Chapter 3: motion

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10 Terms

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Displacement

The straight-line distance and direction from an object's starting point to its finishing point

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Velocity

The rate of change of displacement

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Acceleration

The rate of change of velocity

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Instantaneous speed

The speed of an object at a specific moment in time

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Average speed

Total distance travelled divided by the total time taken

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Free-fall

The motion of an object when the only force acting on it is gravity

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Terminal velocity

The constant maximum velocity reached by a falling object when drag equals weight (resultant force is zero)

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Thinking distance

The distance travelled by a vehicle during the driver's reaction time before the brakes are applied

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Braking distance

The distance travelled by a vehicle from the moment the brakes are applied until it stops

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Stopping distance

The sum of the thinking distance and the braking distance