Friction Test

Result

Friction Test - 28

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Weekly Quiz Competition

Question 1
1 / -0

Tick the most appropriate answer:
A car skids on a wet or muddy road due to

A
Increased friction between the road and the tyres

B
Lubrication of brakes on a wet road

C
Reduced friction between the road and the tyres

D
Streamlined shape of the car

Solution

When the road is wet or muddy, water covers the surface. The coefficient of friction of water is much lesser than that of the road's surface. These will cause the friction to be reduced between the road and the tyres and will lead to the car to skid.
The correct answer is therefore, option (C) .
Question 2
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When walking on ice, one should take small steps to avoid slipping. Smaller steps help avoid slipping because they result in:

A
Larger friction with the ice.

B
Smaller friction with the ice.

C
A larger normal force.

D
A smaller normal force.

Solution
Question 3
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Which of the following is not an example of force acting at a distance ?

A
Force of gravity

B
Magnetic force

C
Electric force

D
Frictional force

Solution

Forces acting at a distance are the forces that result even when the two interacting objects are not in physical contact with each other, yet are able to exert a push or a pull force on each other. Force of gravity, magnetic and electric force are the examples of forces acting at a distance.

Hence, the correct option is D.
Question 4
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When two surfaces are coated with a lubricant, then they.

A
Stick to each other

B
Slide upon each other

C
Roll upon each other

D
None of these

Solution

If two surfaces are coated with lubricant then friction will be reduced so they can slide over each other if one is pushed on the other. It is friction which prevents relative motion between two surfaces.
Question 5
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Which one of the following is not used to reduce friction.

A
Oil

B
Ball bearings

C
Sand

D
Graphite

Solution

Sand is not used to reduce frriction because it is a not smooth instead it is rough which can increase the friction.
Question 6
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Which substance cannot be used to reduce friction?

A
Oil

B
Grease

C
Gum

D
Graphite

Solution

Gum cannot be used to reduce friction.
Question 7
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Why are vehicle tires treaded?

A
To increase friction.

B
To decrease friction.

C
To multiply friction.

D
To decrease grip.

Solution

Friction opposes the relative motion between two surfaces in contact. It acts on both surfaces. Friction depends on the nature of surfaces in contact. For a given pair of surfaces, friction depends upon the state of smoothness of those surfaces. Vehicles tires treaded to increase friction.
Question 8
1 / -0

Frictional force between two surface in contact is due the

A
Adhesive force between the molecules

B
Cohesive force between the molecules

C
Repulsive forces between the molecules

D
Both $$2$$ and $$3$$

Solution
Question 9
1 / -0

Galileo did his experiments on inclined planes with smooth surfaces and observed that

A
As smoother the surface, the farther the ball traveled

B
As rough the surface, the farther the ball traveled

C
As smoother the surface, the nearer the ball traveled

D
None of these
Question 10
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The interlocking of the depressions and elevations (irregularities) present on the surfaces of the bodies in contact cause friction.

A
True

B
False

C
Ambiguous

D
Data Insufficient

Solution

The interlocking of two surfaces opposes or hinders or resists the relative motion between the two surfaces. This resisting force that acts in the opposite direction of the movement is called the force of friction. Hence the depressions and elevations present on the surface of objects cause friction.

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Re-Attempt Weekly Quiz Competition

Friction Test - 28

Result

Friction Test - 28

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Rank

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SHARING IS CARING

Question 1

Increased friction between the road and the tyres

Lubrication of brakes on a wet road

Reduced friction between the road and the tyres

Streamlined shape of the car

Solution

Question 2

Larger friction with the ice.

Smaller friction with the ice.

A larger normal force.

A smaller normal force.

Solution

Question 3

Force of gravity

Magnetic force

Electric force

Frictional force

Solution

Question 4

Stick to each other

Slide upon each other

Roll upon each other

None of these

Solution

Question 5

Oil

Ball bearings

Sand

Graphite

Solution

Question 6

Oil

Grease

Gum

Graphite

Solution

Question 7

To increase friction.

To decrease friction.

To multiply friction.

To decrease grip.

Solution

Question 8

Adhesive force between the molecules

Cohesive force between the molecules

Repulsive forces between the molecules

Both $$2$$ and $$3$$

Solution

Question 9

As smoother the surface, the farther the ball traveled

As rough the surface, the farther the ball traveled

As smoother the surface, the nearer the ball traveled

None of these

Question 10

True

False

Ambiguous

Data Insufficient

Solution

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