Dynamics: Master Motion and Forces with Interactive Quizzes

Question 1

Which of the following statements is NOT a law of motion proposed by Isaac Newton?

Accepted Answer

Momentum is conserved in a closed system.

Answer

An object at rest remains at rest unless acted on by an external force.

Answer

The acceleration of an object is directly proportional to the net force acting on it.

Answer

For every action, there is an equal and opposite reaction.

Question 2

A car of mass 1000 kg is traveling at a speed of 20 m/s. Calculate its momentum.

Accepted Answer

2000 kg m/s

Answer

500 kg m/s

Answer

1000 kg m/s

Answer

4000 kg m/s

Question 3

Determine the correct formula for calculating the centripetal force acting on an object moving in a circle.

Accepted Answer

F = mv²/r

Answer

F = mv²

Answer

F = mr²v

Answer

F = mr²v²

Question 4

According to Newton's second law of motion, the acceleration of an object is directly proportional to which quantity?

Accepted Answer

Force

Answer

Mass

Answer

Weight

Answer

Velocity

Question 5

Select the correct unit for measuring momentum.

Accepted Answer

Kilograms per second

Answer

Joules

Answer

Newtons

Answer

Watts

Question 6

In a closed system, various forms of energy can be transformed into each other. Which of the following is NOT considered a form of mechanical energy?

Accepted Answer

Electrical energy

Answer

Kinetic energy

Answer

Potential energy

Answer

Thermal energy

Question 7

Choose the quantity that is a vector.

Accepted Answer

Acceleration

Answer

Speed

Answer

Temperature

Answer

Mass

Question 8

Identify the conservative force among the following:

Accepted Answer

Gravity

Answer

Friction

Answer

Air resistance

Answer

Tension

Question 9

Which of the following is a unit of work and energy?

Accepted Answer

Joule

Answer

Newton

Answer

Watt

Answer

Kilogram

Question 10

Which of the following is a scalar quantity?

Accepted Answer

Temperature

Answer

Velocity

Answer

Displacement

Answer

Force

Question 11

Identify the vector quantity.

Accepted Answer

Displacement

Answer

Time

Answer

Speed

Answer

Mass

Question 12

Calculate the velocity of a ball just before it hits the ground after being dropped from a height of 10 m.

Accepted Answer

14 m/s

Answer

5 m/s

Answer

10 m/s

Answer

20 m/s

Question 13

A vehicle with a mass of 1000 kg is moving at 10 m/s when its brakes are applied, resulting in a force of -500 N acting on the car. Calculate the car's resulting acceleration.

Accepted Answer

-0.5 m/s²

Answer

-0.05 m/s²

Answer

-5 m/s²

Answer

-50 m/s²

Question 14

Which formula accurately represents work?

Accepted Answer

Force multiplied by distance

Answer

Force multiplied by velocity

Answer

Mass multiplied by acceleration

Answer

Energy multiplied by power

Question 15

Which of the following is a scalar quantity?

Accepted Answer

Energy

Answer

Velocity

Answer

Acceleration

Answer

Force

Question 16

According to Newton's second law of motion, explain how the acceleration of an object relates to the net force acting on it.

Accepted Answer

The acceleration of an object is directly proportional to the net force acting on it.

Answer

The acceleration of an object is inversely proportional to the net force acting on it.

Answer

The acceleration of an object is independent of the net force acting on it.

Answer

The acceleration of an object is equal to the net force acting on it.

Question 17

A ball is projected vertically upward with a velocity of 10 m/s. At the highest point of its trajectory, its velocity is:

Accepted Answer

0 m/s

Answer

10 m/s

Answer

20 m/s

Answer

Insufficient information to determine

Question 18

Which of the following forces is a conservative force?

Accepted Answer

Gravitational force

Answer

Frictional force

Answer

Normal force

Answer

Tension force

Question 19

Which of the following units is used to express momentum?

Accepted Answer

Newton

Answer

Joule

Answer

Kilogram

Answer

Watt

Question 20

Provide an example of a centripetal force that acts on an object moving in a circular path.

Accepted Answer

Tension force in a string

Answer

Gravitational force between the Earth and the Moon

Answer

Frictional force between a car and the road

Answer

Magnetic force between two magnets

Question 21

What is the value of acceleration due to gravity on the Earth's surface?

Accepted Answer

9.8 m/s^2

Answer

19.6 m/s^2

Answer

39.2 m/s^2

Answer

78.4 m/s^2

Question 22

A force of 10 N is applied to an object of mass 2 kg for 5 seconds. Determine the impulse acting on the object.

Accepted Answer

20 Ns

Answer

10 Ns

Answer

50 Ns

Answer

100 Ns

Question 23

Which of the following is NOT a fundamental force?

Accepted Answer

Frictional force

Answer

Gravitational force

Answer

Magnetic force

Answer

Elastic force

Question 24

Identify the SI unit of power.

Accepted Answer

Watt

Answer

Joule

Answer

Newton

Answer

Metre per second

Question 25

Identify the statement that is NOT a law of motion.

Accepted Answer

Law of Conservation of Energy

Answer

Newton's first law

Answer

Newton's second law

Answer

Newton's third law

Question 26

Identify the scalar quantity from the following options.

Accepted Answer

Mass

Answer

Velocity

Answer

Force

Answer

Power

Question 27

Write down the formula for Newton's second law of motion.

Accepted Answer

F = ma

Answer

P = W/t

Answer

E = 1/2mv^2

Answer

v = u + at

Question 28

Define a free-body diagram.

Accepted Answer

A diagram representing all forces acting on an object

Answer

A diagram depicting the motion of an object

Answer

A diagram showing the energy of an object

Answer

A diagram representing the momentum of an object

Question 29

An object is thrown vertically upwards with an initial velocity of 10 m/s. Determine its maximum height.

Accepted Answer

12.5 m

Answer

5 m

Answer

10 m

Answer

20 m

Question 30

A spring with a spring constant of 100 N/m is stretched by 0.2 m. Determine the potential energy stored in the spring.

Accepted Answer

2 J

Answer

1 J

Answer

4 J

Answer

8 J

Question 31

Which of the following is not a fundamental force?

Accepted Answer

Frictional force

Answer

Gravitational force

Answer

Electrostatic force

Answer

Magnetic force

Question 32

Which law of motion describes the relationship between action and reaction forces?

Accepted Answer

Newton's Third Law

Answer

Newton's First Law

Answer

Newton's Second Law

Answer

Law of Conservation of Energy

Question 33

Identify the SI unit of power.

Accepted Answer

Watt

Answer

Joule

Answer

Newton

Answer

Meter per second

Question 34

A car with a mass of 1000 kg moves at a constant velocity of 10 m/s. According to Newton's first law of motion, what is the net force acting on the car?

Accepted Answer

0 N

Answer

10 N

Answer

100 N

Answer

1000 N

Question 35

Two bodies of masses 10 kg and 20 kg are moving with velocities of 5 m/s and 2 m/s, respectively. What is the velocity of the center of mass of the system?

Accepted Answer

3.33 m/s

Answer

4.17 m/s

Answer

2.5 m/s

Answer

5 m/s

Question 36

A particle of mass 1 kg is moving in a circle of radius 2 m with a speed of 5 m/s. What is the centripetal force acting on the particle?

Accepted Answer

25 N

Answer

12.5 N

Answer

37.5 N

Answer

50 N