Speed Distance and Velocity

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  • Speed, Distance and Velocity
    • Distance- Time Graphs
      • Gradient=                     Vertical          ___________ Horizontal
      • Gradient= Speed
      • Flat sections are where it's stationary
      • The steeper the gradient, the faster it's going
      • "Downhill" sections mean it's coming back towards starting point
      • Curves represent acceleration or deceleration
      • A steepening curve means it's speeding up (increasing gradient)- accelerating
      • A levelling-off curve means it's slowing down (decreasing gradient)- decelerating
      • Displacement-Time Graphs are the same but the gradient tells you the velocity
    • Displacement
      • Distances can be referred to as positive or negative
      • An object can be going in one direction or the opposite direction
      • When the direction is given with a particular indication of direction it's called displacement
    • Speed compared to Velocity
      • The speed is just how fast it's going- the direction isn't important
      • Velocity is  sometimes a more useful measure of motion, because it describes both speed and direction
      • Instantaneous velocity is its speed and direction at a given moment in time
      • You can also have negative velocities
      • If two objects are heading in opposite directions, you can say that one has a positive velocity and the other has a negative velocity
  • Instantaneous velocity is its speed and direction at a given moment in time

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