Ch.4 Additional Problems

More practice! We used class time today to work on more chapter 4 problems as well as making up some labs and such. Remember, end of quarter is Thursday!

Homework: Chapter 4 #69, 75, 78, 81

Friction Practice

Today we simply practiced problems involving friction. First we worked on the weekend's homework, then we started on tonight's homework.

I also checked your labs from Friday and talked about available extra credit. Remember that you must have everything turned in to be eligible for extra credit.

Homework tonight: Ch.4 # 47, 50, 57, 67

Static Friction Lab

First, some bellwork:


Then we completed the Static Friction Lab. If you missed class today you can do this lab at home with any rigid object that you can tip up (hardcover book, for example), a second object sitting on top of it, and a way to measure the angle of incline (protractor or ruler + trig).

Homework for the weekend is Ch. 4 CONCEPTUAL #4  and PROBLEMS #39, 41, 51

More on Friction!

Today we went more in depth with friction and practiced some friction problems.

Friction Problems

Homework is to finish any worksheets you didn't finish in class. There were three total.

Friction Intro

Today we are starting the topic of friction. This seems to be about how far we're getting today:

There is no homework.

Equilibrium Lab

Today you used force tables to explore equilibrium with the Equilibrium Lab. This lab is really meant to solidify our understanding of net force, so we're not doing anything truly new. The lab was done in your lab notebooks and your grade is based on participation, so there is nothing to turn in.

I also checked off your Newton's 2nd Law lab from last week since you already had your notebooks out.

Homework is Chapter 4 # 17, 20, 31

Ch.3 Test Overview

For today's shortened classes we got the chapter 3 tests back and went over them. If you got less than 80% you can retake it next week, but the maximum score you can get on the retake is 80%.

Homework tonight is Ch.4 #29 & 32

Inclined Planes

Today we continued looking at examples of Newton's Second Law problems - specifically, how do you deal with an inclined plane?

EDIT: Because of the epic fire alarm evacuation during 1st period, I will be posting videos of the inclined plane lecture and some homework problems. Check back here tonight for those videos.

Lecture: a block on a frictionless inclined plane (note that I made this for another class about a year ago so it may reference things that didn't happen to you).
Chapter 4 #27 (homework tonight)

Homework is Ch.4 #27 & 28

Solving Newton's 2nd Law Problems

Today we are practicing problems that use Newton's Second Law. I led you through one problem to show you the process, then we worked on steadily more complex problems to practice the process.

Solving Newton's Second Law Problems

I managed to remember to take a picture of the board after the example problem about the bird on the telephone line.

Homework: Ch.4 #19, 21, 25, 38

Newton's Second Law Lab

Sorry that I am out again on a modular day. This is the second of three all-day trainings I must attend, so only one more after this! I wanted to you to do a lab today, but without me there I was concerned about doing anything too complicated or dangerous, so unfortunately the lab is a "cookbook" type. I am not trying to insult you by giving such explicit instructions, honest!

Newton's Second Law Lab

Note that you are doing this entirely in your notebook and I will simply check it off later. You will not actually be turning anything in.

Homework tonight is Ch. 4, Problems 3, 10, 13, 16

Newton's Third Law

Today we first worked on some ranking tasks to practice Newton's Second Law. Then we talked about the Third (and last) Law:

Newton's Third Law

Homework is #7-10 on the Forces Non-Textbook Problems worksheet.

Newton's Second Law

Today we talked about free body diagrams, finding net force, Newton's Second Law, and weight. Notes are here:

Newton's Second Law

We also did a practice worksheet in class in which you found the net force from free body diagrams.

Homework tonight is #4-6 on the Force Non-Textbook Problems and Ch.4 Problem #2 out of the textbook.

Newton's First Law

Today we talked about Newton's First Law. There really isn't a whole lot to say, so the Powerpoint basically has a bellwork and states Newton's First Law:

An object at rest stays at rest and an object in motion stays in motion in a straight line unless acted upon by a net force.

There aren't any good problems in the book that deal with this, so I made some and handed them out:

Forces Non-Textbook Problems

Most of our homework this week will come from that paper. Tonight's homework is # 1 - 3.

Key Club Findraiser

Hello all. The UHS Key Club is holding a fundraiser to help fight ebola. When at least $10 is pledged toward a teacher, that teacher gets a pie in the face. I volunteered so if you want to see me get a pie in the face, go here:

https://fundly.com/uhs-key-club-help-fight-ebola

Chapter 3 Test and Forces Intro

Today we took the chapter 3 test for the first 75 minutes of the period. Later we started our new unit with an extremely short intro to forces:

Forces

No homework tonight.

Chapter 3 Review: Practice Test

Today we went over the practice test to review for your test first thing next week. Last time we did this I developed severe pain in my right shoulder from writing on the board all day (with arm straight up since I'm so short), so this time I made videos and showed those instead. We then answered specific questions when necessary.

Remember, points are given for showing your work as well as the final answer, so make sure to:

• show your equation BEFORE substituting numbers
• explicitly show what numbers are substituted where (including zeros)
• use proper units on answers

Here are the videos for the practice test free response problems:

#1: Find the time it takes a stone to reach the ground when it is thrown horizontally off a tower.

#2: Find the magnitude and direction of a vector given its components.

#3: Find maximum height and range of a projectile fired over flat ground.

#4: Find the range and final velocity of a diver.

#5: Find the velocity with which a ball rolls off a counter top given height of counter and range of ball.

#6: A centerfielder runs to catch a pop fly

In case you need it, you can download the practice test here.

Ch.3 Practice Exam

Today you had time to work on the Chapter 3 practice exam. Tomorrow we will go over it and your real test is first thing next week.

Ch.3 Additional Problems

First we went over one of last night's homework problems (class's choice), then we spent some time working on tonight's homework in pairs or groups so I could finish checking labs and helping individuals.

We will be having review activities for the rest of the week with a test first thing next week.

HW: Ch.3 #48, 52, 53, 57

General Relativity

Today we went over some of last night's homework and then talked about relative motion. There aren't really any notes except a little that made it onto the whiteboard:

And we ranked these pictures from greatest velocity of the person relative to the ground to least velocity of the person relative to the ground. The answer is on the left side of the board above.

Please remember that tomorrow before and after school is the last chance for test retakes. We are looking at another test next week.

Homework: Ch.3 #35d, 37, 40, 41