# AT Cycle 33

## 3/29 - 4/1

T 3/29

W 3/30

Th 3/31

F 4/1

### π΄β 1: T 3/29, π‘β 3: T 3/29 - induction assessment

Induction Exam on Tuesday, March 29th.

Homework: Take a breather before we dive into more mechanics. Be ready - we're gonna go fast! Feel free to work ahead.

### π₯ 1: Th 3/31 lab, π¨ 3: W 3/30 lab - β©οΈ Pivot air resistance

Today, we will study velocity dependent forces with a lab in β©οΈ 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. Otherwise, you'll be analyzing videos you take and graphing position vs. time and velocity vs. time in Vernier. In the end, no matter how you perform the lab, you'll see how drag force relates to velocity.

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.

Homework: Lab due in β©οΈ Pivot on Sunday, April 3rd at 10pm. Watch the following video on velocity dependent forces. At time 6:00, pause the video and practice solving the differential equation on your own. (It will probably be faster than watching the whole video.) After you make your best attempt, fast forward to see if you were right. Then, at 17:00, listen to the notes at the end. Be prepared for a daily quiz next class.

### β€οΈ 1: F 4/1, π 3: Th 3/31 - βοΈ 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.

Homework: Study for LAB QUIZ on Coffee Filter Lab next class (Monday). β©οΈ Coffee Filter Pivot due on Sunday, April 3rd at 10pm. Submit velocity dependent forces AP problems to βοΈ Google Classroom by Monday, April 4th at 10pm. Watch the following two videos - they're the same problem with two different methods which are both useful:

• Method 1: small mass dm, constant applied force, finite distance y

• Method 2: whole mass remaining, changing applied force, force constant for very small distance dx