AP Central (College Board Site) - AP Physics C Mechanics, AP Physics C E&MIf you need more support for physics basics, go to YouTube and search the topic with one of the following: Khan Academy, vkiledj, or Dan Fullerton (or APlusPhysics). Lesson objectives in Orange. |

### Advanced Topics in Physics

#### What must you consider in doing static equilibrium problems?

F 10/19Answers: Hard Torque Problems1. T3 = 250N, m = 40kg 2. T2 = 3700N, Fhy = 2350N down, Fhx = 1850N right 3. T2 = 600N, Fhx = 520N left, Fhy = 50N up 4. T1 = 289N, Fhx = 289N right, Fhy = 350N up 5. Fwall = 727N, Ff = 272N, Fground = 1230N 6. 51.3 degrees (there's a typo, it should say "minimum angle") Homework: Watch the video below. Might be review for some of you. |

#### How can you find the mass of a meterstick using torque?

W 10/17Today, we'll apply the concepts of torque and static equilibrium to find the mass of a meterstick. If you still need help here, watch the following video:Then, we'll work on some simple torque problems. Finish page 1 of the Torque Packet. Handout: Torque Meterstick LabHomework: Finish page 1 of the Torque Packet. Watch the following video on Torque Equilibrium Problems. Also, read the following webpage on Vector Multiplication. Remember that to calculate torque, we use a cross product. Review the right hand rule. |

#### What else do you remember about energy and projectile motion?

T 10/16 labToday, we'll start class by finishing the lab from last time. Then, we'll continue our review of last year with another lab which will review projectile motion. After we do the lab, we'll start the next unit of study. We'll also see a brief demonstration introducing torque.Homework: There are two videos to watch tonight (total is still under 20 min): |

#### How can we find the coefficient of kinetic friction with only a meter stick and a balance?

M 10/15Today, we'll continue review of last year's material by doing a lab. You'll need to find the coefficient of kinetic friction between a wooden block and the lab table. The only measurement devices are a meter stick and a balance. You cannot use any timing devices or motion sensors. You'll focus on work lost to a non-conservative force. If you finish early, you should try to find an expression for the coefficient using another method - Newton's Laws. Homework: Make sure your "lab write-up" is in your journal. It's not a formal write-up. Give it a title and make sure you have a labeled diagram of what you measured. Make sure to have some "before-and-after diagrams." Then just your measurements and calculations. |

#### How well do you remember energy and momentum?

Th 10/11I won't be in school today, so do the following problems from Chapters 8 and 9 to review energy and momentum problems from last year. If you haven't watched the videos from last night, do that first, and follow the steps for making a "before and after diagram" for every energy conservation problem. Required: Ch 8 - 19, 32, 79, Ch 9 - 13, 16, 24, 86, 104 Enrichment: Ch 8 - 23, 24, Ch 9 - 41, 96 Homework: Finish required problems above, and make sure you've watched the videos from last post. |

#### How well do you understand Archimedes' Principle?

W 10/10 (49 minute lab for PSAT)QUIZ Today on Archimedes' Principle!Homework: Watch below to review how to solve work/energy problems - Chapter 8 #27. The important thing in this video is to make sure that you understand how to make a "before & after energy diagram." This method of solving energy problems is not something that is universal amongst physics teachers, but I do think that it is helpful and virtually foolproof, so I would like to see you use it. In addition, you should be able to use the conservation of energy equation to solve energy problems. This method is different than the "Work-Energy Principle" method, so you might want to also look that up in your textbook (p. 165) and understand how it differs from the "conservation of energy" method. Both methods work, but given the situation, one usually works better than the other. Figure out why.pre-lab videoFor those of you who are curious, watch the video below about the dot product: |

#### How can you reason through buoyancy examples?

T 10/9Daily Quiz: Archimedes' Principle Demonstration (Predict) Today, we'll u se the concept of Archimedes' Principle to explain several phenomena. You'll work in pairs/threes and go around to several stations where you'll make predictions about what will happen in certain situations. Homework: QUIZ on Archimedes' Principle next class Wednesday, October 10th This is a real graded quiz, not a daily quiz. . |

#### How do you do problems using Archimedes' Principle?

F 10/5Daily Quiz: Archimedes Principle Demo Today, we'll finish working on practice problems from Chapter 13 to quantify Archimedes' Principle using a mathematical model:Required: 2005B5, 29, 32 Enrichment: 39, 41 Homework: Finish at least the required problems above. QUIZ on Archimedes' Principle Tuesday, October 9th This is a real graded quiz, not a daily quiz. Remember, lab due to Google Classroom Sunday, October 7th at 11:59pm..If you're interested, check out this video made by a fellow pirate: |

#### How can you find the density of a mystery liquid?

Th 10/4 labToday, we're going to take advantage of the double period and start a new lab. We need to find the density of an unknown liquid. Of course we can do that the traditional way with a graduated cylinder and a balance, but what if we have neither of those things? We'll use Archimedes' Principle and a few basic objects to calculate the unknown density. If you finish, we'll continue to work on practice problems from Chapter 13: Required: 2005B5, 29, 32 Enrichment: 39, 41 Homework: We're going to test your Penny Boats tomorrow, so make sure your design is complete and that you can construct your boat in a short period of time. Finish your Penny Boat Lab write-up which is due to Google Classroom by Sunday, October 7th at 11:59pm. Study for This is a real graded quiz, not a daily quiz! QUIZ on Archimedes' Principle Tuesday, October 9th. |

#### How can you solve problems with Archimedes' Principle?

W 10/3Today, we'll start with a brief daily quiz. We will use the first half of class to work collaboratively on the lab. Come up with a strategy for the solution. Work out any of the physics required together. Decide who will be in charge of what in the write-up and finish the majority of the write-up over the weekend. With any remaining time, you can start working on practice problems from Chapter 13 in order to practice using Archimedes' Principle:Required: 2005B5, 29, 32 Enrichment: 39, 41 Homework: Finish the great majority of your lab write-up. The only thing missing from your write-up should be the actual test where you say how many pennies your boat ACTUALLY held and what error might have been involved. All of your theory should be done and written up though. The final write-up will be due on Sunday, October 7th at 11:59pm and needs to be submitted through Google Classroom. Quiz on Archimedes' Principle TBD. |

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