Energy and Motion in Biomechanics for Sport: Master the Concepts

Question 1

What is the relationship between work and power?

Accepted Answer

Power is the rate at which work is done.

Answer

Work is a scalar quantity, while power is a vector quantity.

Answer

Work is measured in watts, while power is measured in joules.

Question 2

Which of the following is the SI unit of work?

Accepted Answer

Joule

Answer

Newton

Answer

Watt

Answer

Erg

Question 3

What is the formula for calculating work done?

Accepted Answer

Force × Distance

Answer

Power × Time

Answer

Energy × Time

Answer

Force / Distance

Question 4

What type of work is done when a force is applied in the same direction as the displacement?

Accepted Answer

Positive work

Answer

Negative work

Answer

Zero work

Answer

Gravitational work

Question 5

What is the difference between power and energy?

Accepted Answer

Power is the rate at which energy is transferred or transformed, while energy is the total capacity of a system to do work.

Answer

Energy is the rate at which power is transferred or transformed, while power is the total capacity of a system to do work.

Answer

Power and energy are the same concept.

Answer

Power is a vector quantity, while energy is a scalar quantity.

Question 6

What is the formula for calculating the potential energy of an object at a given height?

Accepted Answer

PE = mgh

Answer

PE = mgv

Answer

PE = mvt

Answer

PE = mgh/2

Question 7

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

Accepted Answer

Elastic potential energy

Answer

Energy of a moving object

Answer

Energy of a rotating object

Answer

Energy of a vibrating object

Question 8

What is the principle of conservation of energy?

Accepted Answer

Energy cannot be created or destroyed, but only transferred or transformed.

Answer

Energy is always constant in a closed system.

Answer

Energy can be lost or gained without any external influence.

Answer

Energy is proportional to the mass of an object.

Question 9

How does friction affect the efficiency of a mechanical system?

Accepted Answer

Friction reduces efficiency by converting mechanical energy into heat.

Answer

Friction increases efficiency by providing a stabilizing force.

Answer

Friction has no effect on efficiency.

Answer

Friction only affects efficiency in systems with high speeds.

Question 10

What is the SI unit of energy?

Accepted Answer

Joule

Answer

Newton

Answer

Watt

Answer

Volt

Question 11

For work to be done, a force must be applied to an object and the object must:

Accepted Answer

Move in the direction of the force

Answer

Accelerate in the direction of the force

Answer

Be perpendicular to the direction of the force

Answer

Remain stationary

Question 12

Which of the following factors does NOT influence the power output of a movement?

Accepted Answer

Mass of the object

Answer

Force applied

Answer

Displacement

Answer

Time taken

Question 13

The energy stored within an object due to its vertical position above a reference point is called:

Accepted Answer

Potential energy

Answer

Kinetic energy

Answer

Chemical energy

Answer

Thermal energy

Question 14

Which type of energy is associated with movement?

Accepted Answer

Kinetic energy

Answer

Potential energy

Answer

Chemical energy

Answer

Thermal energy

Question 15

According to the principle of conservation of energy:

Accepted Answer

Energy can be changed from one form to another

Answer

Energy can be created or destroyed

Answer

Energy is lost in all processes

Answer

Energy is constant and cannot be altered

Question 16

What is the SI unit of power?

Accepted Answer

Watt

Answer

Newton

Answer

Joule

Answer

Volt

Question 17

To increase power output, an athlete should:

Accepted Answer

Increase force and/or decrease time

Answer

Decrease displacement and/or decrease time

Answer

Increase displacement and/or increase time

Answer

Decrease force and/or increase time

Question 18

Which energy system is primarily utilized during high-intensity activities lasting under 10 seconds?

Accepted Answer

ATP-PC System

Answer

Glycolytic System

Answer

Oxidative System

Answer

Lactic Acid System

Question 19

Which of the following is the SI unit of work performed?

Accepted Answer

Joule (J)

Answer

Kilogram (kg)

Answer

Watt (W)

Answer

Newton (N)

Question 20

Which of the following is the SI unit of power?

Accepted Answer

Watt (W)

Answer

Joule (J)

Answer

Newton (N)

Question 21

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

Accepted Answer

Thermal energy

Answer

Kinetic energy

Answer

Potential energy

Question 22

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

Accepted Answer

Frictional energy

Answer

Elastic energy

Answer

Kinetic energy

Answer

Gravitational energy

Question 23

Which of the following factors can affect the efficiency of a simple machine?

Accepted Answer

Friction

Answer

Mass of the machine

Answer

Height of the machine

Answer

Color of the machine