DAY 74
#Goals: SWBAT...
1. Pass the CH 9 Exam :-)
2, Define Work,
WARM-UP:
1. You have some review time today that you can use to go over a problem, get a calculator (there are 18 - Chloe, please count them before the end of the period to make sure they're all present). The test should take you 30-60 minutes. Turn it in to the Period 7 slot when you're done, then work quietly on your classwork. Keeping quiet shows respect for your fellow classmates who are still taking the test, and aren't quite a fast as you...
You'll begin the test at 12:30.
You are allowed:
calculator (no phone calculators, no sharing of calculators)
1-pg notes sheet - single side only (or 1/2 page double sided)
your equation sheet
CLASSWORK:
1. CH 9 Test today :-) Begin at 12:30. See rules above
2. New Topic: Work and Energy
1. We are covering Work and Energy next (CH 10).
2. Watch this! --> http://www.flippingphysics.com/work-intro.html
3. Complete the following:
A. What are the three most important learning concepts you saw/heard/learned from this video?
B. When Billy is holding the dictionary, is he doing work? Why or why not?
C. Are there any misconceptions pointed out in this video that you/your classmates might be confused by?
D. Define 'work'. What is the symbol? units? equation?
E: What is negative work?
F. The end is weird. I know.... Sorry.
G: There are some lecture notes here: http://www.flippingphysics.com/uploads/2/1/1/0/21103672/0134_lecture_notes_-_introduction_to_work_with_examples.pdf
HOMEWORK:
I'll be checking your classwork on Tuesday for credit, so if you didn't finish in class, it's homework now... :-)
In addition, you'll have a reading quiz Tuesday on work, kinetic energy, and how they're calculated. Read pg 257-260 to prepare
Need extra credit? Make a Kahoot question with four multiple choice answers on the reading, and email it to me at j.alexander@tch.birminghamcharter.com by Monday night at 11:59pm.
#Goals: SWBAT...
1. ... review the components of "Power"
2. ... solve advanced work and power problems
3. ... create and share graphs showing power output of a person climbing stairs
WARM-UP: pg 265: 15-18
Complete the following:
1. How many Joules in a kJ?
2. A forklift raises a box 1.5m and does 9.0kJ of work on it. What is the mass of the box?
a. Sketch the situation showing the forklift with initial conditions.
b. Establish a coordinate system with up as positive.
c. Draw a vector diagram for the force and displacement.
d. Solve for Mass
CLASSWORK:
1. Lab Requirements:
Typed.
Introduction (answer the main question by presenting your hypothesis)
Data (data table and graphs go here)
Analysis Section
- will be completed in parts. Each group member will answer one to four questions. Those will be turned in on the due date (Friday 04/29), and will be the sole responsibility of the group member to which they are assigned.
Conclusion (was your hypothesis correct? Why or why not?)
2. Power Lab Analysis
TASKS:
Divide the "Conclude", "Apply/Going Further", and "Real World Physics" questions so each member has a fair amount.
Type the answers your your questions. Be sure to either copy the question, or paraphrase it in your answer.
Make sure to write your name next to each problem you solve.
Mid-period check:
- Have you shared or emailed the data table and graphs to all group members?
HOMEWORK:
Period 7: your lab is due at the beginning of the period Friday.
Period 8: your data is due at the beginning of the period Friday.
1. Watch: http://www.flippingphysics.com/intro-ke.html
2. Is KE a vector or scalar? Can it be negative?
3. As you watch the video, take note and copy the solution for the example problem.
4. Why do we only need the speed (and not the velocity) of the bike or car to solve the problem?
5. What mistake was (almost) made at around 3:30 of the video?
6. Solve a similar problem: Pedro is skateboarding at 4m/s. He has a mass of 55kg, and his skateboard has a mass of 3.0kg. His buddy Napoleon has a mass of 85kg. How fast must Napoleon run to have the same KE as Pedro?
NOTE: I received an excellent question about the lab, which I answered, and thought would be good to share with everyone:
Hi Joe Sixpack,
If you search for the following keywords: wattage common household appliances
you'll get some solid results. Here's one good one: https://www.consumerreports.org/cro/resources/images/video/wattage_calculator/wattage_calclulator.html
Let me know if you have any other questions :-)
Best,
Mr. A
From: Joe Sixpack
Sent: Wednesday, April 27, 2016 8:05 PM
To: Joshua Alexander
Subject: Help
Mr.Alexander,
I need help on number one, on Real-World Physics. I just need help understanding what is it saying. A household item like a remote control or something else?
Thanks,
Joe Sixpack
P.7