Speed-Time Graphs Speed Time
Remember Distance-Time Graphs? Speed Distance Time With distance on the y axis and time on the x axis we could measure SPEED
Speed Time Acceleration Speed-Time Graphs Speed Time Acceleration When the y axis is speed, (and x is time) we can calculate the acceleration!
So… for a Speed-Time Graph… What is on the x axis? Time What is on the y axis? Speed What can we find using a speed-time graph? Acceleration
An Object at Rest An object at rest is not moving, so its speed is 0 The speed-time graph for an object at rest is a horizontal line at y=0
Constant Speed The speed is a number, but doesn’t change
Speeding Up Accelerates at a steady rate over time, so, acceleration is a straight line
Slowing Down We have a constant, negative acceleration, so we use a downward straight line!
Limits of Speed-Time Graphs Can’t show direction Show only the relationship between speed and time there are also changes in velocity due to changes in the object’s direction
Acceleration Practice in Book Pg. 33 #’s 1-8