# Keys words and terms, with definitions

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Linear Motion
When a body moves in a straight or curved line, with all its part moving in the same direction, speed, and distance
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Angular Motion
When a body or part of a body moves in a circle/ part of a circle about a particular point- axis of rotation
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General Motion
A combination action of linear and angular motion.
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Newton's 1st Law (Law of Inertia)
a body continues in a rest or uniform velocity inless acted upon by an external force
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Newtons's 2nd Law (Law of Acceleration)
When a force acts on an object, changing the rate of momentum experienced by the object is proportional to the size of the force & takes place in the direction in which the force acts.
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Newton's 3rd Law
For every action there is an equal and opposite reaction.
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Mass
How much matter is in an object.
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Centre Of Mass
The point at which the mass of an object could be concentrated without affecting the behaviour of the body by external forces.
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## Other cards in this set

### Card 2

Angular Motion

#### Back

When a body or part of a body moves in a circle/ part of a circle about a particular point- axis of rotation

General Motion

### Card 4

#### Front

Newton's 1st Law (Law of Inertia)

### Card 5

#### Front

Newtons's 2nd Law (Law of Acceleration)