1 / 21

Understanding Motion: Distance, Displacement, and Speed

Explore distance, displacement, speed, and velocity in motion. Learn the differences and calculations between these concepts using examples and illustrations.

vanmeters
Download Presentation

Understanding Motion: Distance, Displacement, and Speed

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Motion Speed

  2. Motion • Motion: A change in position • Depends on reference point • Is the mom moving relative to the dad? • Is the mom moving if you were on the side of the road?

  3. Distance vs. Displacement • What is distance? • How is displacement different from distance? • What is speed? • What is velocity?

  4. 1 2 3 4 5 6 7 8 9 10 Distance • Distance (d) – how far an object travels. • Does not depend on direction. • Imagine an ant crawling along a ruler. • What distance did the ant travel? • d = 3 cm

  5. 1 2 3 4 5 6 7 8 9 10 Distance • Distance is scalar which means magnitude or quantity. • Now what distance did the ant travel? • d = 3 cm • Does his direction change the answer?

  6. 0 1 2 3 4 5 6 7 8 9 10 Distance • Distance does not depend on direction. • Let’s follow the ant again. • What distance did the ant walk this time? • d = 7 cm

  7. Displacement • Displacement (x) – difference between an object’s final position and its starting position. • Does depend on direction. • Displacement = final position – initial position • x = xfinal – xinitial • In order to define displacement, we need directions. • Examples of directions: • + and – • N, S, E, W • Angles

  8. Displacement vs. Distance • Example of distance: • The ant walked 3 cm. • Example of displacement: • The ant walked 3 cm EAST. • An object’s distance traveled and its displacement aren’t always the same!

  9. - + 1 2 3 4 5 6 7 8 9 10 Displacement • Find the distance and displacement of the ant. • Distance: 7 cm • Displacement: +3 cm

  10. An athlete runs around a track that is 100 meters long three times, then stops. What is the athlete’s distance and displacement? Distance = 300 m Displacement = 0 m Why? Displacement vs. Distance

  11. Speed • The distance an object moves in a certain amount of time • Formula:

  12. Unit for Speed • Since the formula is • Then the unit for speed must be a unit of distance divided by a unit of time. • For example: • km/h • m/s

  13. Speed • Look familiar? • Knowing any of the 2 variables, you can solve for the 3rd.

  14. Calculating 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

  15. Graphing Speed

  16. Interpreting Graphs • The shape, or slope, of the line tells the story!

  17. Interpreting a Graph • Now you try! • What does each graph tell you?

  18. Tell the Story! • What story does the graph tell you as you ride your bike to your friend’s house?

  19. Interpret This Graph

  20. Scalar vs. Vector • Scalar Quantity – has magnitude but not direction. • Distance and speed are scalar quantities. • Vector Quantity – has magnitude and direction. • Displacement and velocity are vector quantities.

More Related