Test: Force and Laws of Motion- Assertion & Reason Type Questions

# Test: Force and Laws of Motion- Assertion & Reason Type Questions - Class 9

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## 15 Questions MCQ Test Physics for Class 9 - Test: Force and Laws of Motion- Assertion & Reason Type Questions

Test: Force and Laws of Motion- Assertion & Reason Type Questions for Class 9 2023 is part of Physics for Class 9 preparation. The Test: Force and Laws of Motion- Assertion & Reason Type Questions questions and answers have been prepared according to the Class 9 exam syllabus.The Test: Force and Laws of Motion- Assertion & Reason Type Questions MCQs are made for Class 9 2023 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Force and Laws of Motion- Assertion & Reason Type Questions below.
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Test: Force and Laws of Motion- Assertion & Reason Type Questions - Question 1

### Direction: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:Assertion : If a spring is stretched from one side, the size and shape of the spring changes.Reason : Unbalanced force acting on the spring changes the size and shape of the spring in the direction of application.

Detailed Solution for Test: Force and Laws of Motion- Assertion & Reason Type Questions - Question 1
If a spring is stretched from one side, the size and shape of the spring changes. It is because unbalanced force acting on the spring changes the size and shape of the spring in the direction of application.
Test: Force and Laws of Motion- Assertion & Reason Type Questions - Question 2

### Direction: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:Assertion : A boy facing forward in a moving bus throws a ball straight up. At the same instant the bus begins to accelerate. The ball goes up and falls in front of the boy.Reason : As the ball rises, velocity remains constant.

Detailed Solution for Test: Force and Laws of Motion- Assertion & Reason Type Questions - Question 2
Only the horizontal component of velocity of the ball remains unchanged. When the ball rises the vertical component of velocity keeps on decreasing. During this time the bus accelerates out under the ball. To the boy the ball appears to go over his head. The ball, therefore, falls behind him.
Test: Force and Laws of Motion- Assertion & Reason Type Questions - Question 3

### Direction: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:Assertion : When we stop pedalling a bicycle it slows down.Reason : Force of friction always acts in the direction of motion.

Detailed Solution for Test: Force and Laws of Motion- Assertion & Reason Type Questions - Question 3
When we stop pedalling a bicycle it slows down due to force of friction which acts in the opposite direction of motion.
Test: Force and Laws of Motion- Assertion & Reason Type Questions - Question 4

Direction: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:

Assertion : Change in momentum is impulse.

Reason : Impulse is the area between (F-t) graph and time axis.

Detailed Solution for Test: Force and Laws of Motion- Assertion & Reason Type Questions - Question 4
The impulse experienced by the object equals the change in momentum of the object. In equation form, F • t = m • Δ v. In a collision, objects experience an impulse; the impulse causes and is equal to the change in momentum.

The area under a force-time graph is force multiplied by time, which is a quantity called impulse. Impulse is equal to the change in momentum of an object.

Test: Force and Laws of Motion- Assertion & Reason Type Questions - Question 5

Direction: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:

Assertion: If a balanced force is applied on a wooden block it will move.

Reason: Unbalanced force changes the state of motion or rest while balanced force does not.

Detailed Solution for Test: Force and Laws of Motion- Assertion & Reason Type Questions - Question 5
Force applied on both the sides of wooden block in equal magnitude reinforces each other. Therefore do not bring about any change in the state of motion or rest of the object. Such types of forces are known as balanced forces.
Test: Force and Laws of Motion- Assertion & Reason Type Questions - Question 6

Direction: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:

Assertion : Mass is a measure of inertia of the body in linear motion.

Reason : Greater the mass, greater is the force required to change its state of rest or motion.

Detailed Solution for Test: Force and Laws of Motion- Assertion & Reason Type Questions - Question 6
According to Newton’s second law of motion, a = F/m i.e., magnitude of the acceleration produced by a given force is inversely proportional to the mass of the body. Higher is the mass of the body, lesser will be the acceleration produced i.e., mass of the body is a measure of the opposition offered by the body to change a state, when the force is applied i.e., mass of a body is the measure of its inertia.
Test: Force and Laws of Motion- Assertion & Reason Type Questions - Question 7

Direction: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:

Assertion: A five rupee coin has more inertia than one rupee coin.

Reason: Inertia does not depend upon mass of the object.

Detailed Solution for Test: Force and Laws of Motion- Assertion & Reason Type Questions - Question 7
Inertia depends upon the mass of the object. Heavier objects offer more inertia than lighter objects.
Test: Force and Laws of Motion- Assertion & Reason Type Questions - Question 8

Direction: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:

Assertion : Force exerted by the ground on the man moves him forward.

Reason : It is a reactional force.

Detailed Solution for Test: Force and Laws of Motion- Assertion & Reason Type Questions - Question 8

Force exerted by the ground on the man moves him forward is frictional force. However, it is a reactional force too but the force by which man moves forward is frictional.

Test: Force and Laws of Motion- Assertion & Reason Type Questions - Question 9

Direction: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:

Assertion: Sudden application of brakes in a moving car may cause injury.

Reason: Inertia is the tendency of an object to keep moving or being at rest undisturbed.

Detailed Solution for Test: Force and Laws of Motion- Assertion & Reason Type Questions - Question 9
When we are in a moving car, our body is also moving with the velocity of car. Sudden brake applied stops the car as well as lower body portion while upper body portion is still in motion that causes injury.
Test: Force and Laws of Motion- Assertion & Reason Type Questions - Question 10

Direction: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:

Assertion : A table cloth cannot be pulled from a table without dislodging the dishes.

Reason : Newton’s second law of motion gives definition of inertia

Detailed Solution for Test: Force and Laws of Motion- Assertion & Reason Type Questions - Question 10

According to the law of inertia (Newton’s first law), when cloth is pulled from a table, the cloth comes in a state of motion but dishes remain stationary due to inertia. Therefore when we pull the cloth from the table the dishes remain stationary.

Test: Force and Laws of Motion- Assertion & Reason Type Questions - Question 11

Direction: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:

Assertion: Momentum of an object which is the product of mass and velocity is a vector quantity.

Reason: Momentum has both direction as well as magnitude.

Detailed Solution for Test: Force and Laws of Motion- Assertion & Reason Type Questions - Question 11
Momentum of an object which is the product of mass and velocity is a vector quantity. Momentum has both direction as well as magnitude.
Test: Force and Laws of Motion- Assertion & Reason Type Questions - Question 12

Direction: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:

Assertion : When we sit on a chair, our body exerts a force downward and that chair needs to exert an equal force upward or the chair will collapse.

Reason : The third law says that for every action there is an equal and opposite reaction.

Detailed Solution for Test: Force and Laws of Motion- Assertion & Reason Type Questions - Question 12
When you sit in your chair, your body exerts a downward force on the chair and the chair exerts an upward force on your body. There are two forces resulting from this interaction - a force on the chair and a force on your body. These two forces are called action and reaction forces.
Test: Force and Laws of Motion- Assertion & Reason Type Questions - Question 13

Direction: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:

Assertion : When astronauts throw something in space, that object would continue moving in the same direction and with the same speed.

Reason : The acceleration of an object produced by a net applied force is directly related to the magnitude of the force, and inversely related to the mass of the object.

Detailed Solution for Test: Force and Laws of Motion- Assertion & Reason Type Questions - Question 13
The reason and assertion is correct because the force is applied on the object is directly proportional to the mass of the object
Test: Force and Laws of Motion- Assertion & Reason Type Questions - Question 14

Direction: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:

Assertion : A body is momentarily at rest when it reverses the direction.

Reason : A body cannot have acceleration if its velocity is zero at a given instant of time.

Detailed Solution for Test: Force and Laws of Motion- Assertion & Reason Type Questions - Question 14
When a particle is released from rest, υ = 0 but a ≠ 0
Test: Force and Laws of Motion- Assertion & Reason Type Questions - Question 15

Direction: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:

Assertion : From Newton’s second law of motion, impulse is equal to change in momentum.

Reason : Impulse and momentum have different SI units.

Detailed Solution for Test: Force and Laws of Motion- Assertion & Reason Type Questions - Question 15
As impulse is equal to change in momentum. Therefore, impulse and momentum have same SI units.

## Physics for Class 9

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## Physics for Class 9

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