Motion

• Motion


  When an object moves, it is said to be in motion
• Linear motion


  Movement in a straight line
• Speed


  Describes how fast an object in motion travels from one position to another
• Calculating speed


  1. Measure the distance the object travels

  2. Measure the time it takes to travel that distance

  3. Speed = distance / time
• Unit for speed


  m/s (metres per second)
• Distance-time graph


  Shows distance on the y-axis and time on the x-axis
• A distance-time graph can be used to calculate an object's speed
• Velocity describes the speed of an object in motion and the direction it travels in
• Velocity


  Describes the speed of an object in motion and the direction it travels in
• Difference between speed and velocity


  Speed is distance / time, velocity is speed with direction
• Acceleration is the rate at which the velocity of an object changes
• Unit for acceleration


  m/s^2 (metres per second squared)
• Velocity-time graph


  Shows velocity on the y-axis
• To calculate acceleration from a velocity-time graph, divide the change in velocity by the time taken