P2 Keywords

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  • Created by: ShakiraB
  • Created on: 12-03-16 16:01
Acceleration
Rate at which an object speeds up, calculated from change in velocity divided by time
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Air Resistance
Force resisting the movement of an object travelling through air
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Alpha Particle
Particle emitted from the nuclei of radioactive atoms and consisting of two protons and two neutrons
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Alternating Current (AC)
Electric current where the direction of the flow of current constantly reverses, as in mains electricity
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Ampere (amp)
Unit used to measure electrical current
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Amplitude
Size of wave oscillations - for a mechanical wave, how far the particles vibrate around their central position
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Atom
The basic 'building block' of an element that cannot be chemically broken down
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Atomic Number
Number of protons in the nucleus of an atom
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Attraction
Force that pulls, or holds, objects together
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Average Speed
Total distance of a journey divided by total time taken
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Background Radiation
Low level nuclear radiation that exists everywhere, from rocks and other environmental sources
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Balanced Forces
System of forces with no resultant force
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Beta Particle
Type of nuclear radiation emitted as an electron by a radioactive nucleus
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Braking Distance
Distance a vehicle travels before stopping, once the brakes are applied
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Cathode
Negative electrode
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Chain Reaction
A series of nuclear fission reactions where neutrons released from one reaction cause another nuclear fission reaction and so on
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Charge
Particles or objects can be positively or negatively charged, or neutral: similar charges repel each other, opposite charges attract
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Critical Mass
The minimum mass of nuclear fuel needed to make a chain reaction happen
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Crumple Zone
Part of a vehicle designed to absorb energy in an accident, so reducing injuries to passengers
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Current
Flow of electricity around a circuit - carried by electrons through solids and by ions through liquids
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Deceleration
Rate at which an object slows down, calculated by change in velocity divided by time
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Diode
Semiconductor device that allows an electric current to flow through it in only one direction
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Direct Current (DC)
Electric current where the direction of the flow of current stays constant, as in cells and batteries
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Distance-Time Graph
Graph showing how the distance an object travels varies with time: its gradient shows speed
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Other cards in this set

Card 2

Front

Force resisting the movement of an object travelling through air

Back

Air Resistance

Card 3

Front

Particle emitted from the nuclei of radioactive atoms and consisting of two protons and two neutrons

Back

Preview of the back of card 3

Card 4

Front

Electric current where the direction of the flow of current constantly reverses, as in mains electricity

Back

Preview of the back of card 4

Card 5

Front

Unit used to measure electrical current

Back

Preview of the back of card 5
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