P2 - Unit 2

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What is resultant force?
A single force that has the same effect as all the forces acting on an object.
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What is used to improve car safety?
Seat belts, air bags, impact bars and crumple zones.
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What is alternating current (A/C)?
Current that is repeatedly reversing it's direction.
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What colour is the earth wire?
Green and yellow,
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What colour is the neutral wire?
Blue.
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What colour is the live wire?
Brown.
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What is a fuse?
Contains a thin wire that melts if too much current passes through it - cutting off the current.
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What is a circuit breaker?
An electromagnet switch that 'trips' and cuts off the current if too much current passes through.
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What is a residual current circuit breaker?
If the live wire current is different to the current in the neutral wire it cuts off the current.
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What is radioactive decay?
When an unstable nuclei of a radioactive substance tries to become stable by emitting radiation and turn into other elements.
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What is alpha radiation stopped by?
Paper or a few centimetres of air.
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What is beta radiation stopped by?
Thin metal or a metre of air.
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What is gamma radiation stopped by?
Thick lead and has an unlimited range in air.
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What is nuclear fission?
The splitting of the nucleus into 2 equal fragments, and the release of 2 or 3 neutrons.
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What is nuclear fusion?
The process of forcing 2 nuclei close enough together they form a single, larger nucleus.
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What is an example common fissionable isotopes?
Uranium-235 and Plutonium-239
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What is a protostar?
Gas and dust cloud in space that can go on to form a star.
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How is a neutron star (black hole) formed?
A high mass star -> protostar -> main sequence star -> red supergiant -> supernova -> neutron star if mass is high enough.
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How is a black dwarf formed?
A low mass star -> protostar -> main sequence star -> red giant -> white dwarf -> black dwarf.
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Other cards in this set

Card 2

Front

What is used to improve car safety?

Back

Seat belts, air bags, impact bars and crumple zones.

Card 3

Front

What is alternating current (A/C)?

Back

Preview of the front of card 3

Card 4

Front

What colour is the earth wire?

Back

Preview of the front of card 4

Card 5

Front

What colour is the neutral wire?

Back

Preview of the front of card 5
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