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Physics 3rd form > Energy > Flashcards

Energy Flashcards

(58 cards)

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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

25
What is energy measured in
Jewels J
26
What is height measured in
Metres M
27
How do you rearrange the GPE eqauation
H = E MG M = E GH
28
What are factors affecting kinetic energy
Speed an mass
29
What is velocity
Speed
30
How do you work out kinetic energy
Energy = half * Mass * velocity sqaured
31
What is velocity measured in
M/s
32
How do you rearrange the kinetic energy formula
M = E * 2 V * V V = square root of 2 * E / M
33
What is power
The rate of which energy is transferred per unit time or the rate of which work is done per unit time
34
What is direct proportion
Whatever you do to one you have to do to the other
35
What does directly proportional look like on a graph
Must be a straight line and it must go through the origin
36
How many watts are in 1j
1
37
What is high power
When you transfer energy quickly
38
What is low power
When you transfer energy slowly
39
What is the power equation
Power = Energy | Time
40
Rearrange the power equation
E=PT T=E P
41
What is power measured in
Watts W
42
What are the main energy resources available to use on earth
``` Fossil fuels Nuclear fuel Bio fuel Wind Hydroelectricity Geothermal The tides Sun and water waves ```
43
What does renewable mean
Something that is being or can be replenished as it is used
44
What are the uses of these energy recourses
Transport Electricity generation Heating
45
What energy resources are renewable
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
What energy resources aren’t renewable
Nuclear power- limited uranium | Fossil fuels- limited amount
47
What energy resources are reliable
``` 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
What energy resources are not reliable
Wind power- not always windy | Solar power- not always sunny
49
What is the environmental impact of fussil fuels
The biggest problem of fossil fuels is pollution burning them produces CO2 which contributes to the greenhouse effect
50
What are the environmental impacts on nuclear power
It is very very dangerous if something goes wrong. Example Chernobyl must be sealed up
51
What are the environmental impacts on solar power
There are none
52
What are the environmental impacts on wind power
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
What are the environmental impacts of tidal power
No greenhouse gases fish can’t migrate
54
What are the environmental impacts on hydroelectric power
No waste of pollution building a dam will cause flooding upstream causing disruption to animals
55
What is the environmental impacts of pumped storage
Little effect on landscape no pollution or waste
56
What are the environmental impacts on wave power
No fuel needed
57
What are the environmental impacts on geothermal power
Destroys land Soil destroyed Noise and sight pollution
58
How do can you create electricity using a magnet and coils of wire
Are you wiggle them together

Physics 3rd form (2 decks)

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