1. Motion can be descibed alond 3 axis: x,y, z
Frames of Reference
In physics motion is relative to the frame of reference agains which it is studied, from an observers point of view.
We choose a frame of reference to allow for a simple description of motion
Motion can be descibed alond 3 axis: x,y, z
rachel&Jaclyn.mov

2. At an airport, there are moving sidewalks.
If a person were on the walking carpet and dropped an apple, for example,
a) What would the motion look like from someone who is also on the moving carpet
i: beside her
ii in front of/behind her
b) What would the motion look like if the observer were not on the moving sidewalk...

3. Average Velocity: Total displacement divided by time over a fairly long time interval.
Average Speed: Total distance divided by time over a time interval
Instantaneous Velocity:
the velocity at a given moment.(a flash)
We can say that it is equal to the displacement divided by time on condition that this time interval is very short (a snippet of time)

4. How to determine instantaneous velocity on a displacement vs time graph.
URM (no acceleration) it is the slope of the straight line
UARM: The slope is changing, we have to determine the curve's slope at that precise point in time.
Take the tangent: a straight line that represents the slope of the curve at that precise time.

6. Find the instantaneous velocity at 3s, and 9 s.
Try page 229, 5
p. 242 , 2

7. Attachments
rachel&Jaclyn.mov