Friction Test

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Friction Test - 17

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Weekly Quiz Competition

Question 1
1 / -0

You are marooned on a frictionless horizontal surface and cannot exert any horizontal force by pushing against the surface. How can you get off?

A
By jumping

B
By spitting or sneezing

C
By rolling your body on the surface

D
By running on the plane

Solution

We will need friction to roll or run on any surface. In our case, we have a frictionless surface. Hence, by conservation of linear momentum sneezing can make us move on that surface.
Question 2
1 / -0

Fill in the blank.
Force of friction always ____ the applied force.

A
Supports

B
Opposes

C
Extends

D
Increases

Solution

Frictional force acts between two surfaces in contact. It stops the object from moving as the irregularities on both the surface lock into each other, thus obstructing any forward motion. Hence, frictional force always opposes the applied force.
Question 3
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Which of the following forces always acts against the applied force?

A
Muscular force

B
Mechanical force

C
Chemical force

D
Frictional force

Solution

Friction is the force that offers resistance to the relative motion of two surfaces whether solid, liquid or gas against each other. Thus, always acting against the applied force.
Ex: let a force is applied on a block kept on the floor in right direction, the direction of friction always will be towards left.
Question 4
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Friction between any two objects is due to

A
Attraction between them

B
Repulsion between them

C
Some adhesive forces between them

D
Irregularities on the surfaces

Solution

Friction between two surfaces is primarily due to the irregularities on the surface. The hills and valleys of one surface interlock with the same of the other surface, this creates restrictive force between two surfaces which restricts relative motion.
Question 5
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A ball rolling on the ground stops on its own after some time. Why?

A
The ball is stopped by an external force.

B
The force of friction acts against the motion of the ball.

C
The ball moves only for a set period of time.

D
None of the above

Solution

The force of friction acts between the two surfaces by opposing the relative motion of one surface over the other. For example, when the ball rolls on the ground, the force of friction acts between the surface of the ball and the surface of the ground. The irregularities between the two surfaces lock into each other and thus, stop the ball from moving any further unless it is moved by an external force.
Question 6
1 / -0

Friction opposes the _____ between two surfaces in contact.

A
pressure

B
current

C
motion

D
all of the above

Solution

Frictional force acts against the applied force by opposing it and thus, obstructs the motion between the two surfaces.
Question 7
1 / -0

Arrange the level of difficulty of walking on the following surfaces in increasing order.
a) On wooden floor b) On concrete floor
c) On wet marble d) On dry marble

A
c < b < a < d

B
d < c < b < a

C
b < a < d < c

D
a < d < c < b

Solution

Friction is created due to irregularities in the two surfaces in contact. We can walk on a floor when sufficient friction is present there. So, less friction, more difficult it is to walk and a higher chance of slipping. The irregularities on the concrete floor will be most followed by wooden floor, dry marble and wet marble. Thus, the most difficult surface to walk on will be wet marble followed by dry marble, wood and concrete.
Question 8
1 / -0

Frictional force is more between which type of surfaces?

A
Smooth

B
Rough

C
Both A and B

D
None of the above

Solution

Friction is caused due to the irregularities between two surfaces in contact. More the irregularities, the larger the roughness and more the friction between the two surfaces. Hence the frictional force is more between rough surfaces.
Question 9
1 / -0

Frictional force always acts in which direction?

A
Opposite to that of the object in motion.

B
In the same direction as that of the object in motion

C
In any direction

D
None of the above

Solution

Frictional force offers the resistance to the applied force opposing its motion. Thus, it always acts in the direction opposite to that of the object in motion. If force is applied to the left, then friction acts in the right.
Question 10
1 / -0

Which of the following factors affect friction ?

A
Nature of the surface

B
Weight of the object placed over other

C
State of Motion of the object

D
All of the above

Solution

Friction force $$f=\mu N$$
Where,
$$\mu$$ is coefficient of friction. Its value depends on surface roughness or nature of surface, state of motion. If an object is in motion, Kinetic friction coefficient $$(\mu_k)$$ comes into use whereas when it is in rest then Static friction coefficient $$(\mu_s)$$ comes in use, and generally $$(\mu_s)>(\mu_k)$$.
$$N$$ is normal contact force, which depends on the weight of the object.
From the above discussion, we can say that Friction force depends on the nature of the surface, Weight of the object placed over others, State of Motion of the object.
Hence Option D

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Re-Attempt Weekly Quiz Competition

Friction Test - 17

Result

Friction Test - 17

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SHARING IS CARING

Question 1

By jumping

By spitting or sneezing

By rolling your body on the surface

By running on the plane

Solution

Question 2

Supports

Opposes

Extends

Increases

Solution

Question 3

Muscular force

Mechanical force

Chemical force

Frictional force

Solution

Question 4

Attraction between them

Repulsion between them

Some adhesive forces between them

Irregularities on the surfaces

Solution

Question 5

The ball is stopped by an external force.

The force of friction acts against the motion of the ball.

The ball moves only for a set period of time.

None of the above

Solution

Question 6

pressure

current

motion

all of the above

Solution

Question 7

c < b < a < d

d < c < b < a

b < a < d < c

a < d < c < b

Solution

Question 8

Smooth

Rough

Both A and B

None of the above

Solution

Question 9

Opposite to that of the object in motion.

In the same direction as that of the object in motion

In any direction

None of the above

Solution

Question 10

Nature of the surface

Weight of the object placed over other

State of Motion of the object

All of the above

Solution

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