Embedded Files
Th 11/14
F 11/15
M 11/18
T 11/19
🟢 5: Th 11/14 - pulley problems
🟢 5: Th 11/14 - pulley problems
We'll start by looking at a modified Atwood machine with friction and then learn about an Atwood machine.
In order to reinforce the problem-solving techniques for multiple objects in a system, we'll work on Chapter 5 📖textbook problems from section 5.5: #(42), 44, (46), (79), 82, 84.
Presentation: Ms. Kukon's Newton's 3rd Law & 2-Block Systems
Mrs. Fortunato's Review Presentation: Two Block Systems
Optional Extra Practice: Advanced Forces CompuSheet (Solutions), #1-2 in Table Top Pulley Problems (Solutions #1-2).
Homework: Quiz on pulley problems next class - Monday, November 18th!
Videos: If you're looking for some assistance understanding pulley problems, you can check out the two videos below. They do not include thinking about the system as a whole, but looking at each of the blocks separately will give you the same result.
🟩❗ 5: M 11/18 - vectors at angles
🟩❗ 5: M 11/18 - vectors at angles
Quiz on pulley problems TODAY!
Today, we'll learn about vectors that are at angles. We'll see how to add two vectors that are perpendicular to get a diagonal "resultant" vector. We'll learn to resolve diagonal vectors in x- and y-components using trigonometry (SOH CAH TOA). Finally, we'll begin to explore how we can use Newton's 2nd Law with diagonal vectors.
Presentation: Ms. Kukon's Vectors in 2-D Presentation
Homework: If you'd like to review more on vector addition, you can watch these videos:
💚 5: T 11/19 - 📓 static equilibrium lab
💚 5: T 11/19 - 📓 static equilibrium lab
Today, we'll look at "static equilibrium" problems - where the forces are balanced. We approach static equilibrium problems by making ΣFx=0 and ΣFy=0, but some of the forces will be at angles.
We'll start by learning about a problem that rock climbers encounter when building an anchor. We'll learn the physics theory and engineering behind climbing safety. In order to fully understand the problem, we'll look at how Newton's Second Law acts in two dimensions with a physical model of the situation. We'll investigate how the angles at which the slings hang can impact the amount of force they experience and can support. We'll perform a lab where we try to find the mass of a mystery object using two dimensional forces.
You will set up three asymmetrical situation with the Y-tension string. Assume the string is ideal (massless and inelastic). Use a protractor to measure the angle of each string with the horizontal. Use the spring scales to measure the tension in each string.
In your lab notebook, draw a free body diagrams of the knot. Record the two angles and two tensions for the situation at your lab table. Calculate the mass of the mystery object. Mass the mystery object on the digital balance, and do a percent error calculation.
If you have any trouble understanding the calculations for the lab, check out the following video. The strategy is to draw a free body diagram of the knot. (If the knot is made out of ideal or massless string, it does not have a force of gravity on it.)
Homework: If you'd like to get ahead, check out the 📖 textbook problems in the next post. Quiz on static equilibrium & 2-D vector forces on Friday, November 22nd.
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