Dynamics: Master Motion and Forces with Interactive Quizzes

Question 1

Which fundamental principle in classical mechanics was introduced by Newton?

Accepted Answer

Law of Universal Gravitation

Answer

Coulomb's Law

Answer

Bernoulli's Principle

Answer

Carnot's Theorem

Question 2

For an object of mass 'm' moving with a velocity 'v', its linear momentum is given by:

Accepted Answer

mv

Answer

mv^2

Answer

1/2mv^2

Answer

m/v

Question 3

The coefficient of restitution is a measure of:

Accepted Answer

Elasticity of a collision

Answer

Inelasticity of a collision

Answer

Momentum of a collision

Answer

Energy of a collision

Question 4

Newton's second law of motion states that the force acting on an object is:

Accepted Answer

directly proportional to its mass and acceleration

Answer

inversely proportional to its mass and acceleration

Answer

directly proportional to its acceleration and inversely proportional to its mass

Answer

inversely proportional to its acceleration and directly proportional to its mass

Question 5

What is the SI unit of power?

Accepted Answer

Watt

Answer

Joule

Answer

Newton

Answer

Kilogram

Question 6

Which of the following is a vector quantity?

Accepted Answer

Acceleration

Answer

Speed

Answer

Mass

Answer

Energy

Question 7

Newton's third law of motion states that:

Accepted Answer

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

Answer

The rate of change of momentum is proportional to the applied force.

Answer

Force is directly proportional to mass and acceleration.

Answer

Energy cannot be created or destroyed.

Question 8

State Newton's first law of motion.

Accepted Answer

An object at rest will remain 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.

Answer

The work done on an object is equal to the change in its kinetic energy.

Question 9

Identify which of the following is a vector quantity:

Accepted Answer

Displacement

Answer

Speed

Answer

Temperature

Answer

Mass

Question 10

Specify the unit of power.

Accepted Answer

Watt

Answer

Joule

Answer

Newton

Answer

Meter per second

Question 11

Which of the following is the mathematically correct form of Newton's second law of motion?

Accepted Answer

F = m × a

Answer

a = F × m

Answer

F = a × m

Answer

m = a × F

Question 12

A car of mass 1000 kg is traveling at a velocity of 10 m/s. Calculate the momentum of the car.

Accepted Answer

10,000 kg m/s

Answer

1000 kg m/s

Answer

100 kg m/s

Answer

10 kg m/s

Question 13

In the International System of Units (SI), what is the unit of energy?

Accepted Answer

Joule

Answer

Newton

Answer

Pascal

Answer

Watt

Question 14

Which formula correctly defines power?

Accepted Answer

P = W / t

Answer

P = F × v

Answer

P = m × a

Answer

P = E / t

Question 15

Identify the conservative force from the following list:

Accepted Answer

Gravity

Answer

Friction

Answer

Tension

Answer

Air resistance

Question 16

Which of the following is a unit of energy?

Accepted Answer

Joule

Answer

Newton

Answer

Watt

Answer

Pascal

Question 17

A car of mass 1000 kilograms is travelling at a speed of 20 meters per second. What is its kinetic energy?

Accepted Answer

400 kilojoules

Answer

100 kilojoules

Answer

200 kilojoules

Answer

800 kilojoules

Question 18

Newton's second law of motion states that:

Accepted Answer

Force is directly proportional to acceleration.

Answer

Mass is inversely proportional to acceleration.

Answer

Momentum is conserved.

Answer

Kinetic energy is proportional to velocity cubed.

Question 19

An object with a mass of 3 kg is moving with a velocity of 4 m/s. Calculate its momentum.

Accepted Answer

12 kg m/s

Answer

7 kg m/s

Answer

18 kg m/s

Answer

24 kg m/s

Question 20

Which of the following is a scalar quantity?

Accepted Answer

Mass

Answer

Velocity

Answer

Acceleration

Answer

Energy

Question 21

The SI unit of power is the:

Accepted Answer

Watt

Answer

Newton

Answer

Joule

Answer

Ampere

Question 22

For an object to be in equilibrium, which of the following conditions is necessary?

Accepted Answer

The resultant force acting on the object is zero

Answer

The object is stationary

Answer

The object is moving at constant speed

Answer

The object has a positive acceleration

Question 23

Classify the following as conservative or non-conservative: Gravity

Accepted Answer

Conservative

Answer

Non-conservative

Question 24

Calculate the kinetic energy of a car with a mass of 1000 kg moving at a speed of 20 m/s.

Accepted Answer

200 kJ

Answer

100 kJ

Answer

300 kJ

Answer

400 kJ

Question 25

Within the SI system of units, which unit is fundamental?

Accepted Answer

Newton

Answer

Celsius

Answer

Pound

Answer

Inch

Question 26

Which of the following is NOT a consequence of Newton's Third Law of Motion?

Accepted Answer

The heavier an object, the greater its force.

Answer

Every action has an equal and opposite reaction.

Answer

Forces always occur in pairs.

Answer

Forces acting on an object can cancel each other out.

Question 27

A car is travelling at a constant speed of 20 m/s on a level road. What is the net force acting on the car?

Accepted Answer

0 N

Answer

20 N

Answer

40 N

Answer

80 N

Question 28

Which of the following is the SI unit of power?

Accepted Answer

Watt

Answer

Joule

Answer

Newton

Answer

Kilogram

Question 29

According to Newton's first law of motion, an object at rest will remain at rest unless acted upon by an unbalanced force.

Accepted Answer

True

Answer

False

Question 30

Momentum is a vector quantity that describes the amount of motion of an object.

Accepted Answer

True

Answer

False

Question 31

The work done on an object is equal to the change in its kinetic energy.

Accepted Answer

True

Answer

False

Question 32

Power is the rate at which work is done.

Accepted Answer

True

Answer

False

Question 33

When a projectile reaches its maximum height, its velocity is zero.

Accepted Answer

True

Answer

False

Question 34

Kinetic energy is directly proportional to the square of the object's momentum.

Accepted Answer

True

Answer

False

Question 35

**Question:** A spring with a spring constant of 100 N/m is stretched by 5 cm. Calculate the energy stored in the spring.

Accepted Answer

0.125 J

Answer

0.25 J

Answer

0.5 J

Answer

1 J

Question 36

A car of mass 1000 kg travels at a constant speed of 30 m/s. What is the net force acting on the car?

Accepted Answer

0 N

Answer

1000 N

Answer

3000 N

Question 37

A body of mass 2 kg is acted upon by a force of 5 N for 3 seconds. What is the change in momentum of the body?

Accepted Answer

15 kg m/s

Answer

10 kg m/s

Answer

5 kg m/s

Answer

20 kg m/s

Question 38

A 50 kg box is pushed across a horizontal floor with a force of 100 N. The coefficient of kinetic friction between the box and the floor is 0.2. Determine the acceleration of the box.

Accepted Answer

1 m/s²

Answer

0 m/s²

Answer

2 m/s²

Answer

0.5 m/s²

Question 39

A roller coaster car with a mass of 1000 kg is at the top of a hill 20 meters high. Calculate the car's potential energy at the top of the hill.

Accepted Answer

196,000 J

Answer

98,000 J

Answer

10,000 J

Answer

20,000 J

Question 40

A 1 kg mass is moving at a velocity of 5 m/s. What is the momentum of the mass?

Accepted Answer

5 kg m/s

Answer

2.5 kg m/s

Answer

10 kg m/s

Answer

0 kg m/s

Question 41

A machine does 1000 J of work in 10 seconds. What is the power output of the machine?

Accepted Answer

100 W

Answer

1000 W

Answer

10,000 W

Answer

10 W

Question 42

A 10 kg object is lifted vertically upwards at a constant speed of 2 m/s. What is the power required to lift the object?

Accepted Answer

196 W

Answer

98 W

Answer

20 W

Answer

100 W

Question 43

Two objects of equal mass collide head-on. Before the collision, one object is moving at 10 m/s and the other is stationary. After the collision, both objects move together. What is the speed of the two objects after the collision?

Accepted Answer

5 m/s

Answer

0 m/s

Answer

10 m/s

Question 44

A 2 kg object is moving at 5 m/s. What is the object's kinetic energy?

Accepted Answer

25 J

Answer

50 J

Answer

10 J

Answer

100 J

Question 45

A force of 10 N acts on an object for 5 seconds. What is the impulse of the force?

Accepted Answer

50 Ns

Answer

25 Ns

Answer

2 Ns

Answer

15 Ns

Question 46

A 10 kg object is lifted vertically 2 meters. What is the work done against gravity?

Accepted Answer

196 J

Answer

98 J

Answer

392 J

Answer

294 J

Question 47

A 50 kg object is moving at a constant velocity of 10 m/s. What is the net force acting on the object?

Accepted Answer

0 N

Answer

500 N

Answer

50 N

Answer

100 N

Question 48

A car accelerates from rest to a speed of 20 m/s in 5 seconds. What is the car's acceleration?

Accepted Answer

4 m/s²

Answer

10 m/s²

Answer

5 m/s²

Answer

2 m/s²

Question 49

A 2 kg object is dropped from a height of 10 meters. What is the object's potential energy just before it hits the ground?

Accepted Answer

196 J

Answer

98 J

Answer

392 J

Answer

294 J

Question 50

A 1000 kg car is traveling at 20 m/s. What is the car's momentum?

Accepted Answer

20,000 kg m/s

Answer

10,000 kg m/s

Answer

40,000 kg m/s

Answer

5,000 kg m/s

Question 51

A 50 kg object is moving at a constant velocity of 10 m/s. What is the object's kinetic energy?

Accepted Answer

2500 J

Answer

1000 J

Answer

1250 J

Answer

5000 J

Question 52

A 100 N force is applied to a 5 kg object, causing it to accelerate. What is the object's acceleration?

Accepted Answer

20 m/s²

Answer

5 m/s²

Answer

10 m/s²

Answer

25 m/s²

Question 53

A machine lifts a 200 kg object 5 meters in 10 seconds. What is the power output of the machine?

Accepted Answer

980 W

Answer

1960 W

Answer

490 W