# HP Cycle 27

## 2/20 - 2/23

T 2/20

W 2/21

Th 2/22

F 2/23

### 🟢 5: T 2/20 - ↩️ Pivot ballistic pendulum lab (1)

Today, we'll start class by discussing a classic physics problem - the ballistic pendulum.  This problem combines ideas of conservation of momentum and conservation of energy.

Then, we'll look at another lab in ↩️ Pivot Interactives called "Ballistic Simple Pendulum Challenge."  This is a classic physics problem which will give us the opportunity to think through the different problem solving methods we have learned in this class up until this point.  Traditionally, ballistic pendulums are used to measure the velocity of fast-moving projectiles such as bullets.  After making measurements using a model, we will explore the differences between the expected and actual results.  We'll have some time next class to finish this lab.

Homework:  New policy - no late work will be accepted after the unit assessment.  Finish 📖 Mastering Physics sets - "Ch 9 - Collisions" by Tuesday, February 20th at 10pm.  Finish the ↩️ Pivot lab by Wednesday, February 21st at 10pm.  Remember, no late work accepted in ↩️ Pivot.  QUIZ on Impulse and Momentum in 1-D next class - Wednesday, February 21st.

If you missed class or need support on this problem, you may watch this video:

### 🟩 5: W 2/21 - 📖 momentum & energy problems

QUIZ on Impulse and Momentum in 1-D on Today.

Today, if you haven't finished the lab ↩️ Pivot Interactives called "Ballistic Simple Pendulum Challenge," do that first.

Then, do 📖 Mastering Physics problems "Ch 10 - Momentum & Energy" problems: 83, 86, 87.

Homework:  Finish the ↩️ Pivot lab by Wednesday, February 21st at 10pm.   Remember, no late work accepted in ↩️ Pivot.  Finish 📖 Mastering Physics problems "Ch 10 - Momentum & Energy" by Thursday, February 22th at 10pm.  Lab Quiz on Ballistic Pendulum next class - Friday, February 23rd.

### 💚❗ 5: F 2/23 - 📖 2-D collisions

Lab Quiz on Ballistic Pendulum TODAY!

Today, after the quiz, we'll remember that momentum is a vector and discuss momentum problems in two-dimensions.  The discussion will brief and touch upon our previous experience with two-dimensional vectors.  We'll do the first problem from this Momentum 2-D presentation.

Then, we'll do 📖 Mastering Physics "Ch 9 - 2-D Collisions" problems: #35, 39, 63 (plus colliding cars problem).

Optional Grade Insurance:  Two optional opportunities to raise your grade are below.  Both assignments are due on Wednesday, February 28th at 10pm, ABSOLUTELY no late work on these extra assignments, no exceptions.    ABSOLUTELY NO LATE WORK WILL BE ACCEPTED.

Optional extra practicepages 2 and 3 in Momentum Packet.  (SOLUTIONS to Cons Momentum CompuSheet & SOLUTIONS to Momentum Practice Problems p 3)

Homework:  New policy - no late work will be accepted after the unit assessment.  Finish 📖 Mastering Physics "Ch 9 - 2-D Collisions" due Tuesday, February 27th at 10pm.  Unit Assessment on Work, Energy, & Momentum on Thursday, February 29th.

Here's a really good video showing the full calculations involved in a complex 2-D collision: