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

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 Step 4

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

Develop speed equation Is there an equation we can use to calculate speed? Gravity and Kinetic Energy Course, 1.1: Speed Tracks Step 17

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 Step 17

Develop speed equation Teacher master B, Speed Equation Gravity and Kinetic Energy Course, 1.1: Speed Tracks Step 17

Speed equals Distance Over Time!

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)

Calculate speed of track Example for track A: Gravity and Kinetic Energy Course, 1.1: Speed Tracks Step 18

Calculate speed of track Example for track B: Gravity and Kinetic Energy Course, 1.1: Speed Tracks Step 18

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 Step 21

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

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

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?

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?

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