Energy (P1)

Question 1

Name the ten energy forms

Answer 1

Magnetic
Kinetic
Heat
Light
Gravitational potential
Chemical
Sound
Electrical
Elastic potential
Nuclear

Question 2

What does conservation of energy mean?

Answer 2

No energy is ever created or destroyed.

It can be released if it is an open system but not if it’s closed

Question 3

What is work done

Answer 3

Energy transferred=work done

Work done (J)= Force (N) x Distance(m) 
Energy transferred= power x time

Question 4

Weight equation

Answer 4

Weight (N) = Mass x gravitational field strength

Question 5

Efficiency

Answer 5

Useful energy transferred by device
———————————————- x 100
Total energy transferred by device

Question 6

Gravitational potential energy equation

Answer 6

GPE= mass x gravitational field strength x height

J=kg x N/kg x m

Question 7

Kinetic energy equation

Answer 7

Kinetic energy = half x mass x velocity squared

J= kg x m/s

Question 8

What is power?

Answer 8

How quickly energy is transferred from one form to another

Power (W) = energy transferred (J) / time (s)

Question 9

Hooke’s law

Answer 9

Force applied to a spring= spring constant X extension

Question 10

Equation for change in thermal energy

Answer 10

Mass x SHC x temperature change

Question 11

Elastic potential equation

Answer 11

0.5 x spring constant x acceleration2

Question 12

Power equation

Answer 12

Power = work done/time

Question 13

What are the 4 energy pathways?

Answer 13

Thermal
Mechanical
Radiation
Electrical

Question 14

Internal energy

Answer 14

The total kinetic and potential energy of particles in an object

Question 15

Potential energy

Answer 15

Energy that is stored with the potential to do work

Question 16

8 energy stores

Answer 16

Thermal
Kinetic
Gravitational potential
Elastic potential
Chemical 
Magnetic
Electrostatic
Nuclear

Question 17

How can energy be transferred

Answer 17

Heating or doing work

Question 18

Energy transfers when falling

Answer 18

GPE to kinetic

Question 19

SHC

Answer 19

The energy required to increase the temperature of 1kg of a substance by 1 degree

Question 20

Change in thermal energy

Answer 20

Mass x SHC x temperature change

Question 21

Conduction

Answer 21

Where vibrating particles transfer energy to neighbouring particles

Question 22

Convection

Answer 22

Where energetic particles move away from hotter to cooler regions

Question 23

Radiators

Answer 23

Conduction transfers energy from the radiator to nearby air particles
Air becomes warmer and less dense
Warm air rises and is replaced by cooler air
The cycle repeats as it rises, then cools and falls to be heated again

Question 24

Lubrication

Answer 24

Reduces frictional force by reducing the friction between surfaces when they move

Question 25

Cavity wall insulation

Answer 25

Made up of an inner or outer wall with an air gap in the middle, reduces the energy transferred by conduction
Cavity wall insulation has foam to reduce convection

Question 26

Loft insulation

Answer 26

Reduces convection currents produced in lofts

Question 27

Double-glazed windows

Answer 27

Double-glazed windows have an air gap between windows to reduce conduction through the windows

Question 28

Drought excluders

Answer 28

Reduce energy transfers by convection

Question 29

Payback time equation

Answer 29

Cost of installation / energy saving costs