# P2 1 - Motion

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• Motion P2 1
• Distance-time graphs P2 1.1
• Key Points:
• The distance-time graph for any object that is           1) stationary is a horizontal line    2)moving at a constant speed is a straight line that slopes upwards.
• The gradient of a distance-time graph for an object represents the object's speed.
• Speed in metres per second,m/s = distance travelled in metres,m       --------------- time taken in seconds,s
• distance         ---------------- speed x time
• Velocity an d acceleration P2 1.2
• Key Points:
• Velocity is speed in a given direction
• Acceleration is changeof velocityper second. The unit of acceleration is the metre per second squared (m/s^2)
• Acceleration = changeof velocity divided by time taken.
• Deceleration is the changeof velocity per second when an object slows down.
• a = v-u ---------t
• The distance-time graph for any object that is           1) stationary is a horizontal line    2)moving at a constant speed is a straight line that slopes upwards.
• The gradient of a distance-time graph for an object represents the object's speed.
• Speed in metres per second,m/s = distance travelled in metres,m       --------------- time taken in seconds,s

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