# Acceleration & Speed How fast does it go?. Definition of Motion Event that involves a change in the position or location of something.

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Acceleration & Speed How fast does it go?

Definition of Motion Event that involves a change in the position or location of something.

Speed Comparison of time and distance –Distance traveled per unit time

Average Speed Speed over a period of time

Speed Instantaneous Speed Speed at any instant

Speed Constant Speed Speed that does not change –Instantaneous speed that does not change

Velocity Speed AND direction

Acceleration A change in velocity –Speeding up Positive acceleration –Slowing down Negative acceleration Deceleration –Changing direction

Calculating Speed Given Distance & Time Divide Distance by Time Distance ÷ Time = Speed Speed = Distance ÷ Time D ST Speed = Distance Time

Let’s Practice Solve for Speed A runner completes a 400m race in 43.9s. What was his speed? Speed = Distance Time Speed = 400m 43.9s Speed =9.1m/s 2

Let’s Practice Solve for Speed A runner runs a 100m race in 10s. What is his speed? Speed = Distance Time Speed = 100m 10s Speed = 10m/s 2

Calculating Distance Given Speed & Time Multiply Speed and Time Distance = Speed X Time Speed X Time = Distance D ST Distance =Speed Time

Calculating Time Given Distance and Speed Divide Distance by Time Distance ÷ Speed = Time Time = Distance ÷ Speed D ST Time = Distance Speed

Calculating Acceleration Acceleration Equation Acceleration = (final speed (in m/s) – initial speed (in m/s)) Time (in seconds) A= (s f -s i ) t

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