1. Cornell Notes 2-1-1 What Is Speed – The Formula
Page 33
October 12, 2017

2. Gravity and Kinetic Energy Course, 1.1: Speed Tracks
Focus question (10/12/2017)
What is speed?
Gravity and Kinetic Energy Course, 1.1: Speed Tracks
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3. What We Learned So Far More Distance = More Speed
More Time = Less Speed
Delta (Δ) Means Change
Calculate Change by Subtracting
In a Position vs Time (PvT) Graph, a Steeper Slope Means a Higher Speed

4. Develop speed equation
Is there an equation we can use to calculate speed?
Gravity and Kinetic Energy Course, 1.1: Speed Tracks
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5. Develop speed equation
Speed (v) is defined as change in position divided by change in time. Distance/Time We can write an equation that can be used for calculating speed.
Gravity and Kinetic Energy Course, 1.1: Speed Tracks
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6. Develop speed equation
Teacher master B, Speed Equation
Gravity and Kinetic Energy Course, 1.1: Speed Tracks
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7. Speed equals Distance Over Time!

8. Three Identical Cousins
v = Δx/Δt (Speed equals distance over time)
Δx = (v)(Δt) (Distance equals speed times time)
Δt = Δx/v (Time equals distance over speed)

9. Calculate speed of track
Example for track A:
Gravity and Kinetic Energy Course, 1.1: Speed Tracks
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10. Calculate speed of track
Example for track B:
Gravity and Kinetic Energy Course, 1.1: Speed Tracks
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11. Gravity and Kinetic Energy Course, 1.1: Speed Tracks
Use examples
If your car is going 50 kilometers in 2 hours, what is its average speed?
Gravity and Kinetic Energy Course, 1.1: Speed Tracks
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12. Method – Killer Whales Play Dodgeball
Mark the KEYWORD (Killer) – This is always a number and a unit, like 20 miles, or 5 kilometers, or 30 seconds, or 2 hours
WRITE the formula (Whales) – meaning v= Δx/Δ t
PLUG IN the numbers (Play) – Write in the numbers you found in the keywords
DO the Math (Dodgeball) Either using algebra or the magic pyramid

13. Different Floor Divide
Magic Pyramid
Distance (Δx)
Speed (v)
Time (Δt)
Same Floor Multiply
Different Floor Divide

14. If a truck goes 30 miles in 30 minutes, what is its average speed?
More Problems
If a truck goes 30 miles in 30 minutes, what is its average speed?
If you run 100 meters in 10 seconds, what is your average speed?

15. If you go 30 miles per hour for five hours, how far will you go?
DISTANCE PROBLEM
If you go 30 miles per hour for five hours, how far will you go?

16. TIME PROBLEM
If a plane travels at 400 miles per hour, how long will it take to fly 2400 miles?