Inclined Plane Lab

Today you completed a small lab to find if the angle of an inclined plane affects its efficiency as a machine:

You also have some homework, due Wednesday: p.162 #47 & 89

Machines

Today we very briefly talked about machines and efficiency.

Notes: Machines

Your homework is a little half sheet called HW: Machines. I checked your Energy of a Bouncing Ball Lab while you started that homework.

On Monday/Tuesday nest week you will be completing a lab. The goal is to find the frictional force on a cart rolling up/down a ramp, plus find the efficiency of said ramp. How you do these two things is up to you, so start thinking about it over the weekend.

Power

Notes: Power!

Here is the solution to the last example problem:

Homework: p. 162 #45, 50 (use Watts instead of horsepower), 56 

Lab: Energy of a Bouncing Ball + Work Due to Friction Problem

Today we first completed a 20 minute, multiple choice quiz over first quarter content. Then we did a problem together (see below) and finally worked on the lab Energy of a Bouncing Ball.

Your homework tonight is to finish your lab and also complete Energy TIPERs #5 (email miss.volkening@gmail.com for a copy), due THURSDAY. Warning: Energy TIPERs #5 is not easy, but we do have a little time on Thursday for help, so please do not stay up all night stressing about it. You have the PSAT on Wednesday; please focus on preparing and resting for that.

Here is the problem solved with numbers:

And again without numbers first:

Work Due to a Variable Force

Today we found the work due to a variable force with graphs and used that to find velocity at a given position.

Notes: Work Due to a Variable Force (remember to download and run as a slideshow)

We practiced in class with Energy TIPERs #4 (email miss.volkening@gmail.com for a copy). This was NOT turned in for a grade.

Homework tonight is Chapter 5 (p. 163) #59, 60, 61

Work

What is work? This is not a philosophical question.

Notes: Work

We worked on Energy TIPERs #3 in class today, which you kept as notes.

Homework is p. 158 #8, 9, 13, 16

Energy Conservation Practice

First we went over Energy TIPERs #2 and #37 from yesterday's homework:

We spent the rest of the period practicing more problems. If you didn't finish in class, these are homework:


Energy Conservation Practice (email miss.volkening@gmail.com for a copy)
p. 160 #32 & 38

Mechanical Energy

Today we started talking about mechanical energy and its conservation:

Notes (remember to run as a slide show!)


This left about 10-15 minutes left in the period, but hopefully you used it to start your homework:

• Energy TIPERs #1 (email miss.volkening@gmail.com for a copy)
• Energy TIPERs #2 (email miss.volkening@gmail.com for a copy)
• Ch.5 (p.160) Problems #25 & 33. Try #37 but it won't be the one graded.

Forces Practice Test

Today we first used Plickers to do about five review questions together. The rest of the day, plus Wednesday, will have unstructured work time to prepare for the Forces Test on Thursday. You are getting extra time for this test because I don't want to start a new unit before fall break and I also because I presume you will have tests/quizzes/projects in many of your classes this week.

I did put out Friction TIPERs #4, but you will not be turning this in. It's an optional extension activity that you can check with me or check on your own using the key in the key binder at the back of the room.

So, here is your practice test:

Forces Practice Test (this file repeats the problems twice for printing purposes)

Below are some videos I made a few years ago. They might help you with some of the problems, but keep in mind that these might not perfectly match your practice test and the grading will probably NOT be the same.

#1
This one is like #2, though it is solving for something else 
#3
#4

Also, the key: