TODAY…DAY 7

Review Kinematics, do an activity to apply and understand the ideas

Apply kinematics mathematically together

WHATS HAPPENING

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 atable asshown, and submit:

What is the correct value of time to be used here?

Variable Value

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) Vf2 = Vi2 + 2*a*d B) d = ½ (Vf + Vi)*t C) d = Vi*t + ½ a*t2 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!

ACTIVITY TO LEARN

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/s2, find how fast the car was initially going.

34.64m/s

LETS TRY SOME HW