Work, Power, and Energy in Sport: Interactive Learning Quizzes

Question 1

An engine with a power output of 100 W does 200 J of work in 2 seconds. What is its efficiency?

Accepted Answer

50%

Answer

25%

Answer

75%

Answer

100%

Question 2

Which of the following does NOT affect the mechanical work done on an object?

Accepted Answer

Speed of the object

Answer

Displacement of the object

Answer

Force applied to the object

Answer

Angle between force and displacement

Question 3

The energy stored in a stretched rubber band is:

Accepted Answer

Potential

Answer

Kinetic

Answer

Electrical

Answer

Thermal

Question 4

Which of the following is NOT a way to increase machine efficiency?

Accepted Answer

Increasing the input power

Answer

Reducing friction

Answer

Improving the design to minimize energy loss

Answer

Using a more powerful motor

Question 5

A 100 kg athlete jumps vertically with a take-off velocity of 5 m/s. What is the maximum height they reach?

Accepted Answer

2.50 m

Answer

1.25 m

Answer

5.00 m

Answer

10.00 m

Question 6

The work done by a force is:

Accepted Answer

Zero if the force is perpendicular to the displacement

Answer

Always positive

Answer

Always negative

Answer

Equal to the force applied

Question 7

Which of the following is the SI unit of power?

Accepted Answer

Watt

Answer

Joule

Answer

Newton

Answer

Meter

Question 8

Which of the following is NOT a factor that affects mechanical work?

Accepted Answer

Object's mass

Answer

Force applied

Answer

Distance moved

Answer

Direction of force

Question 9

Which type of energy is stored within an object due to its position or height?

Accepted Answer

Potential energy

Answer

Kinetic energy

Answer

Chemical energy

Answer

Thermal energy

Question 10

Which of the following sports typically requires the highest peak power output?

Accepted Answer

Weightlifting

Answer

Marathon running

Answer

Cycling

Answer

Golf

Question 11

The force-time graph for a muscle contraction shows the area under the curve represents:

Accepted Answer

Work done by the muscle

Answer

Power generated by the muscle

Answer

Efficiency of the muscle

Answer

Energy stored in the muscle

Question 12

In the context of sports science, energy expenditure is primarily measured in:

Accepted Answer

Calories

Answer

Joules

Answer

Watts

Answer

Newtons

Question 13

Which of the following is a type of energy associated with the motion of an object?

Accepted Answer

Kinetic energy

Answer

Potential energy

Answer

Chemical energy

Answer

Thermal energy

Question 14

Which of the following is the SI unit of work?

Accepted Answer

Joule

Answer

Watt

Answer

Newton

Answer

Kilogram

Question 15

A cyclist riding at a consistent speed of 10 m/s exerts a force of 20 N on the pedals. Calculate the power generated by the cyclist.

Accepted Answer

200 W

Answer

100 W

Answer

400 W

Answer

500 W

Question 16

Which of the given options is NOT a form of potential energy?

Accepted Answer

Kinetic energy

Answer

Gravitational potential energy

Answer

Elastic potential energy

Answer

Chemical potential energy

Question 17

A gymnast lands from a jump of 2 meters. Assuming the gymnast's mass to be 50 kg, what is the change in gravitational potential energy?

Accepted Answer

1960 J

Answer

980 J

Answer

2940 J

Answer

3920 J

Question 18

The SI unit of energy is defined as the:

Accepted Answer

Joule

Answer

Newton

Answer

Watt

Answer

Kilogram

Question 19

Work is done when a force is applied on an object and:

Accepted Answer

The object moves in the direction of the force

Answer

The object moves against the direction of the force

Answer

The object remains stationary

Answer

The force is perpendicular to the displacement of the object

Question 20

Which of the following is a non-mechanical form of energy?

Accepted Answer

Thermal energy

Answer

Kinetic energy

Answer

Gravitational potential energy

Answer

Elastic potential energy

Question 21

Power is defined as the rate of:

Accepted Answer

Work done

Answer

Energy stored

Answer

Force applied

Answer

Distance covered

Question 22

Which energy system is responsible for providing energy during activities lasting between 10 seconds and 2 minutes?

Accepted Answer

Glycolytic system

Answer

ATP-PC system

Answer

Oxidative system

Answer

Alactic system

Question 23

Which of the following exercises is a closed kinetic chain exercise?

Accepted Answer

Squat

Answer

Bicep curl

Answer

Leg extension

Answer

Bench press

Question 24

The patellar tendon's primary function is to:

Accepted Answer

Connect the quadriceps muscle to the tibia

Answer

Connect the hamstrings muscle to the femur

Answer

Stabilise the knee joint

Answer

Produce movement at the knee joint

Question 25

Which principle of training involves setting training workloads that gradually challenge the body?

Accepted Answer

Progression

Answer

Specificity

Answer

Reversibility

Answer

Individualisation

Question 26

Differentiate between potential and kinetic energy, providing clear examples from a sports context.

Accepted Answer

Potential energy is stored energy due to position or height, while kinetic energy is energy due to motion.

Answer

Kinetic energy is stored energy due to position or height, while potential energy is energy due to motion.

Answer

Potential energy is always higher than kinetic energy in sports.

Answer

Potential energy can be converted to kinetic energy, but not vice versa.

Question 27

Define work done, explaining the key components involved.

Accepted Answer

Force applied over a distance in the direction of the force

Answer

Force exerted on an object perpendicular to its displacement

Answer

Kinetic energy gained by an object moving at a constant velocity

Question 28

Explain the concept of power and provide the formula used to calculate it.

Accepted Answer

Power is the rate at which work is done. It is calculated as work done per unit time.

Answer

Power is the displacement of an object per unit time.

Answer

Power is the energy stored in an object.

Answer

Power is the force applied to an object.

Question 29

Which of the following is NOT considered a form of energy?

Accepted Answer

Momentum

Answer

Kinetic energy, energy of motion

Answer

Potential energy, energy due to position

Answer

Thermal energy, energy due to temperature

Question 30

State the principle of conservation of energy and explain its significance.

Accepted Answer

The total energy of an isolated system remains constant, meaning energy can neither be created nor destroyed, only transferred or transformed.

Answer

Energy can be created from nothing.

Answer

Energy is always lost in any process.

Question 31

What type of reaction releases energy in the form of heat?

Accepted Answer

Exothermic reaction

Answer

Neutral reaction, a reaction with no heat exchange

Answer

Endothermic reaction, a reaction that absorbs heat

Question 32

Define the efficiency of a machine and explain how it is calculated.

Accepted Answer

Efficiency is the ratio of useful output energy to input energy, expressed as a percentage.

Answer

Efficiency is the input energy divided by the output energy.

Answer

Efficiency is the difference between input energy and output energy.

Answer

Efficiency is the output energy multiplied by the input energy.

Question 33

Which of the following can reduce the efficiency of a machine?

Accepted Answer

Friction

Answer

Humidity, as water vapor can interfere with operation

Answer

Altitude, since air density affects efficiency

Answer

Temperature, as extreme temperatures can affect materials

Question 34

Which factor directly influences the amount of work done on an object?

Accepted Answer

The distance moved in the direction of the applied force

Answer

The time taken to move the object

Answer

The mass of the object

Question 35

A force of 20 Newtons (N) is applied to an object, causing it to move 4 meters (m) in the direction of the force. What is the work done on the object?

Accepted Answer

80 Joules (J)

Answer

120 J

Answer

160 J

Answer

40 J

Question 36

What is the standard unit of measurement for power in the International System of Units (SI)?

Accepted Answer

Watt (W)

Answer

Newton (N)

Answer

Joule (J)

Answer

Horsepower (hp)

Question 37

An engine performs 500 Joules (J) of work in 10 seconds. What is the power output of the engine?

Accepted Answer

50 Watts (W)

Answer

100 W

Answer

10 W

Question 38

Which of the following is a form of energy that an object possesses due to its motion?

Accepted Answer

Kinetic energy

Answer

Work

Answer

Force

Answer

Power

Question 39

How does the kinetic energy of an object change with its speed?

Accepted Answer

Kinetic energy increases proportionally to the square of the speed

Answer

Kinetic energy decreases as speed increases

Answer

Kinetic energy remains constant regardless of speed

Question 40

Which energy source is considered non-renewable because it is formed over millions of years and is finite?

Accepted Answer

Fossil fuels (like coal, oil, and natural gas)

Answer

Solar energy

Answer

Hydroelectric energy

Answer

Wind energy

Question 41

What is the primary energy source for Earth's climate system and the majority of life on Earth?

Accepted Answer

The Sun

Answer

The Moon

Answer

The Earth's core

Answer

Fossil fuels

Question 42

Which factor primarily contributes to the loss of energy in a machine, reducing its efficiency?

Accepted Answer

Friction

Answer

Altitude

Answer

Humidity

Answer

Temperature