Year 8 Energy Revision

Question 1

What is Energy?

Answer 1

“Ability to do work”

Question 2

What are the two types of energy?

Answer 2

Potential and Kinetic

Question 3

What is Potential Energy?

Answer 3

The energy that is stored within an object and has the potential to make something happen

Question 4

What Is Kinetic Energy?

Answer 4

The energy an object possesses whilst it’s moving.

Question 5

What are the types of Potential Energy?

Answer 5

Chemical, Nuclear, Elastic and Gravitational

Question 6

What are the types of Kinetic Energy?

Answer 6

Mechanical, Electrical, Thermal, Sound and Radiant

Question 7

What is Chemical energy?

Answer 7

Stored in atoms + Molecules

Question 8

What is Nuclear Energy?

Answer 8

Stored in atoms Nuclei

Question 9

What is Elastic Energy?

Answer 9

Stored in elastic objects

Question 10

What is Gravitational Energy?

Answer 10

Stored in an object’s height

Question 11

What is Mechanical Energy?

Answer 11

Due to the motion of an object

Question 12

What is Electrical Energy?

Answer 12

Flow of electric charge

Question 13

What is Thermal Energy?

Answer 13

Vibration/Movement of particles

Question 14

What is Sound Energy?

Answer 14

Vibration transferred through an object by waves

Question 15

What is Radiant Energy?

Answer 15

Travels in waves

Question 16

What is the Law of Conservation of Energy?

Answer 16

Energy cannot be created or destroyed. It can only be changed from one form to another.

Question 17

What energy travels in waves?

Answer 17

Sound energy

Question 18

What are the two main types of sound waves?

Answer 18

Transverse and Longitudinal waves.

Question 19

What is a transverse wave and how does it travel?

Answer 19

Transverse waves have a crest and trough. They move at a right angle (perpendicular).

Question 20

What is a Longitudinal wave and how does it travel?

Answer 20

Longitudinal waves have a compression and rarefaction. They move backwards and forwards (parallel).

Question 21

What is the amplitude?

Answer 21

It is the maximum distance that each particle moves away from the resting position.

Question 22

What is the wavelength?

Answer 22

It is the distance between 2 crests or 2 troughs.

Question 23

Which wave provides more energy? Short wavelength or long wavelength

Answer 23

Short wavelength makes more energy.

Question 24

What is the frequency?

Answer 24

Number of complete waves made in 1 second and is measured in Hertz = 1Hz = 1 wave.

Question 25

Which wave provides more energy? high frequency or low frequency?

Answer 25

High frequency makes more energy.

Question 26

What is the Electromagnetic Spectrum?

Answer 26

It is the continuum of all electromagnetic radiation

Question 27

What does the left side contain?

Answer 27

The left side contains big waves of energy that occurs less frequently.

Question 28

What does the right side contain?

Answer 28

The right side contains smaller waves that occur more frequently.

Question 29

What are the types of radiation?

Answer 29

Radio, microwaves, infrared, visible light, ultraviolet, x-rays and gamma rays.

Question 30

What is radio radiation?

Answer 30

Radio captures radio waves emitted by radio stations, stars and gases in space.

Question 31

What are microwaves?

Answer 31

Microwave radiation can be used to cook food. It is also used by astronomers to learn about the structure of galaxies.

Question 32

What is Infrared Radiation?

Answer 32

It cannot be seen by the human eye and is emitted by all objects (sensed as heat).

Question 33

What is visible light?

Answer 33

The only wave of energy that can be seen by the human eye. it is necessary for the sense of sight.

Question 34

What is ultraviolet radiation?

Answer 34

Emitted by the sun (skin tan and burns).

Question 35

What is X-ray radiation?

Answer 35

Doctors use x-rays to look at your bones. Airport security uses them to see into your luggage.

Question 36

What is gamma-ray radiation?

Answer 36

See inside your body (PET Scan).

Question 37

What is Far Infrared Radiation?

Answer 37

Thermal (heat). As heat increases, so does the amount of infrared radiation eg. Sunlight

Question 38

What are the two types of Infrared Radiation?

Answer 38

Far Infrared and Near Infrared.

Question 39

How can we see visible light?

Answer 39

Cones in our eyes. The colour of an object is the colour that is being reflected. All other colours are absorbed.

Question 40

What is Ultra-Violet Radiation?

Answer 40

Shorter wavelength than visible light. Not visible to the human eye and needed by humans (Provide vitamin D)

Question 41

What is light energy?

Answer 41

Any object that gives off its own light is luminous.

Question 42

What is Incandescent?

Answer 42

Light is emitted with the object becoming hot. e.g. Sun, Light Bulb

Question 43

What is Bioluminescent?

Answer 43

Light is emitted without the object becoming hot e.g. jellyfish, firefly’s (Often nature).

Question 44

What is Non-Luminous?

Answer 44

An object which reflects light from luminous sources, rather than generating their own light e.g. moon