1. Speed Velocity Acceleration
Describing Motion
Speed
Velocity
Acceleration

2. Speed Average speed Distance moved per unit time Average speed = Units
ms-1
distance moved
time taken

3. Distance and speed are scalar quantities
Scalar Quantity
Magnitude
Number and unit
Vector Quantity
Magnitude and direction

4. Vector Quantities Displacement Velocity Distance + direction
Displacement = final position – initial position
Velocity
Speed + direction
Average velocity =
displacement
time taken

5. Acceleration The rate of change in velocity Change in speed
Speeding up
Slowing down
deceleration
Change in direction
Both
Average Acceleration =
change in velocity
time taken

6. Graphs
Distance versus time
Slope of the graph = average speed

7. Graphs

8. Example Calculate Albert's and Bob’s average speeds.
Calculate Charlie’s average speed between
0 and 8 s
8 and 13 s
13 and 17 s

9. Graphs Speed versus time Slope of the graph = average acceleration
Area under the graph = distance traveled

10. Speed and Acceleration
Calculate the average acceleration between
0 and 5 s
10 and 13 s
16 and 21 s

11. Speed and Acceleration
Calculate the distance traveled between
0 and 5 s
0 and 13 s
Calculate the total distance traveled

12. The End