Friction Test

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Friction Test - 2

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Weekly Quiz Competition

Question 1
1 / -0

Which of the following statements is/are incorrect?

A
Friction can never be entirely eliminated.

B
Friction can be reduced by wing lubricants.

C
A perfectly smooth surface with no irregularities can be fabricated.

D
All of the above

Solution

The surfaces of bodies are never perfectly smooth. Even a very smooth surface seen under a microscope is found to have depressions and projections.
Question 2
1 / -0

Which of the following statements is true?

A
Application of lubricant reduces the area of contact between the two bodies, thus reducing friction.

B
Applyication of lubricant such as oil reduces the force by which the surfaces are pressed against each other due to buoyancy, thus reducing friction.

C
Application of lubricant forms a thin film of lubricant on the two surfaces preventing direct contact, thus reducing friction.

D
All of the above

Solution

When lubricant is applied between the two surfaces , a thin layer is formed there and moving surfaces do not directly rub against each other and interlocking of irregularities is avoided to a great extent. Movement becomes smooth.
Question 3
1 / -0

Sliding in most machines is replaced by rolling by the use of

A
axles

B
gears

C
ball bearings

D
hubs

Solution

Sliding in most machines is replaced by rolling by the use of ball bearings. Ball bearing provide rolling friction which is less than sliding friction.
Question 4
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The technical name for the friction force exerted by fluids on objects in motion through them is called

A
sliding friction

B
static friction

C
drag

D
resistance

Solution

The frictional force exerted by fluids is also called drag.
Question 5
1 / -0

On which of the following factors does the drag experienced by a body moving through air depends?

(a) Mass of the body
(b) Shape of the body
(c) Speed of the body

A
Both (a) and (b)

B
Both (a) and (c)

C
Both (b) and (c)

D
All of the above

Solution

Drag does not depend on the mass. It just depends on the shape of the body and the speed. Two bodies of the same mass can experience different values of drag.
Question 6
1 / -0

A recovery truck is moving on the North-South highway from South to North. It is towing a 1500 kg car behind it. In which direction will the force of friction act on the car?

A
North

B
South

C
East

D
West

Solution

As the vehicles are moving from South to North, the relative motion of the tyres of the car with respect to the surface of the road is towards North. Hence, frictional force on the car will act towards South as the force of friction opposes the relative motion between the surfaces in contact.
Question 7
1 / -0

Which of the following statements is false?

A
Force of friction depends on the smoothness of the surfaces in contact with each other.

B
Friction is caused by the irregularities on the two surfaces in contact with each other.

C
No force is required to keep an object moving over a surface so as to overcome friction.

D
Force of friction is greater if a rough surface is involved.

Solution

If we want to move an object, we have to apply the force so as to overcome the friction between the object and the surface.
Question 8
1 / -0

A marble is rolled down an inclined plane onto 4 different surfaces (A, B, C, D) with the number of irregularities per unit area in the decreasing order as A > B > C > D. On which surface will the marble cover the greatest distance?

A
A

B
B

C
C

D
D

Solution

As surface D has the least number of irregularities, it is the smoothest of all the surfaces. Hence, it will offer the least resistance to the marble. Hence, the marble covers the greatest distance on surface D.

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Re-Attempt Weekly Quiz Competition

Friction Test - 2

Result

Friction Test - 2

Score

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Rank

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SHARING IS CARING

Question 1

Friction can never be entirely eliminated.

Friction can be reduced by wing lubricants.

A perfectly smooth surface with no irregularities can be fabricated.

All of the above

Solution

Question 2

Application of lubricant reduces the area of contact between the two bodies, thus reducing friction.

Applyication of lubricant such as oil reduces the force by which the surfaces are pressed against each other due to buoyancy, thus reducing friction.

Application of lubricant forms a thin film of lubricant on the two surfaces preventing direct contact, thus reducing friction.

All of the above

Solution

Question 3

axles

gears

ball bearings

hubs

Solution

Question 4

sliding friction

static friction

drag

resistance

Solution

Question 5

Both (a) and (b)

Both (a) and (c)

Both (b) and (c)

All of the above

Solution

Question 6

North

South

East

West

Solution

Question 7

Force of friction depends on the smoothness of the surfaces in contact with each other.

Friction is caused by the irregularities on the two surfaces in contact with each other.

No force is required to keep an object moving over a surface so as to overcome friction.

Force of friction is greater if a rough surface is involved.

Solution

Question 8

A

B

C

D

Solution

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