# HP Cycle 22

## 1/20 - 1/25 F 1/20 M 1/23 T 1/24 W 1/25

### 🟢 5: F 1/20, 🔵 7: M 1/23 - ↩️ Pivot circular motion lab (2)

Today, we'll start class with a geometric derivation of centripetal acceleration. If you missed class or would like to review the derivation from class, you may watch the video. We'll use the rest of class time to share data and make conclusions in the lab.

Homework: Finish the ↩️ Pivot Interactives lab by Sunday at 10pm for period 5 and Monday at 10pm for period 7.

Optional Extra Practice: Centripetal Acceleration and Force CompuSheets. ANSWERS.

### 🟩 5: M 1/23, 🟦 7: T 1/24 - uniform circular motion problems

Today, we'll spend time working through some circular motion example problems:

Vertical circles are an example of where gravity combines with some other force to account for the centripetal force. Remember "centripetal force" is another word for NET force when going in a circle.

With any remaining time, you may start 📖 Mastering Physics circular motion problems from the next post.

Optional Extra Practice: If you need extra practice on easy UCM problems, Circular Motion Practice worksheet (Ans: 1. (a) 8.77m/s2 (b) mass times 1a. 2. (a) 1.56m/s (b) mass times 8.11m/s2 (c) 8.11m/s2. 3. (a) 0.650 (b) no change. Hard Circular Motion Problems. (skip #9) ANSWERS. - note: for #3a, an acceleration of “1g” is 9.8 m/s2, so an acceleration of 0.050g is (0.050)(9.8 m/s2).

Homework: If you missed class or would like to review, check out these videos on vertical circles:

### 💚 5: W 1/25, 💙 7: W 1/25 - 📖 Mastering Physics circular motion

Today, we'll start class with one quick Orbit Problem, which combines the ideas of uniform circular motion with universal gravitation.

Then, we'll do 📖 Mastering Physics problems "Ch 6 - circular motion" #13, 16, 21, 23, 49, 50, 61, 62, 63, 67, 69, 73.

Homework: 📖 Mastering Physics problems due Friday at 10pm. Assessment on Gravitation and Circular Motion Tuesday, January 31st. If you missed class or need help with orbit problems like we did in class, watch the following video: