Motion

• The distance between two points is how far away they are
• Displacement measures distance and specific direction
• Speed is the rate distance travelled changes with time
• Velocity is speed in a particular direction
• Average speed = distance / time taken (m/s)
• Average velocity = total displacement / total time taken (m/s)
• Rate of change of speed = final - initial speed / time taken (m/s²)
• average speed = initial + final speed / 2
• Acceleration = final - initial velocity / time taken (m/s²)
• If the starting and finishing position are the same, the displacement will be 0, and the average velocity will be 0
• Acceleration is the change in velocity with time
• Average velocity = initial + final velocity / 2
• Positive velocity → Velocity is increasing (accelerating)
• Negative acceleration → velocity is decreasing (retarding)
• A scalar quantity has magnitude but not direction
• A vector quantity has magnitude and direction
• The gradient of a distance time graph represent speed
• The gradient of a speed-time graph represents rate of change in speed.
• The area of a speed time graph represents distance
• Gradient of a displacement time graph represents the object's velocity
• The gradient of a velocity time graph represents acceleration
• The area of a velocity time graph represents the displacement.