
For increasing friction

B
For decreasing friction

C
For decoration

D
For fragrance

Solution

Powder is a lubricant and reduces friction. Hence, for decreasing friction, carrom board is usually powdered before playing.
Question 7
1 / -0

Which of the following statements is correct?

A
Rolling is easier than sliding.

B
Sliding is easier than rolling.

C
Dragging is easier than sliding.

D
Dragging is easier than rolling.

Solution

Rolling reduces friction. Rolling friction is the least amongst the three kinds of frictions, rolling, sliding and static friction.
Question 8
1 / -0

What is the frictional force exerted by fluids called?

A
Lift

B
Drag

C
Rolling friction

D
Dynamic friction

Solution

The frictional force exerted by fluids is called drag.
Question 9
1 / -0

Why are certain bodies streamlined?

A
To increase friction

B
To decrease weight

C
To reduce friction

D
To increase weight

Solution

A streamlined body reduces drag (friction) during motion.
Question 10
1 / -0

In the decreasing order of magnitude, which of the following is correct?

A
Rolling < static < sliding friction

B
Static > sliding > rolling friction

C
Static > rolling > sliding friction

D
Sliding < static < rolling friction

Solution

For the given surfaces static friction is somewhat greater than sliding friction as well as-rolling friction. It is easier to roll than to slide. Hence, sliding friction is greater than rolling friction. The decreasing order of magnitude of friction is static, sliding and rolling.

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Friction Test - 3

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Friction Test - 3

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SHARING IS CARING

Question 1

Contact force

Non-contact force

Electrostatic force

Magnetic force

Solution

Question 2

7 N

Greater than 7 N

Less than 7 N

14 N

Solution

Question 3

Wood

Cardboard

Glass

Paper

Solution

Question 4

Wheels

Rollers

Ball bearings

Handle

Solution

Question 5

Movement of piston in a cylinder

A vehicle speeding

Running on a track

All of the above

Solution

Question 6

For increasing friction

For decreasing friction

For decoration

For fragrance

Solution

Question 7

Rolling is easier than sliding.

Sliding is easier than rolling.

Dragging is easier than sliding.

Dragging is easier than rolling.

Solution

Question 8

Lift

Drag

Rolling friction

Dynamic friction

Solution

Question 9

To increase friction

To decrease weight

To reduce friction

To increase weight

Solution

Question 10

Rolling < static < sliding friction

Static > sliding > rolling friction

Static > rolling > sliding friction

Sliding < static < rolling friction

Solution

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