1. Distance and Displacement

2. Motion
An object is in motion when its distance from another object is changing.
If no change 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 observer’s 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
Car travels = m or km

5. Displacement is a distance with a direction attached to it.
Displacement: the direction from the starting point and the length of a straight line from the starting point to the ending point.
Displacement is what we use to give people directions to our house.
Ex: Walk 5 blocks north from the school; take a
right
Displacement is a distance with a direction attached to 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:
5 km km
= 15 km
10 km km
10 – 3 = 7 km