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Motion When is something in motion? Motion- A change in _________ Motion- A change in position Person on chair All motion is relative Reference point The background or object that is being used for comparison _____ is the most common reference point Earth is the most common reference point Speed The rate at which an object moves Speed = Distance Time D S T Average Speed = Total distance total time Example A person ran 30 meters in 10 seconds. What is his speed? Speed = Distance / Time Speed = 30 meters / 10 seconds Speed = 3 meters per second (m/s) Time = Distance Speed D S T Example A person ran at 3 m/s and ran 60 meters. How long did it take him? Time = Distance / Speed Time = 60 m / 3 m/s Time = 20 seconds Distance = Speed x Time D S T Example A person ran at 3 m/s and ran for 10 seconds. How far did he go? Distance = Speed x Time Distance = 3 m/s x 10 s Distance = 30 meters A little tougher After 5 seconds someone is at 100 meters away, and after 15 seconds he is now 120 meters away. What was his average speed? Total distance = 20 meters Totally time is 10 seconds Speed = 2 m/s Units – Speed, Distance or time? Meters Minutes Meter/second Miles Inches Miles/hour Velocity is not Speed? Velocity Speed in a given direction Example – 120 m/s East What is the total velocity? Left Side – page 84 How can something be moving and not moving at the same time? Explain a situation in which an object has a difference in its speed and velocity. GAME TIME!! Speed, Distance, and Time! D = 20 m T=5s S=? S = D/T Speed = 20 m / 5 s Speed = 4 m/s D S T D = 100 mi T = 2 hr S=? S = D/T S = 100 miles / 2 hours D S = 50 miles/hour S T D=? T = 2 min S = 70 mi/min D=SxT Distance = 2 min x 70 miles min D = 140 miles D S T D = 40 m T = ? S = 8 m/s T = D/S T = 40 m / 8 m/s T = 5 seconds D S T Challenge! Come up with a problem using Distance, Time, and Speed to fit the given solution S = D/T Distance: ? Time: ? Speed: 20 m/s T = D/S Distance: ? Time: 5 seconds Speed: ? D=SxT Distance: 50 miles Time: ? Speed: ? Work on ISN pages 86 And 87