Honors: Forces Study Guide

Today is your day to work on the study guide for our second test. We also counted stamps today. Next class you will have about 45 minutes to last minute studying, and the last hour will be your test.

Period 4, I have to proctor AIMS on Wednesday, so make sure you email me any questions Tuesday as you will not see me Wednesday. miss.volkening@gmail.com

Study Guide: Forces
Answers:

Honors: Tides

Today we talked about tides and black holes. If you missed the notes, the Wikipedia acticle on tides is quite good. For our class, we care about what causes the basic tides, spring tides, and neap tides. You will not be held responsible for all the details in the Wikipeida article...although the whole subject is quite fascinating.

I also found a pretty good video that explains the tides well. You can view it here.

Here is a video we watched of the very dramatic tides in the Bay Of Fundy.

Homework: Tides

Honors: Law of Universal Gravitation

Homework tonight is Universal Gravitation.

Conceptual: Forces Study Guide

Here is your study guide for your second test: Forces Study Guide. Your test is Friday.

Honors: Finding g With Centripetal Force

Today we used centripetal force to verify the acceleration of gravity near Earth's surface. The bellwork is below. Here is the lab.

Conceptual: Law of Universal Gravitation and Tides

Today we talked the Law of Universal Gravitation:

And we practiced a bit with Universal Gravitation.

Then we went over some consequences of the fact that gravity is weaker at larger distances: tides and black holes. If you missed the notes, the Wikipedia acticlte on tides is quite good. For our class, we care about what causes the basic tides, spring tides, and neap tides. You will not be held responsible for all the details in the Wikipedia article...although the whole subject is quite fascinating. 

Here is a video we watched of the very dramatic tides in the Bay Of Fundy.

Here is a video of the amazing Neil DeGrasse Tyson explaining black holes. My pictures are backwards from his explanation - I drew a person diving in, while he talks about a person going in feet first.

Homework: Tides

Honors: Momentum/Rotational Motion/Gravity Study Guide

I was going to try to squeeze in a lab before the next unit...but then almost no one turned in Momentum III and those that did left most of it blank. I also found out that I'll be gone on Friday and I didn't want you doing a lab while I'm gone. So today (and tomorrow and Friday) are going to be work days. In addition to completing Momentum III like you were supposed to, you can work on the study guide for our second test, which will be Monday.

Study Guide

Honors: Tides

Today we talked about tides and black holes. If you missed the notes, the Wikipedia acticle on tides is quite good. For our class, we care about what causes the basic tides, spring tides, and neap tides. You will not be held responsible for all the details in the Wikipeida article...although the whole subject is quite fascinating. 

Here is a video we watched of the very dramatic tides in the Bay Of Fundy.

Here is a video of the amazing Neil DeGrasse Tyson explaining black holes. My pictures are backwards from his explanation - I drew a person diving in, while he talks about a person going in feet first.

Homework: Tides

Honors: Orbits

Today we talked about why astronauts seem to be floating when in orbit even though they are not "weightless." We also derived an equation for the mass of a body that is being orbited.

Honors: Law of Universal Gravitation

Today we sort of derived the Law of Universal Gravitation. Later we'll play with the math of orbits with this equation, but for today your homework is conceptual: Universal Gravitation I.

Conceptual: Study Guide 8 Answers

Here are the abridged answers for the study guide posted yesterday. We also counted stamps.

Conceptual: Microgravity and Unit 8 Study Guide

Today we very briefly talked about why astronauts orbiting earth seem to be "weightless" but are not. The rest of the time was used to start on your study guide (I'll post the answers tomorrow). We'll be counting stamps tomorrow and your test is on Friday.

Conceptual: Tides

Today we talked about tides and black holes. If you missed the notes, the Wikipedia acticle on tides is quite good. For our class, we care about what causes the basic tides, spring tides, and neap tides. You will not be held responsible for all the details in the Wikipeida article...although the whole subject is quite fascinating.

Here is a video we watched of the very dramatic tides in the Bay Of Fundy.

Homework: Tides

Conceptual: Law of Universal Gravitation

Every mass pulls on every other mass in the universe.
Homework: Universal Gravitation.

Unit 8 Study Guide

Today is your one and only work day to get ready for your Unit 8 Test. Your study guides are below. You also need to count and record your bellwork stamps.

Unit 8 Study Guide
Honors Unit 8 Study Guide

Aaaaaand here's an extra credit assignment, open to everyone:

Extra Credit: Universal Gravitation II

Test Tomorrow!

Orbits and Microgravity

Due to the unusually cold weather, Desert View started late this morning. Therefore periods are only 35 minutes each, so I am postponing our discussion of tides and black holes and instead we are discussing why astronauts seem to be "weightless" when in orbit.

Also, homework! For everyone: HW: Unit 8 Practice

Additional for Honors: HW: Banked Curves
And a totally awesome online tutorial to help you with that homework can be found here.

The Law of Universal Gravitation

Homework tonight: Law of Universal Gravitation

Unit 8 Review: Circular Motion, Gravity, and Friction

Please turn in HW: Friction and count your stamps from the last two units. Below are the review problems for the Unit 8 test, which is on Thursday.

A ladybug sits halfway between the axis and the edge of a turntable. What happens to its linear speed if:

a. The RPM rate is doubled?
b. it sits on the edge of the turntable?
c. Both a and b happen?

What path would you follow if you fell off the edge of a rotating merry-go-round?

The faster the earth spins, the less a person weighs; whereas the faster a space station spins, the more a person weighs. Explain.

If the gravitational forces of the sun on the planets suddenly disappeared, in what kind of paths would they move? Be specific!

If the moon were twice as massive, would the attractive force between the earth and the moon be twice as large? Between the moon and the earth?

If you stood atop a ladder that was so tall that you were twice as far from the earth's center as you are now, how would your weight compare to its present value?

The planet Jupiter is more than 300 times as massive as Earth, so it might seem that an oject on the surface of Jupiter (if it had a surface) would weigh 300 times as much as on Earth. But it so happens that an object would scarcely weigh three times as much on the surface of Jupiter as it would on the surface of the earth. Can you come up with an explanation? (Hint: Let the terms in the equation for gravitational force guide your thinking.)

What is the cause of friction, and in what direction does it act with respect to the motion of a sliding object?

If the force of friction accting on a sliding crate is 100N, how much force must be applied to maintain a constant velocity? What will be the net force acting on the crate? What will be the acceleration?

What is the mass and what is the weight of a 10 kg object on the earth? What is its mass and weight on the moon, where the acceleration of gravity is 1/6 that of the earth?

Tides

If you missed the notes, the Wikipedia acticle on tides is quite good. For our class, we care about what causes the basic tides, spring tides, and neap tides. You will not be held responsible for all the details in the Wikipeida article...although the whole subject is quite fascinating.

Homework: In your own words, explain the origin of the ocean tides. Be specific and thorough!

Extra credit: There are 2 tide cycles per day and 24 hours in a day. Then why is the average period of one tide cycle 12.5 hours instead of 12 hours?

What would happen if you fell into a black hole?

Today we talked bout what would happen if you fell into a black hole. Here is a great explanation by Dr. Neil deGrasse Tyson.

Homework: Is going into a black hole a good idea? Use the Law of Universal Gravitation, but explain in your own words. NOTE: Approach this homework like an English assignment. Part of your grade will depend on the Six Traits of Writing.

Don't forget to turn in last night's homework!