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Describing Motion

Describing Motion. Part 1 – Position, Distance and Displacement. Kinematics. The study of motion. What types of motion are there?. What words do you associate with motion? Before we can start describing motion, what is the most important place to start?. Position. What is your position?

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Describing Motion

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  1. Describing Motion Part 1 – Position, Distance and Displacement

  2. Kinematics • The study of motion

  3. What types of motion are there? • What words do you associate with motion? • Before we can start describing motion, what is the most important place to start?

  4. Position • What is your position? • Position (d) – the location of an object with respect to a reference point

  5. Describe your position in the classroom • What should our reference point be?

  6. Changing Position Start Position 1 Finish Position 2 Reference Point

  7. What else can we describe here? Start Position 1 Finish Position 2 Reference Point

  8. How to describe changing position? • Displacement (Δd) • A change in position of an object • The difference between the initial position and the final position

  9. Changing Position Start Displacement - From start to finish Position 1 Finish Position 2 Reference Point

  10. How to describe changing position? • Distance (d) • The length of the path you travel to get from position 1 to position 2

  11. Changing Position Distance – length of path travelled Start Displacement - Direct line from start to finish Position 1 Finish Position 2 Reference Point

  12. The Difference • Displacement • Think spy satellite photos • What happened? • Distance • Think spy satellite video monitoring • How did it happen?

  13. Example # 1: Mohammed runs twice around a 400m track. • What distance did he cover? • What is his displacement?

  14. Example # 2 • A cat walks 4.0m [E], then 9.0 m [W], then 2.0m [E]. What is the cat’s distance and displacement? • Gurganjot moves 1.0m[N] then 3.0m[S] then 12.0m [S] then 18m[N]. What is Gurganjot’s distance and displacement?

  15. Example # 3 • A cat walks 2.5m[N] then 4.0m [W] then 6.0m [S]. What is the cat’s resultant displacement? • Mr. Simnett runs 10m[S] then 14m [E] then 2.0 m [S]. What is his resultant displacement?

  16. Example # 4 • A snowboarder travels 300m [S] then 175m [20 E of S]. What is the snowboarder’s resultant displacement? • A boat cruises around a lake to take in the sights. The boat goes 2.7km[W] then 8.5 km [22S of W]. What is the boat’s resultant displacement?

  17. Example # 5 • A person strolls around the mall walking 20m [E], 14m[15S of E] then 32m [S]. What is the person’s resultant displacement? • A shark swims 400m [E] then 1200m[S] then another 800m [25S of W] before it finds it’s prey. What is it’s resultant displacement?

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