Test: Force and Laws of Motion- Case Based Type Questions

# Test: Force and Laws of Motion- Case Based Type Questions - Class 9

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## 15 Questions MCQ Test Physics for Class 9 - Test: Force and Laws of Motion- Case Based Type Questions

Test: Force and Laws of Motion- Case Based Type Questions for Class 9 2023 is part of Physics for Class 9 preparation. The Test: Force and Laws of Motion- Case Based Type Questions questions and answers have been prepared according to the Class 9 exam syllabus.The Test: Force and Laws of Motion- Case Based 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- Case Based Type Questions below.
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Test: Force and Laws of Motion- Case Based Type Questions - Question 1

### Direction: Read the following paragraph and choose the correct options to answer any four questions given below :A large bus and a van, both moving with a velocity of magnitude v, have a head-on-collision and both the vehicles stop after the collision. The time of the collision is 1 sec.Q. Which vehicle according to you will suffer the less damage?

Detailed Solution for Test: Force and Laws of Motion- Case Based Type Questions - Question 1
(a) Since the action and reaction are equal and opposite during a collision, both the vehicles experience an equal force.

(b) We are given,

Initial velocity of both the bus and the van = v

Final velocity of both the bus and the van = 0

If m₁ and m₂ are the masses of the large bus and the van respectively, where m₁ is much greater than m₂

Change in momentum of the bus = m₁ x (0 — v) = —m₁v

Change in momentum of the van = m₂ x (0 — v) = —m₂v

Since m₁ < m₂, the van will experience smaller momentum change.

(c) The force acting on a body is equal to the product of its mass and the acceleration, i.e.,

F= mass x acceleration = m x a

a = F ÷ m

a α 1 ÷ m

Acceleration experienced by the bus α 1 ÷ m₁

Acceleration experienced by the van , α 1 ÷ m₂

Since m₂ < m₁, therefore the van experiences greater acceleration.

(d) Due to the transfer of small momentum from the van to the bus, the bus suffers less damage than the van.

Test: Force and Laws of Motion- Case Based Type Questions - Question 2

### Direction: Read the following paragraph and choose the correct options to answer any four questions given below : A large bus and a van, both moving with a velocity of magnitude v, have a head-on-collision and both the vehicles stop after the collision. The time of the collision is 1 sec. Q. The vehicle, which experiences the smaller momentum change is ...................

Detailed Solution for Test: Force and Laws of Motion- Case Based Type Questions - Question 2

The vehicle, which experiences the smaller momentum change is Bus. The mass of Bus is heavier than the Van.

Test: Force and Laws of Motion- Case Based Type Questions - Question 3

### Direction: Read the following paragraph and choose the correct options to answer any four questions given below : A large bus and a van, both moving with a velocity of magnitude v, have a head-on-collision and both the vehicles stop after the collision. The time of the collision is 1 sec. Q. The vehicle, which experiences smaller force of impact is ....................

Detailed Solution for Test: Force and Laws of Motion- Case Based Type Questions - Question 3

The vehicle, which experiences smaller force of impact is Bus.

Test: Force and Laws of Motion- Case Based Type Questions - Question 4

Direction: Read the following paragraph and choose the correct options to answer any four questions given below :

A large bus and a van, both moving with a velocity of magnitude v, have a head-on-collision and both the vehicles stop after the collision. The time of the collision is 1 sec.

Q. The vehicle, which experiences the greater acceleration is .....................

Detailed Solution for Test: Force and Laws of Motion- Case Based Type Questions - Question 4
The vehicle, which experiences the greater acceleration is van.
Test: Force and Laws of Motion- Case Based Type Questions - Question 5

Direction: Read the following paragraph and choose the correct options to answer any four questions given below :

A large bus and a van, both moving with a velocity of magnitude v, have a head-on-collision and both the vehicles stop after the collision. The time of the collision is 1 sec.

Q. Under the same conditions, if there was a heavy truck heavier than the bus, in place of van, which one will be more affected?

Detailed Solution for Test: Force and Laws of Motion- Case Based Type Questions - Question 5
Under the same conditions, if there was a heavy truck heavier than the bus, in place of van, bus will be more affected
Test: Force and Laws of Motion- Case Based Type Questions - Question 6

Direction: Study the following diagram and choose the correct options to answer any four questions given below:

In the figure below the card is flicked with a push. It was observed that the card moves ahead while coin falls in glass. Q. Name the law which provides the definition of force.

Detailed Solution for Test: Force and Laws of Motion- Case Based Type Questions - Question 6

Correct option is D.

Test: Force and Laws of Motion- Case Based Type Questions - Question 7

Direction: Study the following diagram and choose the correct options to answer any four questions given below:

In the figure below the card is flicked with a push. It was observed that the card moves ahead while coin falls in glass. Q. Name the law involved in this case.

Detailed Solution for Test: Force and Laws of Motion- Case Based Type Questions - Question 7
Law of inertia is nothing but the first law of newton's and it gives a qualitative definition of force. Because force must push, pull and make objects move and bring them into motion also.
Test: Force and Laws of Motion- Case Based Type Questions - Question 8

Direction: Study the following diagram and choose the correct options to answer any four questions given below:

In the figure below the card is flicked with a push. It was observed that the card moves ahead while coin falls in glass. Q. Give reason for the above observation.

Detailed Solution for Test: Force and Laws of Motion- Case Based Type Questions - Question 8
The coin possesses inertia of rest, it resists the change and hence falls in the glass. Law of inertia is nothing but the first law of newton's and it gives a qualitative definition of force. Because force must push, pull and make objects move and bring them into motion also
Test: Force and Laws of Motion- Case Based Type Questions - Question 9

Direction: Study the following diagram and choose the correct options to answer any four questions given below:

In the figure below the card is flicked with a push. It was observed that the card moves ahead while coin falls in glass. Q. If the above coin is replaced by a heavy five rupee coin, what will be your observation. Give reason.

Detailed Solution for Test: Force and Laws of Motion- Case Based Type Questions - Question 9
If the above coin is replaced by a heavy five rupee coin then, heavy coin will possess more inertia so it will fall in tumbler.
Test: Force and Laws of Motion- Case Based Type Questions - Question 10

Direction: Study the following diagram and choose the correct options to answer any four questions given below:

In the figure below the card is flicked with a push. It was observed that the card moves ahead while coin falls in glass. Q. State Newton’s first law of motion.

Detailed Solution for Test: Force and Laws of Motion- Case Based Type Questions - Question 10
A body at rest remains at rest or, if in motion, remains in motion at constant velocity unless it is acted upon by an external unbalanced force.
Test: Force and Laws of Motion- Case Based Type Questions - Question 11

Direction: Observe the diagram and answer any four questions below:

Two forces F1 = 20 N and F2 = 30 N are acting on an object as shown in figure : Q. Identify the name of this extra force and its direction.

Detailed Solution for Test: Force and Laws of Motion- Case Based Type Questions - Question 11
(i) net force acting on them will be

10 N

as force is a vector quantity.

we generally subtract them…

(ii) the greater force is 30 N ,so the direction of motion will be that of the greater force.

(iii) an extra force is acting in the direction of F1 force which is balancing the two forces.

the magnitude of that force is 10 N.

Test: Force and Laws of Motion- Case Based Type Questions - Question 12

Direction: Observe the diagram and answer any four questions below:

Two forces F1 = 20 N and F2 = 30 N are acting on an object as shown in figure : Q. State the direction of the net force acting on the object ?

Detailed Solution for Test: Force and Laws of Motion- Case Based Type Questions - Question 12
See Newton's first law of motion. When there is a net force on an object, it causes the object to accelerate in the direction of the net force; this is not the same as the direction of the motion unless the object is going in a straight line
Test: Force and Laws of Motion- Case Based Type Questions - Question 13

Direction: Observe the diagram and answer any four questions below:

Two forces F1 = 20 N and F2 = 30 N are acting on an object as shown in figure : Q. Find the net force acting on the object.

Detailed Solution for Test: Force and Laws of Motion- Case Based Type Questions - Question 13
Net force acting on the object = F2 – F1 = 30 N – 20 N = 10 N
Test: Force and Laws of Motion- Case Based Type Questions - Question 14

Direction: Observe the diagram and answer any four questions below:

Two forces F1 = 20 N and F2 = 30 N are acting on an object as shown in figure : Q. If the body still does not move under the application of these forces, what can be the possible reason for this.

Detailed Solution for Test: Force and Laws of Motion- Case Based Type Questions - Question 14
Since the object is not moving, all forces are balanced.

The force is the force of friction. It acts between object (lower surface) and floor (upper surface). Its direction is that of F1.

Test: Force and Laws of Motion- Case Based Type Questions - Question 15

Direction: Observe the diagram and answer any four questions below:

Two forces F1 = 20 N and F2 = 30 N are acting on an object as shown in figure : Q. What is the unit of force?

Detailed Solution for Test: Force and Laws of Motion- Case Based Type Questions - Question 15
The SI unit of force is the newton, symbol N.

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## Physics for Class 9

16 videos|69 docs|56 tests