- A body will remain at rest or in uniform motion in a straight line unless it is compelled to change this state by forces impressed upon it.
- A body acted upon by an external unbalanced force will accelerate in proportion to the magnitude of this force in the direction in which this force acts.
- To every action (or force) there is an equal and opposite reaction (or force).
Scalar and vector quantities
| Mass | 10kg | Area | 7m^2 |
|---|---|---|---|
| Length | 5m | Volume | 2m^2 |
| Time | 3s | Volume | 1 litre |
Vector quantities
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Force 100N up
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Displacement 5m south
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Velocity 7ms^-1 west
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Acceleration 10ms^-2 down
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A vector quantity has magnitude, direction and sense.
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Statics - things that don’t move
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Dynamics - things that move
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Kinematics - study of motion through analysis of displacement, velocity and acceleration
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Kinetics - study of motion by analysis of forces.