# HP Cycle 19

## 1/3 - 1/6

T 1/3

W 1/4

Th 1/5

F 1/6

### ๐ข 5: T 1/3, ๐ต 7: W 1/4 - inclined plane pulleys

Today, we'll try some even harder pulley problems. If you need some ideas on how to approach these problems, you can watch the video below, but don't forget to write a ฮฃF statement in the y-direction to get your normal force for the mass on the incline. We'll finish ๐ Mastering Physics "Ch 5 - inclined plane problems": 24, 25, 28*, 30*, 65, 77, (* need to look at coefficient of friction table) and also #MQ22, MC30, 63, 83 on inclined plane pulleys.

Optional Extra Practice: Table Top Pulley Problems, SolutionsSolutionsSolutionsSolutions #3-4

EXTRA CREDIT: โฉ๏ธ Pivot lab "Friction: sliding on an inclined plane." Due Thursday, January 5th at 10pm. No late work accepted.

Homework: ๐ Mastering Physics "Ch 5 - inclined plane problems" due Wednesday, January 4th at 10pm. Quiz on inclined planes (pulleys included) Friday, January 6th!

### ๐ฉ 5: W 1/4, ๐ฆ 7: Th 1/5 - friction and vector forces

Today, we'll look at one other kind of problem - we pull or push a block at an angle. We'll see that when we do this, the normal force is NOT equal to the force of gravity! We'll try to finish Friction & Vector Forces during class. Watch the video...

EXTRA CREDIT: โฉ๏ธ Pivot lab "Friction: sliding on an inclined plane." Due Thursday, January 5th at 10pm. No late work accepted.

Homework: Finish Friction & Vector Forces (SOLUTIONS) and upload your solution to โ๏ธ Google Classroom by Friday, January 6th at 10pm. Quiz on inclined planes (pulleys included) Friday, January 6th!

### ๐โ 5: F 1/6, ๐โ 7: F 1/6 - projectile motion intro

Quiz on inclined planes (pulleys included) TODAY!

Today, weโll start looking at projectile motion. Weโll start by looking at projectiles launched horizontally. Weโll discover that projectiles move at constant velocity in the horizontal direction where thereโs no net external force, whereas they move with constant acceleration (g) in the vertical direction where the external force is due to gravity. (Air resistance is ignored.) In order to solve projectile motion problems, we often split the problem into x- and y-components, and then combine x & y with time.

Presentation: Projectile Motion PowerPoint

Homework: For more support, watch the following two videos by Dan Fullerton. They are both on projectile motion. Watch only the first 11 minutes of the first video, and watch the entire second video. The second video contains examples which you need to work through alongside Mr. Fullerton.