# Topic 2 - Conservation of Energy

What is the equation for Gravitational Potential Energy? (GPE)
GPE (J) = mass (kg) x gravitational field strength (N/kg) x height (m) GPE = m x g x h
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What is the equation for Kinetic Energy? (KE)
Kinetic Energy (J) = 1/2 x mass (kg) x speed2 (m/s) KE= 1/2 x m x v2
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What is meant by conservation of energy?
Conservation of energy means energy is never created or destroyed. Energy can be stored, transferred between stores, and dissipated - but it can never be created or destroyed. The total energy of a closed system has no net change.
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Energy transfers
Energy can be transferred between stores in four main ways: *Mechanically- a force acting on an object *Electrically- a charge doing work against resistance *By heating- energy transferred from a hotter object to a colder object...
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Energy transfers (continued)
*By radiation- energy can be transferred by waves
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What is the equation for efficiency?
efficiency = useful energy transferred by the device ÷ total energy supplied to the device
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What are renewable energy sources? Name some examples
Renewable enrgy sources are energy sources which can never run out. Some examples are: *Geothermal *Solar *Biomass *Water *Wind
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What are non renewable energy sources? Name some examples
Non renewable energy sources are energy sources which will eventually run out. Some examples are: *Natural Gas *Coal *Oil *Nuclear
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## Other cards in this set

### Card 2

#### Front

What is the equation for Kinetic Energy? (KE)

#### Back

Kinetic Energy (J) = 1/2 x mass (kg) x speed2 (m/s) KE= 1/2 x m x v2

### Card 3

#### Front

What is meant by conservation of energy?

Energy transfers

### Card 5

#### Front

Energy transfers (continued)