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Understanding Speed and Velocity

Learn the difference between speed and velocity, and how to calculate them. Explore examples and understand the importance of direction in velocity.

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Understanding Speed and Velocity

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  1. Speedvs Velocity

  2. Learning Target • I can explain the difference between speed and velocity.

  3. Speed • Speed (s) – Rate at which an object is moving. • How fast is the object moving? • speed = distance / time • s = d/t • Like distance, speed does not depend on direction.

  4. 100 m Speed • A car drives 100 meters in 5 seconds. • What is the car’s average speed? • s = d/t • s = (100 m) / (5 s) = 20 m/s 1 s 2 s 3 s 4 s 5 s

  5. Speed • A rocket is traveling at 10 km/s. How long does it take the rocket to travel 30 km? • 3 seconds (t=d/s)

  6. Speed • A racecar is traveling at 85.0 m/s. How far does the car travel in 30.0 s? • d=s∙t • d= 2,550m

  7. Velocity • Velocity (v) – is speed with direction. • velocity = distance / time (include the direction) • v = d / t • Directions include: north, south, east, west, + (positive), - (negative)

  8. Velocity • Back to the racecar: • A racecar is traveling east for 2,550 m. What is the velocity of the car after 30.0 s? • v=d/t • v= 85 m/s east

  9. Velocity • You walk to your friends house which is to the west of your house and 800 m away. It takes you 5 minutes to get there. What is your velocity? • v=d/t • v= 160 m/min west

  10. Velocity • You go on a family road trip to Baker City, Oregon. It is 496 km away. Your dad drives slow. His average velocity is 70 km/hr east. How long is it going to take to get there? • t=d/v • t= 7 hours

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