TODAY…DAY 7 Review Kinematics, do an activity to apply and understand the ideas Apply kinematics mathematically together.

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Presentation transcript:

TODAY…DAY 7 Review Kinematics, do an activity to apply and understand the ideas Apply kinematics mathematically together

W HATS H APPENING Day 5 HW: Any questions?

NEXT CLASS: HW Turn in: Day 5 HW Day 7 HW Quiz corrections

VOTING: A panda starts off running at a constant 12m/s for 6 seconds. It then slows down and stops over the next 4 seconds. What acceleration did it have? Fill out a table as shown, and submit: What is the correct value of time to be used here? VariableValue

VOTING: A panda starts off running at a constant 12m/s for 6 seconds. It then slows down and stops over the next 4 seconds. What acceleration did it have? What would be the correct equation to use here? A) Vf 2 = Vi 2 + 2*a*d B) d = ½ (Vf + Vi)*t C) d = Vi*t + ½ a*t 2 D) Vf = Vi + a*t

VOTING: A panda starts off running at a constant 12m/s for 6 seconds. It then slows down and stops over the next 4 seconds. What acceleration did it have? Submit the answer for this:

VOTING A panda starts off running at a constant 12m/s for 6 seconds. It then slows down and stops over the next 4 seconds. How far did it travel overall? A) Use a total time of 10 seconds, with Vi being 12 and Vf being 0. Get d B) Find d with t being 6, Vi being 12 and a is 0. Then find d with t being 4, Vi being 12 and Vf is 0. Add both d’s for the total C) Use t as 4, Vi as 12, Vf as 0. Get d.

VOTING A panda starts off running at a constant 12m/s for 6 seconds. It then slows down and stops over the next 4 seconds. How far did it travel overall? Get a number!

A CTIVITY TO L EARN Not turned in, but can be assessed. Goal: To understand the relationships and how they apply.

LETS TRY ONE Using the elegance of nature. A cat jumps up at 2m/s off a 30m tall building. A) Draw a numberline with all relevant information in the picture. Vi = +2m/s At bottom, d = - 30m

LETS TRY ONE A cat jumps up at 2m/s off a 30m tall building. B) How fast was it moving when it hit the ground? Vi = +2m/s V = ?

LETS TRY ONE A cat jumps up at 2m/s off a 30m tall building. C) How long did it take to hit? Vi = +2m/s t to this point

TO THE BOARDS If the police find skid marks 60 meters long at a crash site (car came to a stop), and know that dry pavement usually allows for acceleration of -10m/s 2, find how fast the car was initially going m/s

LETS TRY SOME HW