TERM 2 - Energy

Question 1

What’s amplitude?

Answer 1

The distance between the wave peak and the point of equilibrium. (fancy term for the line that’s halfway through the waves)

Question 2

What is energy?

Answer 2

Energy is the capacity to do work.

Question 3

What is potential energy?

Answer 3

Energy which is stored - that hasn’t been used.

Question 4

What is kinetic energy?

Answer 4

Energy is use.

Question 5

Joules (J) are…

Answer 5

a measurement of energy.

Question 6

What is the formula for GPE?

Answer 6

GPE = (Mass) x (Gravitational Force) x (Height)

Question 7

What does the law of conservation of energy state?

Answer 7

That energy cannot be created or destroyed - that the amount of energy available is set in stone.

You don’t need to remember this but:
Fun fact - the Law of Conservation of energy either means that there’s a set amount of energy in the universe OR there’s an infinite amount of energy in the universe.

Question 8

What type of energy always happens as a by-product of an energy transfer?

Answer 8

Heat energy

Question 9

What is the difference between useful and wasted energy?

Answer 9

Wasted energy is energy which escapes an energy transformation where it is no longer energy useful for the energy transformation.

Question 10

What is energy efficiency?

Answer 10

Either of these are fine:

A) A measure of the amount of energy kept in an energy transformation.
B) A process where little energy is lost.

Question 11

What is the formula for energy efficiency?

Answer 11

Energy Efficiency = (useful energy) / (input energy)

Question 12

What does heat energy do when there’s an object in its vicinity with a lower temperature?

Answer 12

It transfers to that object.

Question 13

What are the three methods of heat transfer?

Answer 13

Conduction, convection and radiation.

Question 14

What is conduction?

Answer 14

Where heat flows from a hotter substance to a colder substance.

Question 15

What is convection?

Answer 15

A process where a colder fluid sinks below a warmer fluid, resulting in heat transfer.

Question 16

What is radiation?

Answer 16

A energy transfer method where an object absorbs heat energy in the form of light.

Question 17

What does incandescent describe?

Answer 17

An object that emits light as a result of heat.

Question 18

What does bioluminescent mean?

Answer 18

An organism which naturally produces light of its own.

Question 19

What does frequency mean?

Answer 19

The amount of waves in a set distance. (waves with longer wavelength have less frequency)

Question 20

What does wavelength mean?

Answer 20

The distance between two amplitudes which are beside each other.

Question 21

What does pitch mean?

Answer 21

Describes the frequency, so a high pitch is a high frequency.

Question 22

What do the terms compressions and rarefactions mean?

Answer 22

They refer to parts of a substance sound waves are travelling through. Denser parts are called compressions and less dense parts are called rarefactions.

Question 23

What are the five forms of potential energy?

Answer 23

Chemical, Elastic, Gravitational, Electrical and Nuclear.

Question 24

What are the three subcategories of kinetic energy?

Answer 24

Vibrational, Rotational and Translational

Question 25

What are four things houses can do to become more energy efficient?

Answer 25

1. Turning electrical devices off when not needed.
2. Insulating walls to keep heat.
3. Using blinds to stop escaped heat.
4. Closing open seals.

Question 26

What are longitudinal waves?

Answer 26

Waves which do loops around the equilibrium line.

Question 27

What are transverse waves?

Answer 27

Normal waves.