AT Cycle 31

🔴❗ 2: M 3/24, 🟡❗ 4: M 3/24, 🔵❗ 8: M 3/24 - induction assessment

Induction Exam TODAY!

Homework:  Prepare to quickly go through the next unit on more mechanics.  Feel free to work ahead.

🟥 2: W 3/26 lab, 🟨 4: T 3/25 lab, 🟦 8: T 3/25 lab - ↩️ Pivot air resistance 

Today, we will study velocity dependent forces with a lab in ↩️ Pivot Interactives called "Falling Coffee Filters."  We'll get back into the swing of mechanics by doing a lab where we investigate the concepts of air resistance (drag) and terminal velocity.  Some of you may elect to do an in-person version of the lab.  Others will choose to analyze videos in Vernier.  The choice is yours!  There are up-sides to each method and challenges to each.  In the end, no matter how you perform the lab, you'll see how drag force relates to velocity.  

For the in-person version, use the motion sensors we have in the classrooms to get data.  You will have to use Vernier Graphical Analysis which is available on ClassLink.  In ↩️ Pivot, do the parts that are labeled EVERYONE and PHYSICAL ONLY.

For the virtual video version, use the Vernier Video Physics web app which is accessible through ClassLink.  Instead of motion sensors, you'll track the motion of the filters in this app.  In ↩️ Pivot, do the parts that are labeled EVERYONE and VIDEO ONLY.

For both groups, you'll be graphing position vs. time and velocity vs. time in Vernier.  You'll see how the drag force (air resistance in this case) relates to terminal velocity.  Make sure to add rows in the data table to have 6-7 trials.  You're trying to answer the question:  if drag can be modeled as FD = -bv n, what are the values of b and n ?  Make sure you linearize your graph to find the relationship.

After completing the lab, your group will get together with another group to talk about the benefits and challenges to the in-person vs. virtual version of the lab.

By the end of this lab, you will be able to:

• Describe the force of air resistance.

• Describe the motion of an object falling in the presence of air resistance.  

• Describe how air resistance varies with velocity.

• Name some other variables that affect air resistance other than velocity.

• Name some real-life situations where air resistance is beneficial or detrimental.  

❤️ 2: Th 3/27, 💛 4: W 3/26, 💙 8: W 3/26 - ✏️ velocity dependent forces problems 

Today, first finish the lab if you have not yet already.  Then, you'll use what you've learned to try a few problems with velocity-dependent forces:

    Required:  1982M2, 1990M1, 2000M2