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Motion in One Dimension

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Motion in One Dimension Frame of reference, distance and displacement One-dimensional motion is the simplest form motion One way to simplify the concept of motion is ... – PowerPoint PPT presentation

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Title: Motion in One Dimension


1
Motion in One Dimension
  • Frame of reference, distance and displacement

2
One-dimensional motion is the simplest form motion
  • One way to simplify the concept of motion is to
    consider only the kinds of motion that take place
    in one direction.
  • An example would be the motion of a commuter
    train on a straight track. On a straight track,
    the train can only move forward or backward.
    (Physics Serway/Faughn pg 36 - Holt)

3
Frame of Reference
  • Physicists usually choose a frame of reference
    against which changes in position can be
    measured.
  • The frame of reference
    selected remains fixed
    for the problem
    in question
    and has an origin or
    starting point
    from which
    motion is measured.

4
  • If an object is at rest (not moving), its
    position does not change with respect to a fixed
    frame of reference.
  • For example, the benches on the platform of
    one subway station never move down the tracks to
    another station. (pg37)

5
Distance and Displacement
  • Distance the length of actual travel or how
    much an object has moved.
  • Displacement the length of a straight line
    drawn from the objects initial (starting)
    position to the objects final position.

6
  • Distance is the total length of the objects
    movement, while displacement is the shortest
    distance between initial position and final
    position).

7
  • (pg37)


8
  • Gecko displacement and distance (pg37)
  • about 62cm

9
  • Gecko displacement and distance (pg37)

10
Positive and negative displacement
  • In the Physics text, unless otherwise stated,
    towards the right or east will be considered the
    positive direction, and left or west will be
    negative.

11
  • (pg 38) 1

12
  • 1 answer

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  • 2

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  • 2 answer

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  • 3

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  • 3 answer

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  • 4

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  • 4 answer

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  • 5

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  • 5 answer

21
  • Physics Classroom web site
  • http//www.physicsclassroom.com/Class/1DKin/U1L1c.
    cfm

22
Total displacement is the distance from position
A to position D
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