# Speed Distance and Velocity

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• Speed, Distance and Velocity
• Distance- Time Graphs
• Gradient=                     Vertical          ___________ Horizontal
• 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