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Speed:
Speed = how fast an object is moving.
Distance-time graphs represent the speed of an object.
Velocity = the speed and direction of an object.
Speed (m/s) = Distance travelled (m)
Time taken (s)

Acceleration:
The acceleration or deceleration of an object is the rate at which its velocity…

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Momentum = a measure of the state of motion of an object. It depends on the mass and velocity of the object.
Momentum has both magnitude and direction.
In a collision or explosion, momentum is conserved providing no external forces act.

Static Electricity:
Static electricity is created when two insulating…

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Atomic number = number of protons. Mass number = number of protons and neutrons.

Radiation:
Background radiation is not harmful.
Ions are charged particles caused by electrons being knocked out of atoms.
Alpha and beta radiation is ionising radiation.

Nuclear Fission and Fusion:
Nuclear fusion = joining of atomic nuclei.…

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