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

Question 1

What is the formula for calculating work done?

Accepted Answer

Work = Force × Distance

Answer

Work = Force × Time

Answer

Work = Power × Time

Answer

Work = Energy × Efficiency

Question 2

Which of the following factors affects power output?

Accepted Answer

Both force applied and distance moved

Answer

Force applied

Answer

Distance moved

Answer

Time taken

Question 3

What is the efficiency of a machine that does 500J of work and uses 1000J of energy?

Accepted Answer

25%

Answer

50%

Answer

75%

Answer

100%

Question 4

What is the work done by a force that moves an object in a direction perpendicular to the force?

Accepted Answer

Zero work

Answer

Positive work

Answer

Negative work

Answer

Cannot be determined

Question 5

Which is the SI unit of work, defined as the force applied multiplied by the displacement over which it acts?

Accepted Answer

Joule

Answer

Newton

Answer

Watt

Answer

Kilogram

Question 6

Which of the following is NOT a form of potential energy, energy stored within a system due to its position or condition?

Accepted Answer

Kinetic energy

Answer

Gravitational potential energy

Answer

Elastic potential energy

Answer

Chemical potential energy

Question 7

The energy stored in a stretched elastic band is an example of:

Accepted Answer

Elastic potential energy

Answer

Gravitational potential energy

Answer

Chemical potential energy

Answer

Kinetic energy

Question 8

In the imperial system, what is the unit of power?

Accepted Answer

Horsepower

Answer

Watt

Answer

Joule

Answer

Newton

Question 9

The law of conservation of energy states that:

Accepted Answer

Total energy can be transferred or transformed from one form to another.

Answer

Total energy can be created or destroyed.

Answer

Total energy can be used up but not lost or gained.

Answer

Total energy is always constant.

Question 10

Which energy system is predominantly utilized during short-duration, high-intensity exercise, such as sprinting?

Accepted Answer

Adenosine triphosphate-phosphocreatine (ATP-PC) system

Answer

Lactic acid system

Answer

Glycolytic system

Answer

Oxidative system

Question 11

What is the formula for calculating the efficiency of a machine?

Accepted Answer

Efficiency = (Output Work / Input Work) x 100%

Answer

Efficiency = (Input Work / Output Work) x 100%

Answer

Efficiency = (Power Output / Power Input) x 100%

Answer

Efficiency = (Time Taken / Work Done) x 100%

Question 12

The formula for calculating the potential energy of an object is:

Accepted Answer

PE = mgh

Answer

PE = Fd

Answer

PE = 1/2mv²

Answer

PE = Pt

Question 13

Work represents the transfer of energy over time, while power refers to the rate at which work is performed. Which option accurately describes this relationship?

Accepted Answer

Work is the transfer of energy over time, while power is the rate at which work is done.

Answer

Energy is the ability to perform work, while power is the force applied over time.

Answer

Work is the force applied to an object over a distance, while energy is the rate at which work is done.

Answer

Energy is the ability to perform work, while work is the transfer of energy over time.

Question 14

An athlete weighing 100 kg lifts a barbell 2 meters with a time of 2 seconds. Calculate the athlete's power output.

Accepted Answer

200 W

Answer

50 W

Answer

100 W

Answer

400 W

Question 15

Describe the distinction between positive and negative work.

Accepted Answer

Positive work involves moving an object in the direction of the force applied, while negative work involves moving it in the opposite direction.

Answer

Positive work involves increasing an object's velocity, while negative work involves decreasing its velocity.

Answer

Positive work involves moving an object away from the force applied, while negative work involves moving it towards the force applied.

Answer

There is no distinction between positive and negative work.

Question 16

Which of the following activities is characterized by the greatest power requirement?

Accepted Answer

Sprinting

Answer

Cycling

Answer

Swimming

Answer

Walking

Question 17

In what way does the efficiency of a movement impact energy expenditure?

Accepted Answer

A more efficient movement necessitates less energy.

Answer

A more efficient movement requires more energy.

Answer

The efficiency of a movement has no bearing on energy expenditure.

Answer

Only highly skilled athletes are capable of efficient movements.

Question 18

Which of the following is the SI unit of energy?

Accepted Answer

Joule

Answer

Watt

Answer

Newton

Question 19

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

Accepted Answer

Heat

Answer

Kinetic energy

Answer

Elastic energy

Answer

Potential energy

Question 20

The work-energy theorem states that the net work done on an object is equivalent to its:

Accepted Answer

Change in kinetic energy

Answer

Total energy

Answer

Change in potential energy

Answer

Momentum

Question 21

Which of the following is a unit of power?

Accepted Answer

Watt

Answer

Joule

Answer

Newton-meter

Answer

Kilogram

Question 22

The efficiency of a machine is defined as the ratio of:

Accepted Answer

Useful output work to total input work

Answer

Total input work to useful output work

Answer

Kinetic energy to potential energy