# Physics - P2.1 - Motion

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## P2.1.1 - Distance-Time Graphs

• Graphs help describe motion of objects - distance-time graph shows distance object moves from point (y-axis) against time taken (x-axis)
• Speed: distance travelled each second - represented by gradient - steeper the gradient = faster object moves, horizontal line = object stationary, constant speed = straight line
• Speed (m/s) = distance travelled (m) / time taken (s)
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## P2.1.2 - Velocity and Accelaration

• Velocity: speed of object in given direction - change direction = change velocity, even if speed stays same - change in velocity = acceleration
• a = (v - u) / t
• a - acceleration (m/s2)
• v - final velocity (m/s)
• u - intial velocity (m/s)
• t - time taken (s)
• Acceleration = negative - deceleration
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## P2.1.3 - More About Velocity-Time Graphs

• Velocity-time graph shows velocity of object (y-axis) against time taken (x-axis)
• Horizontal line = 0 acceleration = object moving at constant speed
• Negative gradient = object decelerating
• Area under the = distance travelled in given time - bigger area = greater distance
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## P2.1.4 - Using Graphs

• Gradient of distance-time graph = speed
• Gradient of velocity-time graph = acceleration
• Area under the line of velocity-time graph = distance travelled
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