Topic 3- Conservation of Energy Flashcards

1
Q

What is thermal conductivity?

A

Measure of how good something is as conducting heat.

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2
Q

Equation for thee change GPE?

A

Mass x gravitational feild strength (10) x Height (change)

MGH

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3
Q

Equation for KE?

A

1/2 Mass x Velocity^2

1/2MV^2

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4
Q

What is the conservation of energy?

A

-Energy cannot be created or destroyed
-only transfered from one fom to another

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5
Q

What happens to eenergy in a closeed system?

A

-No energy dissipates out
-Energy at the start is the same as energy at the end

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6
Q

How are Mechanical processes wasteful?

A

-Energy transfers to others and dissipates to the surroundings

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7
Q

How to reduce energy loss, for moving mechanics?

A

-Lubricant—> Less friction, usually a liquid

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8
Q

How to reduce thermal insulation?

A

-Double glazing windows
-Cavity wall (air gap)
-Fit carpets
-Loft insulation

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9
Q

How does gaps between walls prevent heat loss?

A

-Gas is a poor heat conductor
-Harder for heat to dissipate

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10
Q

How to prevent heat loss through walls?

A

-Thicker walls
-Material that is poor heat conductor (concrete or plastic)
-Aluminium foil behind radiator

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11
Q

the more heat that a material conducts the higher the rate of transfer by conduction across the material

A
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12
Q

How does loft insulation work?

A

-contains fiberglass
-traps air
-Reduces convection (particle movement)

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13
Q

How do doublee glazed windows work?

A

-Trapes air between
-Air is poor conductor of heat

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14
Q

How does Aluminium foil behind radiator work?

A

-Reflects heat

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15
Q

Efficiency =

A

Useful / Total

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16
Q

How can efficiency be increased?

A

-Use waste energy/ recycle
-Reduce waste energy (Insulate/ lubricate)

17
Q

Non renewable resources examples?

finite

A

-Fossil fuels
-Nuclear
-Natural gas/ coal/ oil

18
Q

Renewable resources examples?

A

-Tidal
-Wave
-Hydroelectricity
-Wind
-Solar
-Bio fuel
-Geothermal

19
Q

Geothermal?

A

Description:
-Magma heats rocks which heats water which forms steam to spin a turbinne

Advantages:
- Renewable
- No greenhouse gasses
- Reliable (day and night)

Disadvantages
- Location-specific (volcanic activity)
- High initial cost
- Environmental concerns

20
Q

Tidal?

A

Description:
Tidal energy uses movement of ocean tides to turn turbines or generate electricity through a barrage system.

Advantages:
- Renewable
- No greenhouse gases
- Reliable (predictable tides)

Disadvantages:
- Location-specific
- High initial cost
- Environmental concerns (disruption to marine life)

21
Q

Wind?

A

Description:
-Wind energy uses the movement of air to turn turbines, generating electricity from the kinetic energy of the wind.

Advantages:
- Renewable
- No greenhouse gases
- Low operating cost after installation

Disadvantages:
- Weather-dependent (wind must be strong enough)
- High initial cost
- Visual and noise pollution

22
Q

Solar?

A

Description:
-Solar energy captures sunlight using photovoltaic cells to generate electricity or solar thermal systems to produce heat.

Advantages:
- Renewable
- No greenhouse gases
- Low operating cost after installation

Disadvantages:
- Weather-dependent (requires sunlight)
- High initial cost
- Requires a lot of space for large-scale systems

23
Q

Biofuel?

A

Description:
-Biofuel is produced from organic materials like plants or waste, which are converted into liquid fuels (such as ethanol or biodiesel) to generate energy.

Advantages:
- Renewable
- Reduces waste (can be made from agricultural or industrial by-products)
- Can be used in existing engines and infrastructure

Disadvantages:
- Requires large amounts of land and water for crop production
- Can lead to deforestation or loss of biodiversity
- May produce greenhouse gases during production and use

24
Q

Hydro?

A

Description:
-Hydroelectricity generates power by using the flow of water, typically from a dam, to turn turbines that produce electricity.

Advantages:
- Renewable
- Reliable (consistent water flow)
- Low greenhouse gas emissions

Disadvantages:
- Environmental impact (disrupts local ecosystems)
- High initial cost
- Location-specific (requires suitable river or water source)

25
Q

Wave?

A

Description:
-Wave energy uses the movement of ocean waves to drive turbines or other devices that generate electricity.

Advantages:
- Renewable
- No greenhouse gases
- Reliable (waves are consistent and predictable)

Disadvantages:
- Location-specific (requires coastal areas with strong waves)
- High initial cost
- Potential impact on marine life and ecosystems

26
Q

Fossil fuels?

A

Description:
-Fossil fuels e.g coal/oil/natural gas, formed from the remains of plants and animals, used to generate electricity or power vehicles when burned.

Advantages:
- Reliable and consistent energy supply
- High energy density (provides a lot of power)
- Well-established infrastructure for extraction and distribution

Disadvantages:
- Non-renewable (finite resource)
- High greenhouse gas emissions (contributes to climate change)
- Environmental damage from extraction (e.g., mining, drilling)

27
Q

Nuclear?

A

Description:
-Nuclear energy generates power by splitting atoms (nuclear fission), typically using uranium 235, to produce heat that is used to create steam and drive turbines.

Advantages:
- High energy output (small amount of fuel generates a lot of energy)
- Low greenhouse gas emissions during operation
- Reliable and consistent energy source

Disadvantages:
- Radioactive waste disposal is challenging and hazardous
- Risk of accidents (e.g., nuclear meltdowns)
- High initial cost and long construction time for power plants

28
Q

How have patterns and trends in the use of energy resources changed?

A
  • Larger population larger demand
  • Better technology means rise in renewable
    -Still mainly non-renewable