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CCEA Double Award Physics Unit 1 - Defintions 2024/2025 already graded A+
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CCEA Double Award Physics Unit 1 - Defintions 2024/2025 already graded A+
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CCEA Double Award Physics Unit 1 -Defintions
Mass - ANSThe amount of matter in an object
Weight - ANSThe force due to the pull of gravity on an object
Vector quantity - ANSHas size and direction
Scalar quantitiy - ANSHas size only
Negative acceleration - ANSRetardation
Isotope - ANSAtoms of the same element (same number of protons) that have different
numbers of neutrons
Background count - ANSRadioactivity due to natural radioactivity with no other radioactive
sources present
Ionisation - ANSWhen an atom gains or loses one or more electrons
Half-life - ANSTime taken for half the unstable nuclei to decay
Fission - ANSHeavy nucleus absorbs a neutron and splits into 2 smaller nuclei, releasing
energy
Fusion - ANSTwo light nuclei join into one larger nucleus, releasing energy
First law of motion - ANSA body at rest will stay at rest and a body moving will continue to move
with a constant speed in a straight line unless a resultant force acts on it
Second law of motion - ANSIf the resultant force acting on a body isn't zero, the body will
accelerate in the direction of the resultant force directly proportionally to the resultant force
Hooke's law - ANSExtension is directly proportional to the stretching force provided the limit of
proportionally isn't exceeded
Pressure - ANSForce per unit area
Centre of gravity - ANSThe point on an object where the entire weight/mass it appears to act
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