# Physics paper 1 keywords and equations

• Created by: GMay10
• Created on: 13-05-18 11:35
System
An object or group of objects
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Kinetic energy
0.5 x mass x (speed)2
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Gravitational potential energy
Mass x gravitational field strength x height
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Elastic potential energy
0.5 x spring constant x (extension)2
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Internal energy
Total kinetic and potential energy of all the particles that make up a system
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Specific heat capacity
The amount required to raise the temperature of 1 kg of the substance by 1 degree celcius
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Change in thermal energy
Mass x specific heat capacity x temperature change
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Dissipated
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Renewable
Can be replaced
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Current
The flow of electrical charge
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Charge flow
Current x time
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Resistance
Measure of how it resists the flow of charge
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Potential difference
The difference in electrical potential from one point in a circuit tot another
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Potential difference
Current x resistance
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Ohmic conductor
A resistor where the current is directly proportional to the potential difference at a constant temperature
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Diode
A current through this will only flow in one direction
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Power
Depends on the potential difference across it and the current flowing through it
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Power
Potential difference x current or (current)2 x resistance
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Direct current
Has a direct potential difference
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Alternating current
Has an alternating potential differnence
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Efficiency
The ratio of useful energy out to total energy in
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Efficiency
Useful energy transfer / Total energy transfer or Useful power output / total power input
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Energy transferred
Power x time or charge flow x potential difference
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National grid
A system of cables and transformers linking power stations to homes and buisnesses
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States of matter
Solids, liquids and gases
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Incompressible
Cannot be squashed
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Density
The mass per unit volume of a material
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Density
Mass / volume
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Energy for a change of state
Mass x specific latent heat
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Latent heat of fusion
The energy needed for a substance to change from solid to liquid
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Latent heat of vaporisation
The energy needed for a substance to change form liquid to gas
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Sublimation
Something changes from a solid to a gas without changing to a liquid in the middle
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Atomic number
The number of protons in an atom of an element
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Isotopes
Atoms of the same element that have different numbers of neutrons
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The rate at which it decays
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Contamination
The unwanted presence of materials containing containing radioactive atoms of other materials
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The process of exposing an object to nuclear radiation
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Half-life
The average time it takes for half of the nuclei to decay
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## Other cards in this set

### Card 2

#### Front

0.5 x mass x (speed)2

Kinetic energy

### Card 3

#### Front

Mass x gravitational field strength x height

### Card 4

#### Front

0.5 x spring constant x (extension)2

### Card 5

#### Front

Total kinetic and potential energy of all the particles that make up a system