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An object is in motion if the distance from another object is changing. A reference point is the starting point you choose to describe the location, or position of an object. Position is an object’s distance and direction from a reference point. Displacement is the difference between the initial (first) position and the final position of an object. Distance is the length traveled. 45m 45 m Distance = 90 m Displacement = 0 m Constant Speed = speed stays the same Instantaneous Speed = speed at a specific instant in time. Speed changes when: you slow down you speed up you stop Velocity is the speed AND direction of a moving object. Velocity changes when: speed changes direction changes both change Speed = Distance Time Average Speed = Total Distance Total Time Distance = Speed X Time Time = Distance Speed 1. 2. 3. A mail truck takes 20 s to move between mailboxes that are 10 m apart. What is the average speed of the mail truck? Sound travels 330 m/s. You hear the sound of the bat hitting a home run 0.5 s after you see it. How far away are you? Steve swims 10 m in 20 s. What is his average speed? 4. 5. 6. Two cities are 250 km apart. How much time will it take to travel from one city to the other at 100 km/h? If a train travels 120 km at 30 km/h, how long will it travel? An eagle flies 300 m in 12 s, what was its average speed?