Friction Test

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Friction Test - 18

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Question 1
1 / -0

Can friction ever be eliminated?

A
Yes

B
No

C
Sometimes

D
Depends on the object in regard

Solution

No matter how smooth or polished a surface might be, it will always have some irregularities at microscopic level. Thus, the friction can never be eliminated.
Question 2
1 / -0

Does the smoothness of a surface affect the frictional force?

A
Yes

B
No.

C
Sometimes

D
Can't say

Solution

Friction is caused by the irregularities on the two surfaces in contact. Larger the irregularities, rougher is the surface and more the friction. Thus, the smoothness of the surface affects the frictional force.
Question 3
1 / -0

Friction produces ______.

A
light

B
sound

C
heat

D
chemical

Solution

Friction is produced due to the irregularities between surfaces. Thus, when these surfaces rub against each other they produce heat. And the heat gets trapped in these irregularities.
Question 4
1 / -0

_______ helps in writing with a pen or pencil on a paper.

A
Magnetic force

B
Electric charge

C
Chemical force

D
Frictional force

Solution

The irregularities between the paper and the pen or pencil create friction. Due to friction, the particles of ink or lead stick to the paper and get locked in its irregularities. If there would be no friction between the paper and pen or pencil, the ink/lead would not stick to the paper and we would not be able to write.
Question 5
1 / -0

Force that opposes the motion of any object even when no other external force is applied is called _____.

A
electric current

B
magnetic force

C
frictional force

D
mechanical force

Solution

Frictional force always acts in direction opposite to that of the applied force. The irregularities between the two surface lock into each other, thus opposing any further motion even when no external force is applied to stop the moving body.
Question 6
1 / -0

How do brake pads help in stopping an automobile?

A
Brake pads press on the wheel and increase friction.

B
Due to braking, the air pressure increases and the wheels stop.

C
Both A and B

D
None of the above

Solution

The brake pads press on the wheels and increase the friction since the surface of the brake pads and the wheels are irregular, and the rough surface increases friction that opposes the motion of the wheel.
Question 7
1 / -0

Kabaddi players rub their hands with soil so that they can :

A
make their skin dry

B
moisture the hands

C
get a better grip while holding the opponent

D
soil the opponent

Solution

By rubbing their hands with soil, they make their hands rough. A rough surface has more friction which enhances their grip while holding the opponent.
Question 8
1 / -0

Fluid friction depends on ______

A
speed of the object

B
shape of the object

C
nature of fluid

D
all of the above

Solution

The speed of the object moving through a fluid affects the amount of friction acting against the motion of the object. More the speed, more is the friction. If the object is broad, it gives more area for the friction to act on. Thus, a streamlined body structure helps to cut through the fluid and reduce friction. Also, the nature of the fluid affects friction.
Question 9
1 / -0

Fluid friction is exerted by _____ .

A
Solids and liquids

B
Solids and gases

C
Liquids and gases

D
All the above

Solution

Liquids and gases are together referred to as fluids and the frictional force exerted by them on various objects is called fluid friction.
Question 10
1 / -0

The substance that helps to ______ friction are called lubricants.

A
increase

B
decrease

C
create

D
eliminate

Solution

Oils, grease, graphite, etc., are examples of lubricants. These form a thin layer between the two surfaces in contact thus avoiding them from scrubbing directly against each other. This makes the movement smooth and reduces friction.

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Re-Attempt Weekly Quiz Competition

Friction Test - 18

Result

Friction Test - 18

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SHARING IS CARING

Question 1

Yes

No

Sometimes

Depends on the object in regard

Solution

Question 2

Yes

No.

Sometimes

Can't say

Solution

Question 3

light

sound

heat

chemical

Solution

Question 4

Magnetic force

Electric charge

Chemical force

Frictional force

Solution

Question 5

electric current

magnetic force

frictional force

mechanical force

Solution

Question 6

Brake pads press on the wheel and increase friction.

Due to braking, the air pressure increases and the wheels stop.

Both A and B

None of the above

Solution

Question 7

make their skin dry

moisture the hands

get a better grip while holding the opponent

soil the opponent

Solution

Question 8

speed of the object

shape of the object

nature of fluid

all of the above

Solution

Question 9

Solids and liquids

Solids and gases

Liquids and gases

All the above

Solution

Question 10

increase

decrease

create

eliminate

Solution

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