Energy

Question 1

What is the equation of Gravitational Potential Energy?

Answer 1

Mass x gravitational field strength x height

Question 2

What is the equation of kinetic energy?

Answer 2

1/2 x mass x velocity2

Question 3

Explain what is meant by the conservation of energy

Answer 3

Total energy before is equal to total energy after a transfer. Energy cannot be created or destroyed.

Question 4

What is the energy transfer when an object is thrown vertically upwards

Answer 4

Kinetic to Gravitational

Question 5

What is the energy transfer when a moving object collides with an obstacle coming to a stop?

Answer 5

Kinetic into Heat and Sound

Question 6

What is the energy transfer when a falling mass accelerates the trolley?

Answer 6

Gravitational and Kinetic (and heat and sound)

Question 7

What is the energy transfer when boiling a kettle?

Answer 7

Electrical into Heat (and sound)

Question 8

What is the main form of wasted energy?

Answer 8

Heating of the surroundings

Question 9

Explain ways of reducing unwanted energy

Answer 9

Lubrication and insulation

Question 10

Describe the effects of the thickness and thermal conductivity of the walls of a building on its rate of cooling.

Answer 10

The thicker the wall and the better the insulation the less the building will cool.

Question 11

What is meant by a renewable energy resource?

Answer 11

Will not run out

Question 12

What is meant by a non-renewable energy resource?

Answer 12

Will run out

Question 13

Explain the 5 main stages of a fossil fuel power station

Answer 13

1) Burn the fuel to produce heat
2) Boil water to produce steam
3) The steam then turns the turbines
4) Turbines then turns the generators
5) generators then produce electricity

Question 14

What is the name of the process that produces heat in a nuclear power station?

Answer 14

Nuclear Fission

Question 15

What is the main environmental effect of using fossil fuels?

Answer 15

CO2 leads to climate change

Question 16

What is the main environmental effect of Nuclear Power?

Answer 16

Nuclear waste is extremely hazardous and must be stored very carefully

Question 17

What is the main disadvantage of wind, solar and wave energy resources

Answer 17

Un reliable- will only produce energy when the weather allows it

Question 18

Which renewable energy resources can respond to demand?

Answer 18

Geo-thermal
Hydro electric
Tidal

Question 19

What are the 8 different types of energy

Answer 19

Kinetic
Thermal
Chemical
Gravitational Potential
Elastic Potential
Electrostatic
Magnetic
Nuclear

Question 20

What are the 4 ways in which energy can be transferred between stores?

Answer 20

Mechanically
Electrically
By heating
By radiation

Question 21

What is efficiency?

Answer 21

Energy is only useful when it is transferred from one store to a useful store

Question 22

How can you calculate efficiency?

Answer 22

Useful energy/ total energy

Question 23

What is lubrication?

Answer 23

It reduces energy transferred by friction

Question 24

What is insulation?

Answer 24

Insulation reduces the rate of energy transfer by heating

Question 25

What are the renewable energy resources?

Answer 25

Biomass
Wind
Solar
Hydro-electric
Tidal

Question 26

What are the non-renewable energy resources?

Answer 26

Fossil fuels

Nuclear

Question 27

What are the units for energy?

Answer 27

Joules J

Question 28

What links kinetic energy, braking force and braking distance?

Answer 28

Kinetic energy = braking force x braking distance