Speed How fast does it go?

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

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

Let’s Practice Solve for Speed A runner completes a 400m race in 43.9s. What was his speed? Distance Speed = Time 400m Speed = 43.9s Speed = 9.1m/s2

Let’s Practice Solve for Speed A runner runs a 100m race in 10s. What is his speed? Distance Speed = Time 100m Speed = 10s Speed = 10m/s2

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

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

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

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