1. SWABT define and calculate Speed and Velocity.
OBJECTIVES
SWABT define and calculate Speed and Velocity.

2. Vocabulary
Speed
Velocity
Instantaneous Speed
Instantaneous Velocity

3. Speed Speed is a measure of how fast something moves. SI unit: m/s
other: miles/h , km/h (for long distances)
Speed is a scalar quantity
Speed is always positive.

4. Average speed

5. Velocity
Velocity is change in displacement at a given time and in given direction.
Velocity is a vector quantity
Velocity Magnitude (SPEED) + Direction
Unit of Velocity m/s, miles/h, km/h
Velocity is positive for positive displacement ( moving to right, east or + ve direction)
Velocity is negative for negative displacement (moving to left, west or - ve direction)

6. Average velocity

9. Velocity and Speed Train engineers use speed only.
speed = 90 km/h
Pilots use velocity (direction & speed).
speed = 300 km/h
direction = west

10. Instantaneous velocity
The velocity at any instant is called instantaneous velocity.

11. An object’s speed at any given instant is Instantaneous speed.
Speedometer tells the car’s speed at any instant.

16. Khan Academy