DAY 22

Good morning students. Anything written in bold font is to go in your notes for today, and to be uploaded to the Google Classroom via photo by the end of the day.

Have a productive day :-)

Mr. Alexander

The goals today are two-fold:

1st is for you to get to a mastery level understanding for how to break a vector into x and y components, and for you to be able to comfortably solve projectile motion problems where the projectile is moving with an initial horizontal velocity (no vertical component). We will work towards this goal with some review of Day 21, a practice problem, and a game appropriately titled, "Turd the Target" (you can thank Mrs. Lovegren and Mrs. Herring - they found it :-) ).
2nd is for you to show understanding of how to solve problems in which the projectile is launched with both vertical and horizontal components. We will work towards this goal via a simulation, a few practice problems, and a Flipping Physics video.

WARM-UP (10 min - don't wait to start this, you'll run out of time. Begin at 8:30, and work thru roll call/announcements, end at 8:40)

On page 164 of CH 6, solve problems 33, 34, & 35.

Answers are here: LINK

CLASSWORK

1. (10min - end at 8:50) Title your notes: 2-Dimensional Projectile Motion

Copy section 6.1 study guide from pg 163 into your notes

What does it all mean? Video Notes: LINK

Read pg 147-149, and answer the following questions in your notes.

A. Define "trajectory"

B. What are the forces on the softball after it leaves the throwers hand?

C. Does the horizontal motion of a projectile affect its vertical motion?

2. (10 min - end at 9:00) HW Review:

Note that for our last class, Day 21, there are links on the Day 21 page to videos explaining how to solve both CW problem sets.

If necessary, briefly review them, then continue with today's lesson.

For this review, we will look at the two projectile simulator activities: LINK - Activity #1 LINK - Activity #2

3. (15 min - 5min/problem - set a timer! and end @9:15) 2-Dimensional Projectile Motion Practice Problems

From pg 150, solve Problem #1 along with me (Video --> LINK). This is similar to the pool ball problem you did last class. Use your

notes :-)

Then solve #2 and #3 on your own

Check your results here: LINK

4. (25 min - end at 9:40) TURD THE TARGET - AKA Horizontal Projectile Motion Problem Solving

Watch my video here first for an introduction to what you'll be doing: LINK

Read the following The activity uses a game-like environment to provide you with practice solving horizontally-launched projectile problems. Three sets of two problems are presented to you, with each set differing in terms of the unknown quantity that must be solved for. The unknowns are the initial launch speed of the projectile, the height of the projectile, and the horizontal displacement of the projectile. Once you solve for the unknown quantity, the target is moved into position and "Birdman" flies by and drops a turd. The trajectory is shown and the success of the problem is evaluated. Buckets fill with brown liquid (use your imagination) with each success. Failure results in a temporary leakage of brown liquid. It's definitely a dirty job.

Now, click the link, solve those projectile motion problems, and get those turds to their targets! LINK

5. (15-30min) Projectile Simulator Exercise #3:

If you don't finish this, it's okay. Don't rush. You can finish it for HW.

Complete activity #3 here: LINK

The Physics Simulator is here: LINK

6. Upload a photo of today's notes (all of the above), by the end of Saturday (11:59pm). This will be assignment #022A

HOMEWORK

Assignment #022B: Take your projectile motion problem solving to new heights (see what I did there?) with the Nerd-A-Pult!

Watch the following video, answer the questions, and solve the problem along with Mr. P. His notes (LINK) are very helpful, and your

notes should look like his... (due by next class)

Video --> LINK

WARM-UP: Two-Part Motion (10 min - until 12:31)

1. A woman runs at a velocity of 4.5m/s for 15.0 minutes. How far does she run?

(Use G.U.E.S.S. -it'll make your life easier :-)

A. Given:

B. Unknown:

C. Equation:

D. Substitute helpful Givens into Equation

E. Solve

2. Lets complicate the above problem a little bit, and modify it.

A woman runs at a velocity of 4.5m/s for 15.0 minutes. She comes to a steep hill, and while running up the hill, she slows down at a constant rate of 0.05m/s2 for 90.0s and comes to a stop. In total, how far did she run?

A. How many parts are there to this motion?

B. You're already part of the way done - solve the rest of the problem.

3. Homework Check

Answers:

24: drawing

25: d=1.8km ; t=25min

27: 120m

28: 25s

29: 0.94m/s

CLASSWORK:

1. Two-part motion practice.

Individually, complete problems 31-33 on pg 71

2. FREE-FALL!

Free fall is a special type of acceleration that only occurs when an object falls through the air in Earth's gravitational field. When solving free fall problems, we make the following assumptions.