AT Cycle 7

10/15-10/20

F 10/15

M 10/18

T 10/19

W 10/20

πŸ”΄ 1: F 10/15, 🟑 3: F 10/15 - static equilibrium problems

Daily check-in: basic torque and static equilibrium

Today, we'll try the Hard Torque Problems for practice with static equilibrium. We will continue working on these next hour as well.

Answers: Hard Torque Problems
1. 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 = 727N, Fground = 1230N
6. 51.3 degrees (there's a typo, it should say "minimum angle")

Homework: Work on completing Hard Torque Problems due to ✏️ Google Classroom by Tuesday, October 19th at 10pm. Watch the video below before class on Friday, October 22nd. Might be review for some of you. If this is new to you, perhaps consider watching this video multiple times before next week. QUIZ on static equilibrium problems on Thursday, October 21st

πŸŸ₯ 1: T 10/19 lab, 🟨 3: M 10/18 lab - ladder lab (1)

Daily Check-in: Line of action method

Today, we'll start class by going over the line of action method of solving problems. We'll finish up the Hard Torque Problems from last lesson.

Then, during the second hour of lab, we'll investigate the situation of a ladder leaning against a wall. We'll start with a short video about ladder safety. We'll use this to generate some questions about ladder safety. We'll use what we know about static equilibrium to figure out where we can stand on a ladder and feel safe. You will work as collaborative team members to build a couple different models of the situation and make predictions about safety. Then, we'll test your Ladder Lab models with a few questions. You'll go through the iterative process of engineering your ladder model to correct any weaknesses. You'll answer a few more questions to make sure your model works well. Finally, you'll answer the ultimate question about the real-life safety of ladders by researching some specifications of real ladders and you'll consider some design choices that could make the ladder safer.

Lab Safety: During our ladder lab, we will be leaning a model of a ladder up against a wall and sometimes hanging masses off the ladder. The ladder may be in a precarious position, so please make sure not to place your hand under the ladder, as the ladder could slide and fall on your hand or fingers. Also, since you are using masses, be careful that the masses do not fall off the table as that could cause injury if they land on someone. Don't attempt to climb a ladder at home without supervision.

Handout: Ladder Lab

Homework: Finish creating your mathematical models on page 1 of Ladder Lab if you have not already done so. We can test your models next time. Make sure you've completed Hard Torque Problems due to ✏️ Google Classroom by Tuesday, October 19th at 10pm.

Ladder Lab.pdf

❀️ 1: W 10/20, πŸ’› 3: T 10/19 - ladder lab (2)

We'll test and evaluate your ladder models. Do you think this is a good strategy to ensure safety?

Lab Safety: During our ladder lab, we will be leaning a model of a ladder up against a wall and sometimes hanging masses off the ladder. The ladder may be in a precarious position, so please make sure not to place your hand under the ladder, as the ladder could slide and fall on your hand or fingers. Also, since you are using masses, be careful that the masses do not fall off the table as that could cause injury if they land on someone. Don't attempt to climb a ladder at home without supervision.

Homework: Finish the Ladder Lab due in class next time (Thursday).

Study for QUIZ on static equilibrium problems next class - Thursday, October 21st.

Watch the following videos: