Forces and Laws of Motion Test

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Forces and Laws of Motion Test - 28

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Weekly Quiz Competition

Question 1
1 / -0

Which of the following actions can be grouped as pull:
a. Moving a loaded cart
b. Applying brakes while driving car
c. Drawing a bucket of water from a well

A
Only a

B
a and b

C
b and c

D
a and c

Solution

For moving a loaded cart and drawing a bucket of water from a well, the action involved is pulling hence can be grouped as Pull.
Question 2
1 / -0

What happens when there is no interaction between the objects?

A
Force comes in action.

B
Force does not come in action.

C
Force may or may not come in action.

D
None of the above is correct

Solution

There are two types of force
1) Interactive force: Its effect comes when two objects will come in contact.
2) Non- Interactive force: Its effect will come when an object comes in their respective field strength.
exp: Charge in an electric field, Mass in gravitation field.
Hence Option C.
Question 3
1 / -0

Identify the type of force involved in opening the door of refrigerator.

A
Pulling

B
Pushing

C
Heating

D
Cooling

Solution

The action involved to open the door of the refrigerator is pulling because the door is moving towards us. Force is applied by our arm to PULL the door of the refrigerator.
Question 4
1 / -0

Fill in the blanks:
In the game of tug-of-war, both the teams pulls each other. So ________.

A
force is applied due to interaction.

B
force is not applied although there is interaction.

C
force is applied although there is an interaction.

D
none of the above.

Solution

Force always comes into action when there will be interaction between the objects, Here both the teams are exerting force on each other through the rope.
Question 5
1 / -0

Group the following examples as a pull or a push or both?
(i) Opening a drawer
(ii) Opening or shutting a door
(iii) Hitting a ball

A

Pull - (i)
Push and Pull - (ii)
Push (iii)

B

Pull - (ii)
Push and Pull - None
Push (i & iii)

C
All are examples of pushing

D
All are examples of pulling

Solution

To open a drawer action involved is pull, for opening and shutting a door both action is involved, hitting a ball pushing involved.
Question 6
1 / -0

Fill in the blanks:
An interaction of one object with another object results in a _________ between the two objects.

A
Pressure

B
Attraction

C
Force

D
Repulsion

Solution

When one object interacts with another object they exert force on each other, either towards or away from each other.
Question 7
1 / -0

Fill in the blanks:
Force comes into action when ________.

A
objects interact.

B
objects do not interact.

C
object move.

D
None of these

Solution

When two body interact with each other then momentum of body will change that change in momentum of the body is effect of mutual force between them.
Question 8
1 / -0

In which direction does a car at rest move when pushed by a few persons?

A
In the direction opposite to push

B
In the direction of the push

C
Making an acute angle with the push

D
None of the above

Solution

To move a car there must be interactions between the men and the car. The interaction is exerted in terms of push and the car moves in the direction of net force which is the direction of push, i.e., in the direction of the force applied.
Question 9
1 / -0

Mark the correct statement(s).

A
When unbalanced forces act on an object at rest, the object will move.

B
Unbalanced forces are necessary to cause a non-moving object to start moving.

C
Unbalanced forces produces change in motion (acceleration).

D
All

Solution

Unbalanced forces result in a non-zero net external force acting on a body which produces an acceleration of the body in a particular direction and hence the body at rest starts to move in that direction. Thus unbalanced forces are necessary to cause a non moving object to start moving. Thus option D is correct.
Question 10
1 / -0

The force acting on an object are balanced, then the object:

A
must be at rest

B
must be moving

C
must not be accelerating

D
must lose energy

Solution

Balanced forces always result in a zero external force acting on an object i.e $$F_{ext} =0$$
$$\therefore$$ Acceleration $$a = \dfrac{F_{ext}}{m} = 0$$
Thus the object must not be accelerating or it must be moving with constant velocity or remain at rest (if it was at rest initially). Hence option C is correct.

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Re-Attempt Weekly Quiz Competition

Forces and Laws of Motion Test - 28

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Forces and Laws of Motion Test - 28

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Question 1

Only a

a and b

b and c

a and c

Solution

Question 2

Force comes in action.

Force does not come in action.

Force may or may not come in action.

None of the above is correct

Solution

Question 3

Pulling

Pushing

Heating

Cooling

Solution

Question 4

force is applied due to interaction.

force is not applied although there is interaction.

force is applied although there is an interaction.

none of the above.

Solution

Question 5

Pull - (i)Push and Pull - (ii)Push (iii)

Pull - (ii)Push and Pull - NonePush (i & iii)

All are examples of pushing

All are examples of pulling

Solution

Question 6

Pressure

Attraction

Force

Repulsion

Solution

Question 7

objects interact.

objects do not interact.

object move.

None of these

Solution

Question 8

In the direction opposite to push

In the direction of the push

Making an acute angle with the push

None of the above

Solution

Question 9

When unbalanced forces act on an object at rest, the object will move.

Unbalanced forces are necessary to cause a non-moving object to start moving.

Unbalanced forces produces change in motion (acceleration).

All

Solution

Question 10

must be at rest

must be moving

must not be accelerating

must lose energy

Solution

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Pull - (i)
Push and Pull - (ii)
Push (iii)

Pull - (ii)
Push and Pull - None
Push (i & iii)