Momentum: Master the Concept and Ace Your Exams

Question 1

The SI unit of momentum is:

Accepted Answer

Kilogram meter per second (kg m/s)

Answer

Kilogram per second

Answer

Newton

Answer

Newton meter

Question 2

An object with a mass of 2 kg moves at a velocity of 3 m/s. Calculate its momentum:

Accepted Answer

6 kg m/s

Answer

8 kg m/s

Answer

10 kg m/s

Answer

12 kg m/s

Question 3

In an elastic collision, the total kinetic energy of the system:

Accepted Answer

Is conserved

Answer

Is not conserved

Answer

Increases

Answer

Decreases

Question 4

Impulse is calculated as:

Accepted Answer

Force x time

Answer

Mass x velocity

Answer

Momentum x time

Answer

Force x distance

Question 5

Which of the following is a scalar quantity?

Accepted Answer

Momentum

Answer

Velocity

Answer

Acceleration

Answer

Force

Question 6

Which of the following is a vector quantity?

Accepted Answer

Velocity

Answer

Mass

Answer

Time

Answer

Temperature

Question 7

Calculate the momentum of an object with a mass of 5 kg moving at a velocity of 10 m/s.

Accepted Answer

50 kg m/s

Answer

5 kg m/s^2

Answer

10 kg m/s

Answer

100 kg m/s^2

Question 8

In an elastic collision, which of the following physical quantities remain constant?

Accepted Answer

Momentum and kinetic energy

Answer

Momentum and gravitational potential energy

Answer

Kinetic energy and internal energy

Answer

Internal energy and gravitational potential energy

Question 9

What is the impulse imparted by a force of 10 N acting on an object for 2 seconds?

Accepted Answer

20 N⋅s

Answer

5 N⋅s

Answer

10 N⋅s

Answer

50 N⋅s

Question 10

Two cars, each with a mass of 1000 kg, are traveling at 20 m/s in opposite directions. The cars collide head-on. What is the velocity of each car immediately after the collision?

Accepted Answer

0 m/s

Answer

10 m/s

Answer

20 m/s

Answer

40 m/s

Question 11

Which of the following factors influence the momentum of an object?

Accepted Answer

Mass and velocity

Answer

Mass and volume

Answer

Velocity and temperature

Answer

Temperature and density

Question 12

At the highest point of its trajectory, the momentum of a vertically launched ball is:

Accepted Answer

Zero

Answer

Maximum

Answer

Minimum

Answer

Constant

Question 13

Calculate the momentum of a 1200 kg car traveling at 30 m/s:

Accepted Answer

36,000 kg m/s

Answer

-36,000 kg m/s

Answer

12,000 kg m/s

Answer

-12,000 kg m/s

Question 14

The formula for impulse is:

Accepted Answer

Impulse = Force × Time

Answer

Impulse = Momentum × Time

Answer

Impulse = Mass × Acceleration × Time

Answer

Impulse = Momentum × Velocity

Question 15

Which factor does NOT influence the momentum of a system?

Accepted Answer

Temperature of the system

Answer

Mass of the objects

Answer

Velocity of the objects

Answer

Number of objects in the system

Question 16

State the impulse-momentum theorem:

Accepted Answer

Impulse = Change in momentum

Answer

Momentum = Force × Time

Answer

Velocity = Displacement × Time

Answer

Acceleration = Rate of change of momentum

Question 17

An object of mass 'm' moving with velocity 'v' has a momentum of:

Accepted Answer

mv

Answer

mv/2

Answer

2mv

Answer

mv^2

Question 18

The SI unit of momentum is:

Accepted Answer

kilogram metre per second (kg m/s)

Answer

newton (N)

Answer

joule (J)

Answer

watt (W)

Question 19

Momentum is a conserved quantity. In the absence of external forces, it:

Accepted Answer

remains constant

Answer

can be created or destroyed

Answer

can be transformed into other forms of energy

Answer

decreases over time

Question 20

In an elastic collision, both momentum and:

Accepted Answer

kinetic energy

Answer

thermal energy

Answer

potential energy

Answer

electrical energy

Question 21

The impulse acting on an object equals the:

Accepted Answer

rate of change of momentum

Answer

force applied to the object

Answer

change in kinetic energy of the object

Answer

mass of the object

Question 22

A ball of mass 0.5kg is thrown with a velocity of 10m/s. The impulse applied to the ball is:

Accepted Answer

5Ns

Answer

10Ns

Answer

15Ns

Answer

20Ns

Question 23

The SI unit of momentum is:

Accepted Answer

kilogram-meter per second

Answer

kilogram per second

Answer

newton-second

Answer

joule

Question 24

A 10 N force is applied to an object for 2 seconds. Calculate the impulse imparted to the object:

Accepted Answer

20 N-s

Answer

5 N-s

Answer

10 N-s

Answer

40 N-s

Question 25

In a collision involving two objects, which quantity is conserved?

Accepted Answer

Momentum

Answer

Kinetic energy

Answer

Total energy

Answer

Mass

Question 26

A rocket releases exhaust gas at a speed of 1000 m/s. The exhaust gas expelled per second weighs 50 kg. Calculate the thrust produced by the rocket:

Accepted Answer

25 kN

Answer

50 kN

Answer

75 kN

Answer

100 kN

Question 27

In an inelastic collision, what becomes of the kinetic energy of the colliding objects?

Accepted Answer

It is partially converted to other forms of energy.

Answer

It remains the same.

Answer

It is completely lost.

Answer

It is doubled.

Question 28

An object is moving with a momentum of 10 kg m/s. If we double its velocity while keeping its mass the same, what will its new momentum be?

Accepted Answer

20 kg m/s

Answer

5 kg m/s

Answer

10 kg m/s

Answer

15 kg m/s

Question 29

An impulse of 10 Ns is applied to an object of mass 2 kg for 0.5 seconds. What is the change in the object's velocity?

Accepted Answer

2.5 m/s

Answer

1 m/s

Answer

5 m/s

Answer

10 m/s

Question 30

Which of the following factors does NOT affect momentum?

Accepted Answer

Height

Answer

Mass

Answer

Velocity

Answer

Direction

Question 31

Which type of collision conserves both momentum and kinetic energy?

Accepted Answer

Elastic collision

Answer

Inelastic collision

Answer

Perfectly inelastic collision

Answer

Superelastic collision

Question 32

What is the SI unit of momentum?

Accepted Answer

Newton-seconds

Answer

Kilograms per second

Answer

Joules

Answer

Watts

Question 33

What is the commonly used formula to calculate momentum?

Accepted Answer

Momentum (p) equals mass (m) multiplied by velocity (v)

Answer

Momentum (p) equals half of mass (m) multiplied by velocity squared (v^2)

Answer

Momentum (p) equals force (F) divided by time (t)

Answer

Momentum (p) equals mass (m) divided by velocity (v)

Question 34

Calculate the momentum of a car with a mass of 1000 kilograms traveling at a velocity of 10 meters per second.

Accepted Answer

1000 kg m/s

Answer

100 kg m/s

Answer

10 m/s

Answer

1000 m/s

Question 35

Which of the following is a direct consequence of the law of conservation of momentum?

Accepted Answer

In an isolated system, the total momentum remains constant.

Answer

In a collision, each object's momentum changes.

Answer

In an isolated system, the total kinetic energy remains constant.

Answer

In a collision, each object's velocity remains constant.

Question 36

What is the definition of impulse in physics?

Accepted Answer

The rate of change in momentum

Answer

The force applied to an object

Answer

The mass of an object

Answer

The velocity of an object

Question 37

A ball with a mass of 1 kilogram is thrown at a velocity of 10 meters per second. Calculate the impulse applied to the ball.

Accepted Answer

10 Ns

Answer

1 Ns

Answer

100 Ns

Answer

1000 Ns

Question 38

Which of the following is an example of an inelastic collision?

Accepted Answer

A car crashing into a wall

Answer

Two billiard balls colliding

Answer

A ball bouncing off a floor

Answer

A rocket taking off

Question 39

Which of the following factors influence the momentum of an object?

Accepted Answer

Both mass and velocity

Answer

Mass

Answer

Velocity

Answer

Neither mass nor velocity

Question 40

Which of the following is the SI unit of momentum, where mass is measured in kilograms (kg) and velocity is measured in meters per second (m/s)?

Accepted Answer

kg m/s

Answer

m/s

Answer

kg m

Answer

N

Question 41

Which of the following statements about the conservation of momentum is true?

Accepted Answer

The total momentum of a closed system remains constant.

Answer

Momentum can be created or destroyed.

Answer

The momentum of an object is always positive.

Answer

The momentum of an object changes when its velocity changes.

Question 42

Which of the following is the formula for impulse, where force is measured in Newtons (N) and time is measured in seconds (s)?

Accepted Answer

FΔt

Answer

mΔv

Answer

Δp/Δt

Answer

F/t

Question 43

A 0.5-kilogram ball is projected vertically upward with an initial velocity of 10 m/s. What is the ball's momentum at the maximum height of its trajectory?

Accepted Answer

0 kg m/s

Answer

-5.0 kg m/s

Answer

10.0 kg m/s

Answer

5.0 kg m/s

Question 44

A 1000-kilogram rocket traveling at 200 m/s releases 100 kilograms of mass backward at a velocity of 500 m/s relative to the rocket. Calculate the final velocity of the rocket.

Accepted Answer

190 m/s

Answer

210 m/s

Answer

100 m/s

Question 45

A ball with a mass of 2 kilograms is moving at a speed of 4 meters per second. What is the momentum of the ball?

Accepted Answer

8 kg m/s

Answer

16 kg m/s

Answer

2 kg m/s

Answer

4 kg m/s

Question 46

An object that is not moving has...

Accepted Answer

zero momentum

Answer

constant momentum

Answer

negative momentum

Answer

infinite momentum

Question 47

A 1000 kg car crashes head-on into a stationary 500 kg car. Which car experiences a larger change in momentum?

Accepted Answer

Both cars experience the same change in momentum.

Answer

The 1000 kg car

Answer

It depends on the speed of the 1000 kg car.

Answer

The 500 kg car

Question 48

A force of 20 Newtons is applied to a 5 kg object for 3 seconds. What is the impulse experienced by the object?

Accepted Answer

60 Ns

Answer

100 Ns

Answer

10 Ns

Answer

15 Ns

Question 49

A golfer hits a stationary golf ball. What is true about the momentum of the golf ball and the club immediately after impact?

Accepted Answer

The momentum of the club and the ball are equal and opposite.

Answer

The momentum of the club is zero.

Answer

The momentum of the ball is greater than the momentum of the club.

Answer

The momentum of the club is greater than the momentum of the ball.

Question 50

What is the relationship between impulse and change in momentum?

Accepted Answer

Impulse is equal to the change in momentum.

Answer

Impulse is proportional to the change in momentum.

Answer

There is no relationship between impulse and change in momentum.

Answer

Impulse is inversely proportional to the change in momentum.

Question 51

A heavy truck and a light car are traveling at the same speed. Which vehicle has the greater momentum?

Accepted Answer

The heavy truck

Answer

The light car

Answer

It depends on their mass.

Answer

Both have the same momentum.