1. Velocity (Speed)

3. Average Speed (Vav) – the total distance divided by the total time for a trip
Delta (∆) – “change in”
∆d – change in distance ∆d = df - di
∆t – change in time ∆t = tf - ti

4. Instantaneous Speed – the speed at which an object is traveling at a particular instant in time
Constant Speed – Uniform Motion

5. Calculating Average Speed
When solving problems, GUESS:
G iven – Write down all knowns (with units)
U nkown – Write what you’re trying to find
E quation – Write down the formula to be used
S olve (plug in) – Fill in your formula with knowns (including units)
S olution (units & SF) – Write the answer with units AND proper sig figs

6. Need to Know: Manipulating Formulas!
Solve for t. Show your work!
Vav

7. Solve for d. Show your work!
Vav

8. Need to Know: Units We will be working with the following units:
- Velocity – always distance over time
Write in different velocity units:
Km/hr
m/s
Miles/hour

9. - Distance
Write in different distance units: Km
Miles m

10. - Time Write in different time units: Seconds (s) Minutes (min)
Hours (hr)

11. What are your knowns? Use the units as a hint!
1. Joshua skates to school, a total distance of 4.5 km. He has to slow down twice to cross busy streets, but overall the journey takes him 0.62h. What is Joshuas’s average speed during the trip?