Friction Test

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Friction Test - 26

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Weekly Quiz Competition

Question 1
1 / -0

In cold weather, we rub our hands to warm them. The force involved in this is:

A
Static force.

B
Gravitational force.

C
Friction force.

D
Electrostatic force.

Solution

When we rub our hands, heat is produced due to friction. This is the force which is responsible for resisting a motion on a rough surface.
Question 2
1 / -0

Mark the correct statement:

A

Frictional force also exist when there is no motion.

B

Frictional force only exist when there is motion between two objects.

C
Frictional force is nothing but the weight of the body

D
None

Solution

A friction also exist when there is no motion. If two objects are in contact then we can talk about friction force. There is no essentiality of presence of motion for this because friction force is a adjustable force.
Question 3
1 / -0

When a car accelerate rightwards, the friction acts towards leftwards.

A
True

B
False

C
Ambiguous

D
Data insufficient

Solution

The friction is resistive force and it always opposes the motion. Thus, the given statement is true.
Question 4
1 / -0

The arrow with a pointed tip can move faster in air than that of with a blunt tip.

A
True

B
False

C
Ambiguous

D
Data insufficient

Solution

A pointed tip is more sharper than a blunt tip. So the air resistance for the pointed tip is less than that of the blunt tip. Since the air resistance opposes the motion, so the pointed can tip move faster than that of blunt tip. Thus, the given statement is true.
Question 5
1 / -0

Brakes of a very small contact area are not used, although friction is independent of area. It is because friction:

A
depends on the nature of the material

B
causes wear and tear

C
resists motion

D
operating in this case is sliding friction

Solution

Brakes of a very small contact area are not used, although friction is independent of area.
The above condition is because friction causes wear and tear.
It is a known fact, therefore, the correct option is $$B$$.
Question 6
1 / -0

Friction is a force that opposes motion.

A
True

B
False

C
Ambiguous

D
Data insufficient

Solution

Friction is a resistive force between the contact surfaces which can oppose the motion. Thus, the given statement is true. ex: Friction on a cart while pulling it on rough surface.
Question 7
1 / -0

The efficiency of machine is reduced due to friction.

A
True

B
False

C
Ambiguous

D
Data insufficient

Solution

Friction is the force that resists motion when the surface of one object comes into contact with the surface of another. In a machine, friction reduces the mechanical advantage , or the ratio of output to input an automobile, for instance , uses one-quarter of its energy on reducing friction. Hence the efficiency of machine is reduced due to friction.
Question 8
1 / -0

With increase of temperature, the frictional force acting between two surfaces:

A
increases

B
decreases

C
remains same

D
may increases or decreases

Solution

$${\textbf{Explanation:}}$$
$$\bullet$$ With an increase in frictional force, the temperature increases but the vice-versa is not true.
$$\bullet$$ As the temperature increases then distance between the particles of the body increases due to thermal expansion which results in smoothening the surface accordingly and the frictional force between them decreases.

$${\textbf{Correct option: B}}$$
Question 9
1 / -0

Which one of the following can also act as a lubricant in machines?

A
Iron filling

B
Polish on machines

C
Flow of water through the machine

D
Flow of compressed and purified air.

Solution

In the machines, the flow of compressed and purified air lowers the friction, hence it acts as a lubricant.
Question 10
1 / -0

When a body is moving on a surface, the force of friction is called

A
Static friction

B
Kinetic friction

C
Limiting friction

D
Rolling friction

Solution

Kinetic friction is defined as a force that acts between moving surfaces. A body moving on the surface experiences a force in the opposite direction of its movement. The force acts in the opposite direction to the way an object wants to slide.

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Re-Attempt Weekly Quiz Competition

Friction Test - 26

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Friction Test - 26

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SHARING IS CARING

Question 1

Static force.

Gravitational force.

Friction force.

Electrostatic force.

Solution

Question 2

Frictional force also exist when there is no motion.

Frictional force only exist when there is motion between two objects.

Frictional force is nothing but the weight of the body

None

Solution

Question 3

True

False

Ambiguous

Data insufficient

Solution

Question 4

True

False

Ambiguous

Data insufficient

Solution

Question 5

depends on the nature of the material

causes wear and tear

resists motion

operating in this case is sliding friction

Solution

Question 6

True

False

Ambiguous

Data insufficient

Solution

Question 7

True

False

Ambiguous

Data insufficient

Solution

Question 8

increases

decreases

remains same

may increases or decreases

Solution

Question 9

Iron filling

Polish on machines

Flow of water through the machine

Flow of compressed and purified air.

Solution

Question 10

Static friction

Kinetic friction

Limiting friction

Rolling friction

Solution

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