Forces and Laws of Motion Test

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Forces and Laws of Motion Test - 35

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Weekly Quiz Competition

Question 1
1 / -0

Inertia is that property of a body by virtue of which the body is

A
Unable to change by itself the state of uniform motion

B
Unable to change by itself the state of rest and or uniform linear motion

C
Unable to change by itself the state of rest

D
Unable to change by itself the direction if motion

Solution

Inertia is defined as "A property of matter by which it continues in its existing state of rest or uniform motion in a straight line, unless that state is changed by an external force". It implies option B.
Question 2
1 / -0

The net force acting is not zero on

A
a retarding train

B
a ball falling with terminal velocity

C
a kite held stationary

D
a truck moving with constant velocity

E
a book placed on a table

Solution

The net force acting is not zero on a retarding train as a retarding train means it acquires some negative acceleration.
Question 3
1 / -0

Fill in the blank:
Tendency of an object to _____ a change in its state of rest or motion is called inertia

A
Allow

B
Assist

C
Resist

D
None of these

Solution

Due to inertia, objects resist any change in motion.
Question 4
1 / -0

A bullet is fired from a rifle with a velocity of $$1000\,m/s$$. Its momentum is $$20\ kg\ m/s$$. What will be its mass?

A
$$10\ g$$

B
$$20\ g$$

C
$$50\ g$$

D
$$100\ g$$

Solution

Given$$:$$
Momentum$$=20\,kg\,m/s$$
Velocity$$=1000m/s$$
We know$$,$$
$$Momentum = mass \times velocity$$
$$\begin{array}{l} 20\, kg\, m/s=mass\times 1000\, m/s \\ mass=\dfrac{20}{1000}\ kg=\dfrac { { 20\times 1000} }{ { 1000 } } g=20g \end{array}$$
Hence,
option $$(B)$$ is correct answer.
Question 5
1 / -0

Why does an athlete take a run before doing a long jump?

A
To cheer the crowd

B
She/he likes running

C
To gain momentum

D
To reduce momentum

Solution

Long run up helps athletes gain velocity and hence gain momentum. This momentum helps them jump longer.
Question 6
1 / -0

A car accelerates on a horizontal road due to the force exerted by

A
The engine of the car

B
The driver of the car

C
The car on earth

D
The road on the car

Solution

Hint: Apply Newton's third law.
Explanation: According to Newton’s third law of motion, which states that “If an object exerts a force on another object, then the second object must exert a force of equal magnitude and opposite direction back on the first object”, the car is applying a force on the road via the tires and in return the horizontal road retorts with another force of equivalent magnitude in the opposite direction of the first applied force.
Hence, the car accelerates on the horizontal road.
Hence, the answer is (D)
Question 7
1 / -0

$$4$$ balls are moving in the directions shown. The magnitudes of their momentum are also given in the figure. Find which two have the same momentum.

A
$$A$$ and $$B$$

B
$$C$$ and $$D$$

C
$$A$$ and $$C$$

D
$$A$$ and $$D$$

Solution

Momentum has a magnitude as well as direction. So, two objects have same momentum only when both their magnitude and direction are same.
Hence Option C.
Question 8
1 / -0

There are $$3$$ balls of same shape and size made of wood, iron and plastic. Which one of them would have highest inertia?

A
Wood

B
Iron

C
Plastic

D
None of these

Solution

Inertia depends on mass. Higher the mass, higher the inertia. Iron is the heaviest among all $$3$$ balls. So it has the highest inertia.
Question 9
1 / -0

The symbol and formula for momentum is

A
$$m, pv$$

B
$$p, ma$$

C
$$p, mv$$

D
$$M, mv$$

Solution

The momentum, (symbol $$p$$) of an object is defined as the product of its mass, $$m$$ and velocity, $$v.$$
i.e. $$p = mv$$
Question 10
1 / -0

The $$SI$$ units of Force are _____ or _____.

A
$$kg \ m/s,\ N$$

B
$$kg\ m/s^2, \ Ne$$

C
$$kg\ km/hr$$, Newton

D
$$kg\ m/s^2, \ N$$

Solution

$$F = ma$$,
So the $$SI$$ unit of force = $$(SI\ \text{unit of }\ m).(SI \ \text{unit of}\ a) = kg \ m/s^2$$ or Newton $$(N)$$

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Re-Attempt Weekly Quiz Competition

Forces and Laws of Motion Test - 35

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Forces and Laws of Motion Test - 35

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Question 1

Unable to change by itself the state of uniform motion

Unable to change by itself the state of rest and or uniform linear motion

Unable to change by itself the state of rest

Unable to change by itself the direction if motion

Solution

Question 2

a retarding train

a ball falling with terminal velocity

a kite held stationary

a truck moving with constant velocity

a book placed on a table

Solution

Question 3

Allow

Assist

Resist

None of these

Solution

Question 4

$$10\ g$$

$$20\ g$$

$$50\ g$$

$$100\ g$$

Solution

Question 5

To cheer the crowd

She/he likes running

To gain momentum

To reduce momentum

Solution

Question 6

The engine of the car

The driver of the car

The car on earth

The road on the car

Solution

Question 7

$$A$$ and $$B$$

$$C$$ and $$D$$

$$A$$ and $$C$$

$$A$$ and $$D$$

Solution

Question 8

Wood

Iron

Plastic

None of these

Solution

Question 9

$$m, pv$$

$$p, ma$$

$$p, mv$$

$$M, mv$$

Solution

Question 10

$$kg \ m/s,\ N$$

$$kg\ m/s^2, \ Ne$$

$$kg\ km/hr$$, Newton

$$kg\ m/s^2, \ N$$

Solution

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