# Motion

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## Distance time graphs

• Avg. speed= Distance / Time
• A straight line means that the object travels at constant speed
• The steeper the gradient, the faster the speed
• A horizontal line means that the object has stopped moving
• If the gradient of the line curves up, it means that the object is getting increasingly faster
• A car and a motorbike are accelerating from standstill. If the motorbike has greater acceleration that the car, the car's distance- time curve will stay below the motorbike's
• A line of decreasing gradient means that the object is slowing
• If the motorbike breaks harder that the car, the motorbike's distance- time curve will stay above the car's
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## Velocity, Speed & Acceleration

• Velocity is speed in a particular direction, eg.
• 10 m/ph, due north
• Speed is how fast something is travelling, eg.
• 10 m/ph

Acceleration:

• How quickly the velocity/ speed is changing, eg.
• Start: 5 m/ph , End: 25 m/ph , Time Taken: 4 secs
• The velocity changes by 5 m/ph each second, so we show this by: 5 m/s
• This means that the velocity increases by 5 m/s each time

Acceleration (m/s ) = Change in velocity / time taken (s)

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## Velocity time graphs

• A straight diagonal line means that the object travels with constant acceleration
• The steeper the slope, the faster the acceleration
• Straight lines with a negative gradient mean that the object is slowing
• A flat line means that the object is moving at a constant velocity
• While the object is at rest, the line will be a straight line along the x axis
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