Cornell Notes 7.1 What is Acceleration?

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Presentation transcript:

Cornell Notes 7.1 What is Acceleration? February 29, 2016 – Page 143

VIDEO! WRITE DOWN THE DATA!!!!!!!!

Answer these questions! What speed did the car begin at? What speed did the car finish at? How long did it take the car to speed up?

Acceleration The car went from 0 mph to 60 mph in 4.6 seconds So each second, it went about 13 mph faster! (I got that by dividing 60/4.6) Time (s) Speed (mph) 1 13 2 26 3 39 4 52 4.6 60

We say it has an acceleration of 13 mph/s (That’s miles per hour per second) Notice there are two pers because there are two times (hour and second) This just means that every second, I’m going 13 mph faster. If you increase by the same number of mph each second, that is a constant acceleration Does constant acceleration give you a linear SvT or non-linear? Does constant acceleration give you a linear PvT or non-linear?

Acceleration Acceleration means change in velocity What four things can you do to change velocity? (Look in your velocity notes if you have to) Speed Up! (Change Speed) Slow Down! (Change Speed) Stop! (Change Speed to 0 mph) Turn! (Change direction) If you have done ANY of these things, you have acceleration! The abbreviation for acceleration is a

Kinds of Acceleration When you speed up, we call that positive acceleration or just acceleration. (a is positive, like 3 mph/s) When you slow down or stop, we call that negative acceleration or deceleration (a is negative, like -5 mph/s) When you turn, that is angular acceleration – (in this class we won’t measure angular acceleration because you need a kind of advanced math called trigonometry to do it right.)

Accelerating with meters per second When you measure in ft/s, m/s, or cm/s, things get weird. Try saying 5 meters per second per second at fast as you can. Hard, isn’t it? To make it easier, scientists say meters per second squared (m/s2) It just means that every second, you go a number of m/s faster For example, if I start at 0 m/s and accelerate at 1 m/s2, then at 1 s, I’m going 1 m/s, at 2 s, I’m going 2 m/s, at 3 s, I’m going 3 m/s and so on…

Solving for Acceleration The formula for acceleration is… New Speed - Old Speed Time Example: I speed up from 5 m/s to 20 m/s in 3 seconds 20-5=15 m/s 15/3= 5 m/s2