Friction Test

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Friction Test - 27

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Weekly Quiz Competition

Question 1
1 / -0

A ball moving on ground eventually stops. Mark the correct reason

A
Because no external force is applied on the ball by the surface

B
Because an object in motion should come to rest no matter what

C
Because of frictional force between ball and the ground

D
None of these

Solution

A ball moving on the ground eventually stops because of frictional force between the ball and the ground. Friction opposes the relative motion between two surfaces in contact. It acts on both surfaces.
Question 2
1 / -0

When two surfaces are coated with lubricant, friction between the surfaces _______.

A
becomes zero

B
decreases

C
remains constant

D
increases

Solution

When two surfaces are coated with lubricant then the small irregularities (elevations and depressions ) gets filled and become almost even surface hence both objects can slide against each other easily so friction is reduced.
Question 3
1 / -0

When a ball is left rolling on ground it stops after some time.What bring the rolling ball to rest?

A
Force of friction

B
Gravitational force

C
Air drag

D
Buoyant force

Solution

Friction is the resistive force which opposes motion of an object on any other object.Here the friction between ground and ball in contact opposes the motion of rolling ball and the ball stops after sometime.
Question 4
1 / -0

Read the given statements and select the correct option.
$$Statement$$ $$1$$ : It takes a much longer time and covers more distance to stop a moving ship in water than a moving car with same speed on the road.
$$Statement$$ $$2$$ : The friction on water surface is much less than the solid surface.

A
Both statements 1 and 2 are true and statement 2 is the correct explanation of statement 1.

B
Both statements 1 and 2 are true and statement 2 is not the correct explanation of statement 1.

C
Statement 1 is true but statement 2 is false.

D
Statement 1 is false but statement 2 is true.

Solution
Question 5
1 / -0

Friction produces.

A
Light

B
Alpha rays

C
Heat

D
All of these

Solution

When surfaces in contact move relative to each other, the friction between the two surfaces converts kinetic energy into thermal energy (that is, it converts work to heat). Friction causes the molecules on rubbing surfaces to move faster, so they have more energy.
Question 6
1 / -0

Select the correct alternative:
Friction is increased if

A
An oil is sprayed

B
The surface are made wet

C
The surfaces are made dry

D
The surfaces are polished

Solution

Friction occurs between two surfaces when the surfaces are not smooth. On a molecular scale, materials have bumps and ridges, which get stuck on the bumps and ridges of the other material.
Hence dry surfaces have more friction whereas liquids, such as water, act as a lubricant and fill these gaps and reduce friction. (Option C)
Question 7
1 / -0

Tick the most appropriate answer:
Force of friction comes into play when a/an

A
Object attempts motion

B
Moving object tries to stop

C
Object is at rest

D
All of the these

Solution

Friction is a force that tries to resist the change in motion. It is present even when the object is at rest (Static friction).
When an object attempts motion, friction will try to stop it. Option (A) is therefore correct.
When a moving object tries to stop friction will try to keep it in motion. Option (B) is also correct.
When the object is at rest static friction is present to stop motion. Option (C) is also correct.
Henece all of these are correct and the correct answer is option (D), i.e all of these.
Question 8
1 / -0

If the outer surface of a glass tumbler is greasy. it would become

A
Difficult to hold it, because friction get increased

B
Difficult to hold it, because friction get reduced

C
Easier to hold it because friction get increased

D
Easier to hold it because friction get reduced

Solution
Question 9
1 / -0

Tick the most appropriate answer:
If you pour some oil onto a floor, the friction would

A
Increase

B
Decrease

C
Remain the same

D
None of these

Solution

The oil has much lesser value of coefficient of friction than that of a regular floor. When we put oil on a floor the coefficient of friction decreases which will cause the friction to decrease as well.
The correct answer is option (B).
Question 10
1 / -0

Friction for an object can be reduced by:

A
Providing wheels

B
Lubricating

C
Streamlining

D
All of the above

Solution

Friction opposes the relative motion between two surfaces in contact. Friction is sometimes undesirable. Friction can be reduced by:
$$i.$$ Using lubricants.
$$ii.$$ Providing wheels- When one body rolls over another body, rolling friction comes into play. Rolling friction is smaller than sliding friction.
$$iii.$$ Streamlining- Fluid friction can be minimized by giving suitable shapes to bodies moving in fluids.

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Friction Test - 27

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Friction Test - 27

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SHARING IS CARING

Question 1

Because no external force is applied on the ball by the surface

Because an object in motion should come to rest no matter what

Because of frictional force between ball and the ground

None of these

Solution

Question 2

becomes zero

decreases

remains constant

increases

Solution

Question 3

Force of friction

Gravitational force

Air drag

Buoyant force

Solution

Question 4

Both statements 1 and 2 are true and statement 2 is the correct explanation of statement 1.

Both statements 1 and 2 are true and statement 2 is not the correct explanation of statement 1.

Statement 1 is true but statement 2 is false.

Statement 1 is false but statement 2 is true.

Solution

Question 5

Light

Alpha rays

Heat

All of these

Solution

Question 6

An oil is sprayed

The surface are made wet

The surfaces are made dry

The surfaces are polished

Solution

Question 7

Object attempts motion

Moving object tries to stop

Object is at rest

All of the these

Solution

Question 8

Difficult to hold it, because friction get increased

Difficult to hold it, because friction get reduced

Easier to hold it because friction get increased

Easier to hold it because friction get reduced

Solution

Question 9

Increase

Decrease

Remain the same

None of these

Solution

Question 10

Providing wheels

Lubricating

Streamlining

All of the above

Solution

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