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# Test: Impulse & Newton’s Third Law

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## 20 Questions MCQ Test Physics Class 11 | Test: Impulse & Newton’s Third Law

Test: Impulse & Newton’s Third Law for NEET 2023 is part of Physics Class 11 preparation. The Test: Impulse & Newton’s Third Law questions and answers have been prepared according to the NEET exam syllabus.The Test: Impulse & Newton’s Third Law MCQs are made for NEET 2023 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Impulse & Newton’s Third Law below.
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Test: Impulse & Newton’s Third Law - Question 1

### A force which acts for a small time and also varies with time is called:

Detailed Solution for Test: Impulse & Newton’s Third Law - Question 1

A large amount of force acting on an object for a short interval of time is called impulse or impulsive force. Numerically impulse is the product of force and time. Impulse of an object is equal to the change in momentum of the object.

Test: Impulse & Newton’s Third Law - Question 2

### If two ends of a spring balance are pulled by a force of 10N, then the reading of the spring balance will be

Detailed Solution for Test: Impulse & Newton’s Third Law - Question 2

Spring balance works on action reaction principle. Hence, according to Newton’s third law the force measured by Spring balance will be 10 N.

Test: Impulse & Newton’s Third Law - Question 3

### Action and reaction do not cancel each other out because

Detailed Solution for Test: Impulse & Newton’s Third Law - Question 3

The important thing to notice is that action and reaction forces act on different objects in the interaction. Two equal and opposite forces acting on the same object do not make an action-reaction pair! This is why the two opposing forces don't cancel out.

Test: Impulse & Newton’s Third Law - Question 4

The force exerted by the floor of an elevator on the foot of a person is _______ the weight of the person if the elevator is going up and speeding up.

Detailed Solution for Test: Impulse & Newton’s Third Law - Question 4

The force exerted by the floor of an elevator on the foot of a person is more than the weight of the person if the elevator is going up and speeding up.

Test: Impulse & Newton’s Third Law - Question 5

A man weighs 70 kg. He stands on a weighing scale in a lift which is moving upwards with an acceleration of 5ms2.What would be the reading on the scale? (g=10 ms2)

Detailed Solution for Test: Impulse & Newton’s Third Law - Question 5

As the moving elevator is a non inertial frame hence newton's laws can’t be applied directly to it. So to apply Newton's laws we need to add a pseudo force to the man's body equal to mass times the acceleration of lift in the opposite direction to that of acceleration. Thus the balancing normal force is equal to the weight of the man +  mass times the acceleration which is,
Reading = Normal force = 700 + 70 x 5
= 700 + 350
= 1050 N

Test: Impulse & Newton’s Third Law - Question 6

A ball of mass 150 gram moving at velocity of 15 metre per second is brought to rest by a player in 0.1 second calculate the force acting on the hands of player

Detailed Solution for Test: Impulse & Newton’s Third Law - Question 6

Solution :- F = ma

F = m ( v-u /t )

here u = 0

F = m v /t

F = 0.150 x 15 / 0.1

F = 2.25 / 0.1

F = 22.5 N

Test: Impulse & Newton’s Third Law - Question 7

An average force of 100N acts on a body for 1s. What is the impulse due to the force?

Detailed Solution for Test: Impulse & Newton’s Third Law - Question 7

We know that Impulse due to force, I = FΔt
As F = 100N
And Δt = 1sec
We get I = 100 Ns

Test: Impulse & Newton’s Third Law - Question 8

A ball weighing 0.01kg hits a hard surface vertically with a speed of 5m/s and rebounds with the same speed. The ball remains in contact with the surface for 0.01s. The average force exerted by the surface on the ball is

Detailed Solution for Test: Impulse & Newton’s Third Law - Question 8

Since impulse I = F x Δt

And also Impulse I = Δp (i.e. change in linear momentum)

Change in momentum

= 0.01 x 5 – (-5)

= 0.10 N s

Impulse = 0.10 N s

Therefore 0.10 = F x 0.01

Or F = 10 N

Test: Impulse & Newton’s Third Law - Question 9

The principle of working of a rocket is based on

Detailed Solution for Test: Impulse & Newton’s Third Law - Question 9

Rocket works on the principle of conservation of momentum. Rocket ejaculates gases in backward direction which creates momentum of the gases backwards and thus by conservation of momentum, the rocket gets a momentum in the forward direction making it to move forward.

Test: Impulse & Newton’s Third Law - Question 10

A bus can accelerate on a horizontal road due the force exerted by

Detailed Solution for Test: Impulse & Newton’s Third Law - Question 10

Engine of the bus exerts force on the wheel is frictional force which opposes the bus to move forward ( acts opposite to the direction of motion of the body). Road also exert equal force on the wheel which pushes the bus forward

Test: Impulse & Newton’s Third Law - Question 11

The product of forceand the duration of time for which it acts on a body is equal to the

Detailed Solution for Test: Impulse & Newton’s Third Law - Question 11

Solution :- Impulse I = Fdt

Also force F= mdv/dt

​So, I = mdv/dt dt = mdv

= m(v2 −v1)

= mv2 − mv1

​=p2 − p1 = change in momentum

Test: Impulse & Newton’s Third Law - Question 12

A block is placed on the table. What is the angle between the action of the block on the table and reaction of the table on the block?

Detailed Solution for Test: Impulse & Newton’s Third Law - Question 12

According to Newton's 3 rd law, every action and reaction have the same magnitude and opposite direction. So the angle between them should be 180°.

Test: Impulse & Newton’s Third Law - Question 13

The SI unit of impulse is

Detailed Solution for Test: Impulse & Newton’s Third Law - Question 13

Impulse applied to an object produces an equivalent vector change in its linear momentum, also in the same direction. The SI unit of impulse is the newton second (N⋅s), and the dimensionally equivalent unit of momentum is the kilogram meter per second (kg⋅m/s).

Test: Impulse & Newton’s Third Law - Question 14

From the magnitude of impulse, it is possible to find the change in linear momentum because

Detailed Solution for Test: Impulse & Newton’s Third Law - Question 14

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. In a collision, the impulse experienced by an object is always equal to the momentum change.

Test: Impulse & Newton’s Third Law - Question 15

A boy kicked a stone and got hurt. Which property of stone is responsible?

Detailed Solution for Test: Impulse & Newton’s Third Law - Question 15

Solution :- "The property due to which we hurt when a stone is kicked is the Newton's third law of motion.

"Newton's third law of motion" states that each and every action, we get an "equal and opposite" reaction.

Test: Impulse & Newton’s Third Law - Question 16

A man in the lift weighs more, when the lift

Detailed Solution for Test: Impulse & Newton’s Third Law - Question 16

In upward direction, acceleration becomes = g+a
N = m(g+a)

Test: Impulse & Newton’s Third Law - Question 17

A machine gun has a mass of 20 kg fires 35 g bullets at the rate of 400 bullets per second with a speed of 400ms-1 .What force must be applied to the gun to keep in the position?

Detailed Solution for Test: Impulse & Newton’s Third Law - Question 17

To conserve the momentum each time a single bullet is fired,
the reverse speed gained by the gun from one bullet is
V = 400 X .035 / 20
= 0.7 m/s
Thus total speed gained in a second is = 0.7 X 400 = 280 m/s
As total speed is gained in one second only the acceleration produced = 280 m/s2
Thus total force applied on the gun by the bullets = 20 x 280
= 5600 N

Test: Impulse & Newton’s Third Law - Question 18

Which law says that every force is accompanied by an equal and opposite force?

Detailed Solution for Test: Impulse & Newton’s Third Law - Question 18

"Every action has an equal and opposite reaction” -Newton's 3rd Law

Test: Impulse & Newton’s Third Law - Question 19

A bomb of mass 16kg at rest, explodes into two pieces of masses 4kg and 12kg. After explosion, the velocity of the 12kg mass is 4m/s. What is the velocity of the 4kg piece?

Detailed Solution for Test: Impulse & Newton’s Third Law - Question 19

Simply by conserving the momentum of the system we get that,
0 (initial momentum) = 12 x 4 + 4 x v (final momentum)
Thus we get v = -12 m/s

Test: Impulse & Newton’s Third Law - Question 20

The dimensional formula for impulse is

Detailed Solution for Test: Impulse & Newton’s Third Law - Question 20

We know that I = P, where P is momentum
As subtracting initial momentum from the final momentum won't affect its unit, we get unit if I is the same as that of P.

## Physics Class 11

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## Physics Class 11

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