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Intro to Physics Intro to Motion. Frame of Reference Distance vs. Displacement. What is Physics?. The study of the physical world The interaction of matter and energy through forces. Mechanics. The study of motion When studying motion, three questions need to be answered…

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Intro to Physics Intro to Motion

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Intro to physics intro to motion l.jpg

Intro to PhysicsIntro to Motion

Frame of Reference

Distance vs. Displacement


What is physics l.jpg

What is Physics?

  • The study of the physical world

  • The interaction of matter and energy through forces


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Mechanics

  • The study of motion

  • When studying motion, three questions need to be answered…

    • Where is the object?

    • What is the object doing now?

    • What will the object be doing in the future?


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Where is the object?

  • Position: The separation between the object and some reference point.

  • Frame of Reference (Coordinate System): The context in which we study motion

    • Includes:

      • reference point

      • directional system


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Frame of Reference – Example 1


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Frame of Reference Example 2


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  • x = xf – xi

  • x = (85 cm) – (24 cm)

  • x = 61 cm


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Where is the object now?Where did it used to be?

  • Displacement

  • The change in position relative to a reference point

    • x = xf – xi (Book uses d)

    • Which Unit?


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Vector Quantities

  • Displacement is an example of a vector quantity

  • Vector quantities tell you

    • magnitude (how much?)

    • direction (which way?)

  • Vectors are represented by arrows on drawings


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  • x = xf – xi

  • x = (24 cm) – (85 cm)

  • x = - 61 cm


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Where is the object now?Where did it used to be?

  • Distance: The length of the total trip taken between a starting point and an ending point


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Distance vs. Displacement

Total Distance Traveled: 6 km


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Distance vs. Displacement

4.47 km


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Distance vs. DisplacementTrack & Field Examples

Distance Traveled: 100m

Displacement: 100 m East

Distance Traveled: 400 m

Displacement: 0 m


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