1. Distance and Displacement
Chapter 11.1
Distance and Displacement

2. Motion
An object is in motion when its distance from another object is changing.
If no chance than no motion is perceived

3. Frame of Reference
Frame of reference is a place or object that you assume is fixed
observations of how objects move in relation to that frame of reference.
perception of motion depends on the observers frame of reference.
Humans usually use the earth as their frame of reference.

4. Measuring Distance Distance: The length of a path between 2 points.
Distance is measured according to the amount of distance involved
EX:
Marble rolls= mm or cm (millimeters or centimeters)
Car travels= m or Km ( meters or kilometers)

5. a distance with a direction associated with it
Displacement
Displacement: the direction from the starting point and the length of a strait line from the starting point to the ending point.
Displacement is what we use to give people directions to our house.
Ex: walk north 5 blocks from the school take a right
a distance with a direction associated with it

6. Displacement Vs distance

7. Combining Displacements
An example of this is a vector.
This is a quantity that has a magnitude and a direction
Magnitude= size length or amount
Arrows on a graph are used to represent vectors.
The length of an arrow shows the magnitude of a vector

8. Examples Combining displacements
Vector addition is the combining of vector magnitudes and directions
EX:
5km 10km
5 + 10= 15km
10km 3km
10 – 3= 7 km