1. Speed Formula
Quarter 4

2. Speed Comparison of time and distance Three ways to calculate speed:
Distance traveled per unit time
Three ways to calculate speed:
Average speed - Rate of motion calculated by dividing the distance traveled by the amount of time it takes to travel that distance
Constant speed - Speed that does not change
Instantaneous speed - Speed of an object at any given time

3. Calculating Speed Given Distance & Time
Divide Distance by Time
Distance ÷ Time = Speed
Speed = Distance ÷ Time

4. Calculating Distance Given Speed & Time
Multiply Speed and Time
Distance = Speed X Time
Speed X Time = Distance

5. Calculating Time Given Distance and Speed
Divide Distance by Time
Distance ÷ Speed = Time
Time = Distance ÷ Speed

6. Example 1 Speed = distance ÷ time Speed = 300km ÷ 6 hours
A car travels 300km in 6 hours. What is the speed of the car?
Speed = distance ÷ time
Speed = 300km ÷ 6 hours
Speed = 50km/hr

7. Example 2 How far can a plane travel if it flies 800km/hr for 9 hours?
Distance = Speed ▪ Time
D = 800km ▪ 9hrs hr
D = 7,200 km

8. Example 3
How long does it take a ship to go 500 km if it travels at a speed of 50km/hr?
Time = Distance ÷ Speed
T = 500 km ÷ 50 km/hr
T = 10 hr