Forces and Laws of Motion Test

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Forces and Laws of Motion Test - 29

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Weekly Quiz Competition

Question 1
1 / -0

______ of the body is a measure of inertia. Fill in the blanks.

A
Mass

B
Force

C
Velocity

D
Speed

Solution

The object having the greatest mass has the greatest inertia. Thus mass is the measure of inertia.
Question 2
1 / -0

When you hit a wall and sponge with equal force. Which case will hurt more?

A
Both equally

B
Wall

C
Sponge

D
No comparison

Solution

When you apply force (hit) on a wall, the wall too applies equal and opposite force on your hand. The wall applies a huge force on your hand and takes a very short time to stop the impact. Lesser the time taken to stop the impact, more is the impulse on your hand. So, you get more hurt.
Whereas, when you hit a sponge, your hand goes inside the sponge to some extent, due to which more time is required to stop the impact. So, the impulse on your hand is comparatively less, due to which you are less hurt when you hit a sponge.
Hence, Option B
Question 3
1 / -0

Which is correct for balanced and unbalanced forces?

A
If set of forces acting on body results in change in state such forces are called unbalanced forces

B
Object is in equilibrium if sum of all forces is zero i.e. $$\sum F_x = 0$$

C
The object is in non-equilibrium state and the resultant force is non-zero. i.e. $$\sum F_x \neq 0$$

D
All

Solution

If a set of forces acting on a body does not change the state of rest or of motion of an object such forces are called balanced forces. In this case object is said to be in equilibrium state. The vector sum of all forces is zero i.e. $$\sum F_x = 0$$.
Set of forces acting on body results in change in state i.e. either changes the speed or direction, such forces are called unbalanced forces. In this case the object is in non-equilibrium state and the resultant force is non-zero. i.e. $$\sum F_x \neq 0$$.
Question 4
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A batsmen hits a sweep short in the game of cricket. What is the nature of force experienced by the ball during the impact?

A
Balanced force

B
Unbalanced force

C
Both Balanced and Unbalanced forces

D
Neither balanced not unbalanced force

Solution

We know that balanced forces mean that these forces will not produce net momentum to the body.But unbalanced forces provide net momentum to the object.
During impact, the direction of the ball and its speed changes. Hence, momentum changes. Thus, an unbalanced force is applied on the ball.
Question 5
1 / -0

A force acts between two bodies if:

A
both the bodies are pushing each other.

B
both the bodies are pulling each other.

C
either of the two bodies are pushing or pulling the other body.

D
all of these

Solution

Force is kind of a push or a pull. So, in all the above cases there is a force acting between two bodies.
Question 6
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What kind of force is required to accelerate the motion of an object?

A
Balanced force

B
Unbalanced force

C
Pressurized force

D
Equal and opposite force

Solution

Unbalanced forces produce a resultant force acting on the object in a particular direction which tends the object to accelerate in that particular direction.
Question 7
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Spring scale reads $$20\ N$$ as it pulls a $$4.0\ kg$$ object across a table. What is the magnitude of the force exerted by an object on the spring scale?

A
$$40\ N$$

B
$$20\ N$$

C
$$4\ N$$

D
$$5\ N$$

Solution

According to Newton's third law of motion, every action has its equal and opposite reaction.
Thus the object exerts the same amount of force on the spring scale as the force exerted by the spring scale on the object i.e. $$20$$ $$N$$.
Question 8
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"Every action has its equal and opposite reaction" is Newton's:

A
First law of motion

B
Second law of motion

C
Third law of motion

D
Fourth law of motion

Solution

Newton's third law of motion states that every action has an equal and opposite reaction. Force on a body 2 applied by the body 1 $$(F_{21})$$ is equal and opposite to the force on body 1 applied by the body 2 $$(F_{12})$$, i.e.
$$F_{21}=-F_{12}$$
Question 9
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If two bodies do not interact

A
still a force can be applied

B
no force can be applied

C
contact force can be applied

D
non-contact force can be applied

Solution

If two bodies do not interact there won't be any force between them as
interaction is must for having any sort of force between two bodies.
Question 10
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The law that gives a qualitative definition of force is :

A
Newton's second law of motion

B
Law of inertia

C
Newton's third law of motion

D
Law of gravitation

Solution

Law of inertia states that the body tends to remain in the same state (regarding its velocity and direction) untill no external force is acting on it.
Hence option B is correct.

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Forces and Laws of Motion Test - 29

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Forces and Laws of Motion Test - 29

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SHARING IS CARING

Question 1

Mass

Force

Velocity

Speed

Solution

Question 2

Both equally

Wall

Sponge

No comparison

Solution

Question 3

If set of forces acting on body results in change in state such forces are called unbalanced forces

Object is in equilibrium if sum of all forces is zero i.e. $$\sum F_x = 0$$

The object is in non-equilibrium state and the resultant force is non-zero. i.e. $$\sum F_x \neq 0$$

All

Solution

Question 4

Balanced force

Unbalanced force

Both Balanced and Unbalanced forces

Neither balanced not unbalanced force

Solution

Question 5

both the bodies are pushing each other.

both the bodies are pulling each other.

either of the two bodies are pushing or pulling the other body.

all of these

Solution

Question 6

Balanced force

Unbalanced force

Pressurized force

Equal and opposite force

Solution

Question 7

$$40\ N$$

$$20\ N$$

$$4\ N$$

$$5\ N$$

Solution

Question 8

First law of motion

Second law of motion

Third law of motion

Fourth law of motion

Solution

Question 9

still a force can be applied

no force can be applied

contact force can be applied

non-contact force can be applied

Solution

Question 10

Newton's second law of motion

Law of inertia

Newton's third law of motion

Law of gravitation

Solution

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