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Edexcel iGCSE (9-1) Physics > Energy > Flashcards

Flashcards in Energy Deck (23)
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1

What is chemical energy?

Energy stored in a substance due to the bonds between atoms

2

What is kinetic energy?

The energy stored in an object that is moving, depending on its mass and speed

3

What is gravitational potential energy?

The energy stored in an object due to its mass and position in a gravitational field. Depends on the object’s mass, the height above the Earth and the gravitational field strength

4

What is elastic potential energy?

The energy stored in an object when it is stretched or compressed

5

What is thermal energy?

The energy stored in an object because of its temperature

6

What is electrostatic energy?

The energy stored in a system of charged objects

7

What is magnetic energy?

The energy stored in a system of magnetic objects

8

What is nuclear energy?

The energy stored in the nuclei of atoms, due to the bonds between protons and neutrons

9

List all eight stores of energy

Chemical
Kinetic
Gravitational potential
Elastic potential
Thermal
Electrostatic
Magnetic
Nuclear

10

List all four energy transfers

Mechanically (by forces)
Electrically (current moving through a potential difference)
By heating
By radiating light
By radiating sound

11

What is the principle of the conservation of energy?

Energy can neither be created nor destroyed, only transferred between one store and another or dissipated into the surroundings

12

What does the conservation of energy mean about the total energy of a closed system?

The total energy of a closed system has no net change

13

Define conduction

The transfer of thermal energy due to vibrating particles colliding with neighbouring particles and transferring kinetic energy between them

14

Define convection

The transfer of thermal energy due to particles with high kinetic energy moving from hot to cold areas

15

Define radiation

The transfer of thermal energy by the emittance of electromagnetic infrared radiation

16

The greater the difference in the temperature of two objects...

The faster the transfer of thermal energy from one to the other

17

True or false: all objects are continually emitting IR radiation?

True

18

If all objects are continually emitting and absorbing infrared radiation, how do hot objects cool down?

They emit more infrared radiation than they absorb

19

List 5 methods to prevent heat loss from a house

Double glazing
Cavity wall insulation
Aluminium foil behind radiators
Draft excluders
Curtains

20

True or false: some energy transfers can be 100% efficient

False: no energy transfer is ever 100% efficient as some energy is always lost to the surroundings, often by heating due to friction

21

What equipment do we use in the conduction experiment?

A metal rod at least 30 cm long
Marbles
Wax
Clamp stand
Stopwatch
Bunsen burner

22

What equipment do we use in the convection experiment?

Beaker
Water
Potassium permanganate crystals
Bunsen burner

23

What equipment do we use in the radiation experiment?

Leslie cube
Boiling water
Heatproof mat
Infrared detector