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Intro to Physics Intro to Motion

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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 ... – PowerPoint PPT presentation

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Title: Intro to Physics Intro to Motion


1
Intro to PhysicsIntro to Motion
  • Frame of Reference
  • Distance vs. Displacement

2
What is Physics?
  • The study of the physical world
  • The interaction of matter and energy through
    forces

3
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?

4
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

5
Frame of Reference Example 1
6
Frame of Reference Example 2
7
  • ?x xf xi
  • ?x (85 cm) (24 cm)
  • ?x 61 cm

8
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?

9
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

10
  • ?x xf xi
  • ?x (24 cm) (85 cm)
  • ?x - 61 cm

11
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

12
Distance vs. Displacement
Total Distance Traveled 6 km
13
Distance vs. Displacement
4.47 km
14
Distance vs. DisplacementTrack Field Examples
Distance Traveled 100m Displacement 100 m East
Distance Traveled 400 m Displacement 0 m
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