TOPIC 1

Question 1

What are all of the energy stores

Answer 1

Thermal energy stored
Kinetic energy stores 
Gravitational potential 
Elastic potential 
Chemical energy 
Magnetic energy 
Electrostatic energy 
Nuclear

Question 2

How is energy transferred

Answer 2

Mechanically(by a force doing work) electrically (work done by moving charges), by heating or radiation (light and sound)

Question 3

What is a system

Answer 3

It’s a single object or a group of objects that your interested in

Question 4

What happens when a system changes

Answer 4

Energy is transferred. It can be. transferred away into or away from the system

Question 5

What is a closed system

Answer 5

Systems where neither matter nor energy can enter or leave

Question 6

What is the net change

Answer 6

The net change is the total energy of s closed system is always zero

Question 7

Give different ways energy can be transferred

Answer 7

When a system changes
When something is heated
Or by work done

Question 8

When can work be done

Answer 8

When a current flows or by a force moving an object

Question 9

How can we tell an object has kinetic energy

Answer 9

When the object moves

When an object speeds and is transferred away from this store when an object slows down

Question 10

What does the energy in the kinetic energy store depend

Answer 10

The objects mass and speed. The greater it’s mass and the faster it’s going, the more energy there will be in its kinetic energy store

Question 11

What is the formula for to find out kinetic energy

Answer 11

E= 1/2mv2

Question 12

What energy is transferred into the object when it is lifted

Answer 12

Gravitational potential. The higher the object is lifted, the more energy is transferred to this store

Question 13

What effects the amount of energy stored in an object

Answer 13

Mass ,it’s height and the strength of the gravitational field the object is in

Question 14

What is the equation to find out the change in energy in an objects g.p.e store for a change in height

Answer 14

E=mgh

Question 15

Does a falling object have air resistance

Answer 15

No

Question 16

What happens when an object falls give to two energy that is starts and what is transfers to

Answer 16

Energy form its gravitational potential energy store is transferred to oust kinetic energy store

Question 17

What energy acts against all falling objects

Answer 17

Air resistance it causes some energy to be transferred to other energy stores

Question 18

What can be done to an object that makes it turn into elastic potential energy store

Answer 18

Stretching or squashing

Question 19

Energy in the elastic potential energy store of a stretched spring can be found using

Answer 19

E =1/2 ke2

Question 20

What is specific heat capacity

Answer 20

Is the amount of energy need to raise the temperature of 1kg it a substance by 1c

Question 21

What is the equation linked to energy transferred to specific heat capacity

Answer 21

Change in thermal energy (j)E =mass(kg)specific heat capacity (j/kgC)change in thermal energy temperature change (.C)

Question 22

What is the conservation of energy principle is that energy is always conserved

Answer 22

Energy can be transferred usefully,stored or dissipated,but can never be create or destroyed

Question 23

Is it true that when energy is transferred that all the energy gets transferred

Answer 23

No, because not all the energy is transferred usefully into the store that you want it to go. Some energy is always dissipated when an energy transfer takes place

Question 24

What is dissipated energy called sometimes

Answer 24

Wasted energy

Because the energy is being stored in a way that is not useful

Question 25

What is power

Answer 25

The rate of energy transferred or the rate of doing work

Question 26

What is power measured in

Answer 26

Watts | One watt= 1 joule of energy transferred per second

Question 27

What Is an advantage and a disadvantage of a powerful machine

Answer 27

A powerful machine if not necessarily one which can exert force. A powerful machine is one which transfers a lot of energy in a short space of time

Question 28

Why are useful devices useful when transferring energy

Answer 28

They can transfer energy from one store to another

Question 29

How can you improve the efficiency of energy transfers

Answer 29

By insulting objects, lubricating them or making them more streamlined

Question 30

What is the equation of the efficiency for any energy transfer

Answer 30

Efficiency =useful output energy transfer \total input energy transfer

Question 31

Give the equation for efficiency when you know the power input and output

Answer 31

Efficiency = useful power output/total power input

Question 32

What generates electricity

Answer 32

Renewable and non-renewable

Question 33

What are non-renewable energy

Answer 33

Fossil fuels and nuclear fuel

Question 34

Where do fossil fuel form

Answer 34

Underground over millions of years

Question 35

What are the three main fossil fuel

Answer 35

Coal Oil Gas

Question 36

Give three disadvantage of fossil fuels

Answer 36

These will all “run out” one day They all do damage to the environment But they provide most of our energy

Question 37

Why she’s renewable energy better than non-renewable energy

Answer 37

Because renewable energy will never run out

Question 38

Renewable energy resources are

Answer 38

``` The sun ( solar) Wind Water waves Hydro-electricity Bio-fuel Tides Geothermal ```

Question 39

Why are renewable energy better

Answer 39

These will never run out-they energy can be renewed Most of them do damage the environment,but in less nasty ways the non-renewables The trouble is they don’t provide much energy and some of them are unreliable because they depend on the weather

Question 40

Where can energy resources be used

Answer 40

They can be used for transport | Transport is one of the most obvious places where fuel is used

Question 41

Non-renewable energy resources are used in

Answer 41

Petrol and diesel powered vehicles use created from oil Coal is used in sine old fashioned steam Trains to boil water to produce steam

Question 42

Renewable energy resources are used in

Answer 42

Vehicles that run on pure bio-fuels or a mix of a bio-fuel and petrol or diesel (only the boi fuel bit is renewable, though)

Question 43

What else is energy resources needed for

Answer 43

Heating things like your home

Question 44

How do wind turbines produce electricity

Answer 44

Turbines have a generator inside it- the rotating blades turn the generator and produce electricity

Question 45

Wind turbines are not a pretty site to look at. Explain why you need 1500 wind turbines

Answer 45

It’s for when a coal-fired power station is removed and 1500 of them cover a lot of ground-which have a big effect on the scenery

Question 46

How much energy do wind turbines produce

Answer 46

70-85%

Question 47

Why are wind turbines not trustworthy

Answer 47

There’s a problem of the turbines stopping when the wind stops or if the wind is too strong

Question 48

What are the initial costs for wind turbines

Answer 48

Costs are quite highly but there are no fuel costs and minimal runny costs

Question 49

Why happens when you remove turbines

Answer 49

No permanent damage to the landscape | If you remove the turbines you remove the noise and the view returns to normal

Question 50

How do solar cells generate electric current

Answer 50

Directly from the sun. Solar cells are often the best source of energy to charge batteries in calculators and watches which don’t use much electricity

Question 51

Where are solar power often used

Answer 51

To remote places where there’s not much choice and to power electric road signs and satellites

Question 52

Why are solar power more reliable in hotter countries

Answer 52

Very reliable source of energy- but only in the daytime. Solar power can still be cost/effective even in cloudy countries like Britain though

Question 53

How are solar cells used to generate electricity

Answer 53

On relatively small scale

Question 54

Where is geothermal power found

Answer 54

In volcanic area or where hot rocks lie quite near to the surface.

Question 55

What damages does geothermal power do to the environment

Answer 55

Brilliant free energy that reliable and does very little damage to the environment

Question 56

What is geothermal power use to generate

Answer 56

It generates electricity or to heat buildings directly

Question 57

What are the main drawbacks with geothermal power

Answer 57

There aren’t any suitable locations for power plants, and that the cost of building a power plant Is often highly compared to the amount of energy it produces

Question 58

What does hydro-electric power require

Answer 58

Usually require the flooding of valley by building a big dam

Question 59

What is the impact of the hydro-electricity on god environment

Answer 59

It cause flooding of the valley and possible loss of habitat for some species

Question 60

Why does hydro-electric effect humans

Answer 60

Putting hydroelectric power stations in remote valleys tends to reduce their impact on humans

Question 61

What is a big advantage of hydro-electricity

Answer 61

It can provide an immediate response to an increase demand for electricity