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Physics 3rd form > Energy > Flashcards

Energy Flashcards

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1
Q

What is a system

A

An object or a group of objects

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2
Q

When the system changes what happens to the energy

A

There are changes in the way it is stored

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3
Q

What is energy

A

The ability to do work

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4
Q

What do we need to do work

A

Energy

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5
Q

What is work

A

When there is a force and when that force is on something that is moving
E.g Liszt a chair

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6
Q

What are the energy stores

A 
Chemical energy 
Gravitational potential energy 
Elastic potential energy 
Thermal energy 
Kinetic energy 
Magnetic store 
Electrostatic store 
Nucleus store
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7
Q

How is chemical energy stored

A

In food or batteries as well as coal oil and gas

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8
Q

How is GPE stored

A

This is stored in the night of the object

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9
Q

How is elastic potential energy stored

A

If you compress or stretch elastic material you get elastic energy

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10
Q

How is thermal energy stored

A

If you heat something up it stores energy

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11
Q

How is kinetic energy stored

A

This energy is stored in things that are moving

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12
Q

What is magnetic store

A

When a magnetic object repels or attracts

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13
Q

What is electrostatic store

A

When you take two charges and rub them together

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14
Q

What is the nucleus store

A

The nucleu is a store of energy

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15
Q

Why can 100% efficiency not happen in the real world

A

Because there if friction which turns into thermal energy and is wasted

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16
Q

How do you calculate the efficiency of something

A

Total in. Useful out. Wasted
GPE. Kinetic. Thermal
100j. 80j. 20j

Efficiency = useful energy out
Total energy in
Efficiency = 80%

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17
Q

What must happen in order for you to do work

A

Energy must be transferred

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18
Q

What is the law of conservation

A

Energy can not be created
Energy can not be destroyed
Energy only transfers between stores

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19
Q

How do you calculate work

A

Work = force applied * distance

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20
Q

What are some factors affecting GPE

A

height lifted
The mass
Gravitational field strength

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21
Q

What is equilibrium

A

When forces are balanced

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22
Q

How do you work out GPE

A

GPE = massgravityhight

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23
Q

What is mass measured in

A

Kg

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24
Q

What is gravity measured in

A

Nuetons N

25
Q

What is energy measured in

A

Jewels J

26
Q

What is height measured in

A

Metres M

27
Q

How do you rearrange the GPE eqauation

A

H = E
MG
M = E
GH

28
Q

What are factors affecting kinetic energy

A

Speed an mass

29
Q

What is velocity

A

Speed

30
Q

How do you work out kinetic energy

A

Energy = half * Mass * velocity sqaured

31
Q

What is velocity measured in

A

M/s

32
Q

How do you rearrange the kinetic energy formula

A

M = E * 2
V * V

V = square root of 2 * E / M

33
Q

What is power

A

The rate of which energy is transferred per unit time or the rate of which work is done per unit time

34
Q

What is direct proportion

A

Whatever you do to one you have to do to the other

35
Q

What does directly proportional look like on a graph

A

Must be a straight line and it must go through the origin

36
Q

How many watts are in 1j

A

1

37
Q

What is high power

A

When you transfer energy quickly

38
Q

What is low power

A

When you transfer energy slowly

39
Q

What is the power equation

A

Power = Energy

Time

40
Q

Rearrange the power equation

A

E=PT
T=E
P

41
Q

What is power measured in

A

Watts W

42
Q

What are the main energy resources available to use on earth

A 
Fossil fuels 
Nuclear fuel 
Bio fuel 
Wind 
Hydroelectricity 
Geothermal 
The tides 
Sun and water waves
43
Q

What does renewable mean

A

Something that is being or can be replenished as it is used

44
Q

What are the uses of these energy recourses

A

Transport
Electricity generation
Heating

45
Q

What energy resources are renewable

A

Solar power- the sun will always shine
Wind power- wind is constant
Tidal power- always be water
Hydroelectric power- always water
Pumped storage- the water goes back to the top of reservoir
Wave power- water always there
Geothermal- the core is heat so keeps on producing steam

46
Q

What energy resources aren’t renewable

A

Nuclear power- limited uranium

Fossil fuels- limited amount

47
Q

What energy resources are reliable

A 
Fossil fuels- burn when needed 
Nuclear power- use it whenever needed
Tidal power- we can predict tides 
Hydroelectric power- you can store it in high demand use it 
Pumped storage- use it whenever needed
Wave power- the sea is always there
 Geothermal- dig whenever wanted
48
Q

What energy resources are not reliable

A

Wind power- not always windy

Solar power- not always sunny

49
Q

What is the environmental impact of fussil fuels

A

The biggest problem of fossil fuels is pollution burning them produces CO2 which contributes to the greenhouse effect

50
Q

What are the environmental impacts on nuclear power

A

It is very very dangerous if something goes wrong. Example Chernobyl must be sealed up

51
Q

What are the environmental impacts on solar power

A

There are none

52
Q

What are the environmental impacts on wind power

A

The turbine can kill birds when is spinning fast reduces no waste or greenhouse gases you can still use the land beneath a farm

53
Q

What are the environmental impacts of tidal power

A

No greenhouse gases fish can’t migrate

54
Q

What are the environmental impacts on hydroelectric power

A

No waste of pollution building a dam will cause flooding upstream causing disruption to animals

55
Q

What is the environmental impacts of pumped storage

A

Little effect on landscape no pollution or waste

56
Q

What are the environmental impacts on wave power

A

No fuel needed

57
Q

What are the environmental impacts on geothermal power

A

Destroys land
Soil destroyed
Noise and sight pollution

58
Q

How do can you create electricity using a magnet and coils of wire

A

Are you wiggle them together

Physics 3rd form (2 decks)

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