Chapter 5 Energy

Question 1

Elastic potential energy

Answer 1

Energy stored within a stretched or compressed object, like a spring or elastic material

Question 2

Electrical energy

Answer 2

Energy that causes charged particles to move

Question 3

Energy

Answer 3

The ability to make a change happen; different forms include heat light and energy and sound

Question 4

Gravitational potentional energy

Answer 4

stored energy of an object that is held above the earths surface

Question 5

Heat energy

Answer 5

A measure of the total kinetic energy possessed by particles in a substance.

Question 6

Joule (J)

Answer 6

Unit of measurement for energy.

Question 7

Kinetic energy

Answer 7

energy possessed by a moving object.

Question 8

Light energy

Answer 8

Form of energy that is visible, such as that produced by the sun.

Question 9

Nuclear energy

Answer 9

Energy stored inside an atom

Question 10

Photosynthesis

Answer 10

The process I which plants take light energy and convert in to chemical potential energy.

Question 11

Potential energy

Answer 11

Stored energy possessed by an object, such as elastic potential energy of a squashed spring.

Question 12

Sound energy

Answer 12

Energy that travels as vibrating waves and can be heard by our ears as sound

Question 13

Work

Answer 13

This is done whenever an object is moved or is forced to change shape.

Question 14

Energy efficiency

Answer 14

The proportion of useful energy output from a device compared to the amount of energy that is input. This is usually expressed as a percentage.

Question 15

Energy flow diagram

Answer 15

Diagram using arrows that shows the way energy is passed on or changed into other forms in a particular situation.

Question 16

Energy transfer

Answer 16

The flow of energy from one object into another object, for example, the flow of heat from a metal spoon to your hand, or the kinetic energy from a bat to a ball.

Question 17

Energy transformation

Answer 17

The conversion of one type of energy; for example the conversion of electrical energy from a MP3 player into sound light and heat energy.

Question 18

Law of conservation of energy

Answer 18

Energy cannot be created or destroyed, it can only be transferred from one object to another or transformed into another form of energy.

Question 19

Energy rating label

Answer 19

A label showing a number of stars (usually from 1-6) which can be used to compare the efficiency of different appliances.

Question 20

Insulation

Answer 20

material added into ceilings and between walls of a house to reduce heat transfer.

Question 21

Chemical energy

Answer 21

Energy stored within a substance such as fuel or food, that may be released when the substance is burnt or digested.

Question 22

National house energy rating scheme

Answer 22

A scheme that uses computer simulations to provide a star rating (to a maximum of 10 stars) to houses based on the effectiveness of the external walls against heat loss.

Question 23

Organic photovoltaics

Answer 23

A new generation of flexible and cheap solar cells made from carbon-based materials.

Question 24

Regenerative brakes

Answer 24

Vehicle braking system that stores some of the kinetic energy of a car as it slows down and uses this energy to power the car.