1. Motion

2. Part 1

3. Frame of Reference
Frame of reference – nonmoving objects that are used to compare with a moving object
To know how fast something is moving, you need to compare that object with other objects that are around it that are not moving

4. Distance vs. Displacement
Length between 2 points
Usually measured in m, km, cm, etc.
Ex: walk 5 blocks
Displacement
Length AND Direction
Ex: walk 5 blocks north

5. Measuring Displacement
Displacement Along a Straight Line
ADD vectors if they are in the SAME direction
SUBTRACT vectors if they are in OPPOSITE directions
4 km
2 km
Displacement: 6 km
4 km
2 km
Displacement: 2 km

6. Measuring Displacement
Displacement NOT Along a Straight Path
Add/subtract magnitudes of ALL vectors
3 blocks
2 blocks
1 block
1 block
1 + 2 = 3 east
1 + 3 = 4 (north)
3 + 4 = 7
Displacement: 7 blocks Northeast

7. Part 2

8. d υ t Measuring Motion Speed – rate at which an object moves
Distance (d)
Time (t)
Speed: km/h or m/s
Distance (d): km or m
Time (t): hr or s d υ t

9. Measuring Motion Example:
If you travel 120 miles in 2 hours, how fast were you going? (You must label ALL measurements!!!)

10. Types of Speed Constant Speed – speed does not change
Graph is a straight line
Average Speed – speed is not always constant
Graph is not a straight line

11. Velocity Velocity – speed in a given direction Ex: 100 km/h is speed
100 km/h North is velocity
Land, sea, and air travel all involve the use of velocity
Calculate velocities by ADDING those in the the same direction and by SUBTRACTING those in opposite directions

12. Final Velocity (vf) – Initial Velocity (vi)
Changes in Velocity
Acceleration – rate of change in velocity
Speeding up
Graph curves upward
Deceleration – negative acceleration
Slowing down
Graph curves downward
Final Velocity (vf) – Initial Velocity (vi)
Accleration (a) =
Time (t)