Work and Energy: Interactive Learning Quizzes for Physics I

Question 1

A force of 50 Newtons is applied to an object that moves a distance of 10 meters. How much work is done by the force?

Accepted Answer

100 Joules

Answer

25 Joules

Answer

50 Joules

Answer

200 Joules

Question 2

Which of the following is NOT a form of energy?

Accepted Answer

Mass

Answer

Potential energy

Answer

Kinetic energy

Answer

Thermal energy

Question 3

Which of the following is the SI unit of power?

Accepted Answer

Watt

Answer

Joule

Answer

Newton

Answer

Kilogram

Question 4

A machine with an efficiency of 75% performs 100 Joules of work. How much energy was input into the machine?

Accepted Answer

125 Joules

Answer

75 Joules

Answer

100 Joules

Answer

150 Joules

Question 5

Which of the following is a conservative force?

Accepted Answer

Gravity

Answer

Friction

Answer

Air resistance

Answer

Tension

Question 6

Which of the following is the SI unit of work?

Accepted Answer

Joule

Answer

Newton

Answer

Watt

Answer

Kilogram-meter

Question 7

Which type of energy is stored due to the position or configuration of an object?

Accepted Answer

Potential energy

Answer

Kinetic energy

Answer

Thermal energy

Answer

Electrical energy

Question 8

Which of the following is a conservative force?

Accepted Answer

Gravity

Answer

Friction

Answer

Tension

Answer

Magnetic force

Question 9

Which of the following is the SI unit of power?

Accepted Answer

Watt

Answer

Joule

Answer

Newton

Answer

Meter

Question 10

A force of 50 Newtons is applied to a block of mass 10 kilograms, displacing it through a distance of 2 meters. What is the efficiency of the process if the actual work done is 75 Joules?

Accepted Answer

75%

Answer

25%

Answer

50%

Answer

100%

Question 11

The work done by a constant force acting on an object moving in a straight line equals:

Accepted Answer

Force multiplied by displacement

Answer

Force multiplied by velocity

Answer

Displacement multiplied by velocity

Answer

Velocity multiplied by acceleration

Question 12

An object slides down a frictionless inclined plane. The relationship between its potential energy at the top of the plane and its kinetic energy at the bottom is:

Accepted Answer

Potential energy is equal to kinetic energy

Answer

Potential energy is greater than kinetic energy

Answer

Potential energy is less than kinetic energy

Answer

There is no relationship

Question 13

A spring with a spring constant of 100 N/m is stretched by 0.1 meters. The elastic potential energy stored in the spring is:

Accepted Answer

0.5 J

Answer

1 J

Answer

5 J

Answer

10 J

Question 14

The SI unit of energy is:

Accepted Answer

Joule

Answer

Newton

Answer

Watt

Answer

Kilogram

Question 15

Which force among the following is non-conservative, and how does it differ from conservative forces?

Accepted Answer

Frictional force

Answer

Gravitational force

Answer

Electrostatic force

Answer

Spring force

Question 16

An object is dropped from a height 'h'. Using the principle of energy conservation, determine its velocity when it hits the ground in terms of 'h' and 'g' (acceleration due to gravity).

Accepted Answer

v = √(2gh)

Answer

v = gh

Answer

v = h/g

Answer

v = g/h

Question 17

Select the unit of energy in the International System of Units (SI).

Accepted Answer

Joule (J)

Answer

Newton (N)

Answer

Watt (W)

Answer

Coulomb (C)

Question 18

When an object is in motion, it possesses:

Accepted Answer

Kinetic energy

Answer

Potential energy

Answer

Thermal energy

Answer

Chemical energy

Question 19

Define the power of a machine.

Accepted Answer

Work done per unit time

Answer

Energy stored per unit time

Answer

Force applied per unit time

Answer

Distance traveled per unit time

Question 20

State the law of conservation of energy.

Accepted Answer

Energy can be transformed from one form to another

Answer

Energy can be created or destroyed

Answer

Energy can be lost or gained

Answer

Energy is always constant

Question 21

Which device converts electrical energy into mechanical energy?

Accepted Answer

Motor

Answer

Battery

Answer

Generator

Answer

Capacitor

Question 22

Which of the following is **not** a form of energy?

Accepted Answer

Displacement

Answer

Kinetic energy

Answer

Thermal energy

Answer

Magnetic energy

Question 23

The kinetic energy of an object depends on:

Accepted Answer

Both mass and velocity

Answer

Mass only

Answer

Velocity only

Answer

Neither mass nor velocity

Question 24

A force is applied to an object causing it to accelerate. If the applied force is increased, the object's:

Accepted Answer

Acceleration increases

Answer

Acceleration decreases

Answer

Acceleration remains the same

Answer

Velocity increases

Question 25

A ball with a mass of 2 kg is thrown vertically upward with an initial velocity of 10 m/s. What is the maximum height the ball will reach?

Accepted Answer

10 meters

Answer

5 meters

Answer

15 meters

Answer

20 meters

Question 26

Which of the following statements about energy is correct?

Accepted Answer

Energy can be transferred from one object to another.

Answer

Energy can be created or destroyed.

Answer

Energy is always constant.

Answer

Energy is only found in objects that are moving.

Question 27

Which of the following is NOT a unit of power?

Accepted Answer

Joules

Answer

Watts

Answer

Horsepower

Answer

Kilowatts

Question 28

A person does 100 Joules of work on a box by pushing it 10 meters across the floor. What is the power output of the person during this time?

Accepted Answer

100 Watts

Answer

10 Watts

Answer

1000 Watts

Answer

10000 Watts

Question 29

Which of the following is a conservative force?

Accepted Answer

Gravity

Answer

Friction

Answer

Tension

Answer

Air resistance

Question 30

Which of the following is a form of mechanical energy?

Accepted Answer

Kinetic energy

Answer

Thermal energy

Answer

Electrical energy

Answer

Sound energy

Question 31

A box of mass 10 kg is pushed across a frictionless floor with a constant force of 20 N. If the box is displaced by 5 meters, calculate the work done on the box.

Accepted Answer

100 J

Answer

50 J

Answer

150 J

Answer

200 J

Question 32

A ball is thrown vertically upward with an initial velocity of 10 m/s. Assuming negligible air resistance, calculate the maximum height reached by the ball.

Accepted Answer

10.2 m

Answer

5.1 m

Answer

20.4 m

Answer

15.3 m

Question 33

A 2 kg object is moving with a speed of 4 m/s. Calculate its kinetic energy.

Accepted Answer

16 J

Answer

24 J

Answer

32 J

Answer

8 J

Question 34

A roller coaster car starts from rest at the top of a hill and rolls down to the bottom. Identify the energy transformation that occurs during this process.

Accepted Answer

Potential energy is converted into kinetic energy.

Answer

Heat energy is converted into potential energy.

Answer

Kinetic energy is converted into potential energy.

Answer

Potential energy is converted into heat energy.

Question 35

Which of the following is NOT a form of energy?

Accepted Answer

Temperature

Answer

Heat

Answer

Light

Answer

Sound

Question 36

A 10 kg mass is lifted vertically through a height of 2 meters. Calculate the work done against the gravitational force.

Accepted Answer

196 J

Answer

294 J

Answer

98 J

Answer

392 J

Question 37

A force of 10 N acts on a 2 kg mass, causing it to accelerate across a frictionless surface. If the mass starts from rest and moves 5 meters, determine its final kinetic energy.

Accepted Answer

25 J

Answer

100 J

Answer

10 J

Answer

50 J

Question 38

Which of the following is NOT a unit of energy?

Accepted Answer

Newton

Answer

Electronvolt

Answer

Calorie

Answer

British thermal unit

Question 39

A spring with a spring constant of 100 N/m is compressed by 0.2 meters. Calculate the potential energy stored in the spring.

Accepted Answer

2 J

Answer

8 J

Answer

4 J

Answer

1 J

Question 40

A ball is thrown vertically upwards. Neglecting air resistance, at what point in its trajectory is the ball's potential energy equal to twice its kinetic energy?

Accepted Answer

One-third of the way to its maximum height

Answer

Two-thirds of the way to its maximum height

Answer

Halfway to its maximum height

Answer

At its maximum height

Question 41

A 50 kg roller coaster car starts from rest at a height of 20 meters. Neglecting friction, what is the car's speed at the bottom of the hill?

Accepted Answer

20 m/s

Answer

28 m/s

Answer

14 m/s

Answer

10 m/s

Question 42

A machine performs 100 J of work in 5 seconds. What is the power output of the machine?

Accepted Answer

20 W

Answer

500 W

Answer

5 W

Answer

50 W

Question 43

Which statement best describes a non-conservative force?

Accepted Answer

The work done by the force depends on the path taken.

Answer

The force remains constant in magnitude and direction.

Answer

The force always acts in the direction of motion.

Answer

The work done by the force is independent of the path taken.

Question 44

A motor lifts a 100 kg object vertically at a constant velocity of 2 m/s.  What is the power output of the motor?

Accepted Answer

1960 W

Answer

200 W

Answer

490 W

Answer

980 W

Question 45

What does the area under a force-displacement graph represent?

Accepted Answer

The work done by the force.

Answer

The potential energy of the object.

Answer

The kinetic energy of the object.

Answer

The power output.

Question 46

An object of mass 5 kg is lifted vertically a distance of 10 m. What is the work done against gravity?

Accepted Answer

490 J

Answer

4900 J

Answer

4.9 J

Answer

49 J

Question 47

A car with a mass of 1000 kg travels at a velocity of 30 m/s. What is the kinetic energy of the car?

Accepted Answer

450 kJ

Answer

45 kJ

Answer

4500 kJ

Answer

900 kJ

Question 48

A spring with a spring constant of 200 N/m is stretched 0.5 m from its equilibrium position. What is the potential energy stored in the spring?

Accepted Answer

25 J

Answer

100 J

Answer

200 J

Answer

50 J

Question 49

A ball is thrown vertically upward with an initial velocity of 20 m/s. Neglecting air resistance, what is the maximum height the ball reaches?

Accepted Answer

20 m

Answer

10 m

Answer

80 m

Answer

40 m

Question 50

A person exerts a constant force of 100 N on a crate, displacing it 5 meters horizontally over 10 seconds. What is the average power delivered by the person?

Accepted Answer

50 W

Answer

10 W

Answer

100 W

Answer

500 W

Question 51

A light bulb consumes 100 W of power and operates for 5 hours. How much energy does the light bulb use in Joules?

Accepted Answer

1,800,000 J

Answer

1,800 J

Answer

180,000 J

Answer

18,000 J

Question 52

A pendulum swings from side to side. At the bottom of its swing, it has a maximum kinetic energy of 20 J. What is its maximum potential energy at the top of its swing?

Accepted Answer

20 J

Answer

0 J

Answer

10 J

Answer

40 J

Question 53

A roller coaster car is at the top of a hill. As it rolls down the hill, its kinetic energy increases. What happens to its potential energy?

Accepted Answer

Decreases

Answer

Remains the same

Answer

Increases

Answer

Becomes negative

Question 54

A car brakes to a stop. What happens to the kinetic energy of the car?

Accepted Answer

Converted to heat and sound

Answer

Stored as potential energy

Answer

Transferred to the ground

Answer

Destroyed

Question 55

A person is doing work by pushing a lawnmower across the lawn. The lawnmower is not moving. What is the power delivered by the person?

Accepted Answer

Zero

Answer

Equal to the distance moved

Answer

Equal to the force applied

Answer

Equal to the weight of the lawnmower