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

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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? Position (d) – the location of an object with respect to a reference point

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

Changing Position Start Finish Reference Point Position 1 Position 2

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

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

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

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

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

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

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

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

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

Example # 4 A snowboarder travels 300m [S] then 175m [20 E of S]. What is the snowboarders 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 boats resultant displacement?

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

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