A measure of how quickly the velocity of something is changing. It can be positive if the object is speeding up or negative if the object is slowing down.
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Action
In physics, one of a pair of forces. The reaction force acts in the opposite direction and on a different object.
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Activity
The number of emissions of ionising radiation from a sample in a given time. This is usually given in Becquerel.
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Air Bag
Road safety device in which a bag suddenly inflates with gas to act as a cushion and reduce injury.
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Air Resistance
The force opposing the motion of the object moving through the air, sometimes called drag.
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Alpha Particles
The largest of the particles that can be emitted as radiation from an unstable nucleus. It consists of two protons and two electrons and is equivalent to a helium-4 nucleus.
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Other cards in this set
Card 2
Front
In physics, one of a pair of forces. The reaction force acts in the opposite direction and on a different object.
Back
Action
Card 3
Front
The number of emissions of ionising radiation from a sample in a given time. This is usually given in Becquerel.
Back
Card 4
Front
Road safety device in which a bag suddenly inflates with gas to act as a cushion and reduce injury.
Back
Card 5
Front
The force opposing the motion of the object moving through the air, sometimes called drag.
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