AP PHYSICS DAY 34

Oh what a day planned!

1) We discuss the HW, finalize answers




2) You do a mini-quiz on ideas from the
homeworks
3) We finish the problems from the
previous day, and in doing so, become
more familiar with work and energy
4) We go back to the roller coaster,
where we finally get to finish our
sentances, diagram a LOL chart about
the situation, and do some solving of the situation.
5) If time…we learn about the idea of power.
SO…ANY QUESTIONS?
HW COLLECTION
Day 26/27 (packet)
 Day 28 (1st question is the Rocket Ship multiple
choice)
 Day 31 (Bar Graph Problem)
 Day 32 (The one out right now)

MINI QUIZ

20 minutes, 4 questions.

Can use formula sheet

Can use all notes and homework…after 10
minutes in. I will let you know.
LETS GO OVER IT PART ONE:
LETS GO OVER IT PART TWO:
WHAT IS GOING TO HAPPEN


We finish up the rest of the AP packets to get you
familiar with what is expected.
The next few days you will be demonstrating
these ideas with some mini-labs, weird theories,
and possible bodily harm.
ROLLERCOASTER…OF LOVE


(SAY WHAT?)
For each again, I want you to label them:
Top Thrill Dragster
AND
Rollback
Write a bit about the system energy from before
start to the end. Discuss how the energy changes
forms, where work is occurring ON the system
and BY the system.
Example of good sentence(s):
 Work was done on the coaster to speed it up,
giving it kinetic energy, while it was going up the
system lost some energy to its environment,
while the coaster did work by converting its
kinetic energy into stored potential through
gaining height.
 Then on the way down the coaster gained kinetic
energy from its stored potential, and at the
bottom the system gave all of its energy to the
environment causing it to slow to a stop.

NOW… THE DETAILS
Height of the coaster: 420 feet tall (130m)
 Accelerated to a speed of 120 mph (190 km/h) in
3.8 seconds and then begins to vertically climb.
 17 seconds for the ride
 18 riders per train, train mass is 15 tons
(13,600kg) empty.

POINTS OF ENERGY



Dark Blue:
Launch point. Energy
given to cart from
hydraulics. 100% is
Kinetic Energy
Red: ½ way up: 45% of system energy is K, 45% is
Gravitational Potential. 10% is ‘dissipated’
Green: Top. 75% is Gravitational Potential. 25%
dissipated.
POINTS OF ENERGY



Light Blue: ½ way down
30% K, 30% Ug.
40% dissipated.
Pink: 100% dissipated.
We are going to create bar graphs for the
energies at these points.

Question to answer: Can the roller coaster go
over a hill that is just a bit more than 200m tall?

Is the work done by gravity ever positive for this
coaster? (If no, explain. If yes, describe where)

From B to C, is the net work positive or negative?
Explain why.

At A, what forms is the system/total energy in?
Find the amount of the forms, and thus the total
energy of the system.

At B, is the total amount of system energy the
same as A? Lets find the forms and amounts of
each.
AP PHYSICS DAY 34

Oh what a day planned!

1) We discuss the HW, finalize answers




2) You do a mini-quiz on ideas from the
homeworks
3) We finish the problems from the
previous day, and in doing so, become
more familiar with work and energy
4) We go back to the roller coaster,
where we finally get to finish our
sentances, diagram a LOL chart about
the situation, and do some solving of the situation.
5) If time…we learn about the idea of power.