Friction Test

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Friction Test - 21

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Weekly Quiz Competition

Question 1
1 / -0

Which of the following statements indicates advantage of fluid friction?

A
Walking on road

B
Rolling stone on carpet

C
Lubricating machine parts

D
None of the above

Solution

Lubricating machine parts indicates advantage of fluid friction. This helps in lowering the friction and thus helps to keep parts of machinery in good condition for some time.
Question 2
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Which of the following are done to increase friction?

A
Making groove in the shoes

B
polishing rough surface

C
using ball bearing in wheels

D
Creating an air cushion

Solution

Soles of shoes are grooved because the grooves increases the irregularities and hence the friction and gives the good grip to the person while walking with shoes
Question 3
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Which of the following factors affects friction ?

A
Nature of the surface

B
Weight of object placed over other

C
Amount of surface area in contact between the moving bodies

D
Both A and B
Solution
The factors affecting friction are
Nature of the surface : The rough surface has higher coefficient of friction resulting in higher friction and the surface with lower coefficient of friction resulting in less friction.
Weight of the object place over other: This is the normal reaction which the surface applies on the object. For example, it is always difficult to push a heavier object than a lighter one.
Question 4
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Choose the correct option

A
The friction force is dependent on the roughness of the surface.

B
The kinetic friction is proportional to normal reaction.

C
The friction is independent on the area of contact.

D
All statement are correct.

Solution

(I). Frictional resistance is directly proportion to the force applied to the two surfaces as well as the roughness of the surfaces. The rougher the surfaces, the greater the resistance

Friction is caused when two surfaces move against each other in opposing directions.

The resistance offered by friction depends directly on the force applied to move the two surfaces and the roughness of the surfaces.

The smoother the surfaces, the less the resistance; the rougher the surface, the more the resistance

(II).The frictional force is directly proportional to the normal force between the two surfaces in contact. Because when two surfaces are pressed together harder, there is more friction.

(III). Since pressure equals force divided by the area of contact, it works out that the increase in friction generating area is exactly offset by the reduction in pressure; the resulting frictional forces then, are dependent only on the frictional coefficient of the materials and the force holding them together.
Question 5
1 / -0

Does the smoothness of a surface reduce the friction force ?

A
Yes

B
No

C
Sometimes

D
Depend on the amount of force appiled

Solution

Friction is caused by the irregularities on the two surfaces in contact. Larger the irregularities, rougher the surface means more is the friction. Thus, the smoothness of the surface reduces the frictional force.
Question 6
1 / -0

Fill in the blanks
Dynamic Fluid friction is _______ the sliding friction of solids.

A
heigher than

B
lower than

C
same as

D
higher than or equal to

Solution

Dynamic fluid friction is higher than the sliding friction of solids.
Question 7
1 / -0

Select the correct alternative:
Friction is reduced by

A
Making the surfaces wet

B
Making the surfaces dry

C
Making the surfaces rough

D
Sprinkling sand on the surface

Solution

Friction can be reduced by improving overall lubrication between the surfaces that are in contact, by filling the rough surfaces with different lubricants i.e. making the surface wet. (Option A)
Question 8
1 / -0

Match the following
List I List II
a. frictional force e. reduction of friction
b. rolling friction f. causes wear and tear
c. ball bearing g. less than kinetic friction
d. trading of surface h. increase of friction

The correct match is

A
$$a \rightarrow i; b \rightarrow e; c \rightarrow h; d \rightarrow f$$

B
$$a \rightarrow f; b \rightarrow f; c \rightarrow e; d \rightarrow g$$

C
$$a \rightarrow f; b \rightarrow g; c \rightarrow e; d \rightarrow h$$

D
$$a \rightarrow i; b \rightarrow f; c \rightarrow h; d \rightarrow e$$

Solution

$$>>$$Friction force is due to interlocking of two surfaces upto some extend when any external force acts the bonding suface breaks causes wear and tear.
$$>>$$The purpose of a ball bearing is to reduce rotational friction and support radial and axial loads.
$$>>$$ trading of surface is done to increase the interlocking capacity of two surfaces which indirectly increases frictional force.
So the best possible answer is option $$C$$.
Question 9
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In fig, a boy is shown pushing the box from right to left. The force of friction will act on the box:

A
from right to left $$\left (\leftarrow \right)$$

B
from left to right $$\left (\rightarrow \right)$$

C
vertically downwards $$\left (\downarrow \right)$$

D
vertically upwards $$\left (\uparrow \right)$$

Solution

A frictional force acts in the opposite direction of relative movement or tendency of the movement.

Hence, it acts from left to right in this case.

Option B is correct.
Question 10
1 / -0

To sharpen the blade of a knife by rubbing it against a surface, which of the following will be most suitable?

A
stone

B
plastic block

C
wooden block

D
glass block

Solution

Stone exerts a greater frictional force which sharpens the blades upon rubbing.

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Re-Attempt Weekly Quiz Competition

List I	List II
a. frictional force	e. reduction of friction
b. rolling friction	f. causes wear and tear
c. ball bearing	g. less than kinetic friction
d. trading of surface	h. increase of friction

Friction Test - 21

Result

Friction Test - 21

Score

-

Rank

-

SHARING IS CARING

Question 1

Walking on road

Rolling stone on carpet

Lubricating machine parts

None of the above

Solution

Question 2

Making groove in the shoes

polishing rough surface

using ball bearing in wheels

Creating an air cushion

Solution

Question 3

Nature of the surface

Weight of object placed over other

Amount of surface area in contact between the moving bodies

Both A and B

Solution

Question 4

The friction force is dependent on the roughness of the surface.

The kinetic friction is proportional to normal reaction.

The friction is independent on the area of contact.

All statement are correct.

Solution

Question 5

Yes

No

Sometimes

Depend on the amount of force appiled

Solution

Question 6

heigher than

lower than

same as

higher than or equal to

Solution

Question 7

Making the surfaces wet

Making the surfaces dry

Making the surfaces rough

Sprinkling sand on the surface

Solution

Friction can be reduced by improving overall lubrication between the surfaces that are in contact, by filling the rough surfaces with different lubricants i.e. making the surface wet. (Option A)

Question 8

$$a \rightarrow i; b \rightarrow e; c \rightarrow h; d \rightarrow f$$

$$a \rightarrow f; b \rightarrow f; c \rightarrow e; d \rightarrow g$$

$$a \rightarrow f; b \rightarrow g; c \rightarrow e; d \rightarrow h$$

$$a \rightarrow i; b \rightarrow f; c \rightarrow h; d \rightarrow e$$

Solution

Question 9

from right to left $$\left (\leftarrow \right)$$

from left to right $$\left (\rightarrow \right)$$

vertically downwards $$\left (\downarrow \right)$$

vertically upwards $$\left (\uparrow \right)$$

Solution

Question 10

stone

plastic block

wooden block

glass block

Solution

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