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

13

• 2

14

• 2 answer

15

• 3

16

• 3 answer

17

• 4

18

• 4 answer

19

• 5

20

• 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
23
(No Transcript)
24
(No Transcript)
25
(No Transcript)
26
(No Transcript)
27
(No Transcript)
28
(No Transcript)