Dallin S. DurfeeFall 2013

Physics 123 section 1

Welcome to Physics 123

Are you in the right section? Are you prepared for this class?

If you buy my book, you’ll find out how to get rich on free government money.

You can cure cancer with belly button lint.

Physics 121 is not a prerequisite for Physics 123

Why are you here?

Is it harder or easier to get a testimony if you don’t live the word of wisdom?

The Syllabus and Schedule

Karate

http://karate.sqcomic.com/ Nunchaku

The book situation . . .

"I thought I was a good teacher until I discovered my students were just memorizing information rather than learning to understand the material. " 

--Eric Mazur

. . . those students who study outside of class in small groups of four to six students, even just once a week, benefit enormously. Group meetings are organized around discussions of the homework, and as a result of their study group discussion, students are far more engaged and better prepared for class, learning significantly more.

. . . the single best predictor of success in college . . . the ability of a student to either create a study group or join a study group. 

Get to know your neighbor

Ideas– Why are they taking this class?– What’s something interesting about

them?– What is their family like?

Study Groups Sit with your group every day When a discussion question is given,

discuss it with your group and decide on the best answer. Then enter your answer with your individual clicker.

If you do not understand something in class please quietly talk to your group about it—Talking in class is encouraged if the discussion helps you to better understand what I am presenting. But please don’t distract others.

Let the physics begin!

Pressure!

Units

A 150 lb woman in high heels and 150 lb man in flat shoes are standing on the sidewalk.

a. The man puts more force on the ground.

b. The woman puts more force on the ground.

c. The man exerts the same force on the ground as the woman.

A 150 lb woman in high heels and 150 lb man in flat shoes are standing on the sidewalk. Who exerts more pressure on the ground?

a. The man

b. The woman

c. They exert the same pressure

Who will win?

a) Dr. Durfee

b) Dr. Durfee’s victim

c) The one who pushes harder.

d) The one who weighs the most.

Push a war

A container is filled with oil and fitted on both ends with pistons. The area of the left piston is 10 mm2; that of the right piston 10,000 mm2. What force must be exerted on the left piston to keep the 10,000-N car on the right at the same height?

1. 10 N2. 100 N3. 10,000 N4. 106 N5. 108 N

What are your options

Twelve years in prison for bank robbery …

Atmospheric pressure: 14.7 lbs/in2= 1.01x105N/m2

Pressure depends on the weight of the stuff above

Atmospheric pressure: 14.7 lbs/in2= 1.01x105N/m2

Pressure depends on the weight of the stuff above

r = 6371 km