# HP Cycle 18

## 12/21 - 1/3

T 12/21

W 12/22

Th 12/23 (half day)

M 1/3

### π’β 6: T 12/21, π΅β 8: T 12/21 - inclined planes

Today, weβll look at how we can apply what we know about vectors in two dimensions to inclined plane problems. The key to inclined plane problems is picking a coordinate system that makes sense. We must shift our thinking from a traditional horizontal-vertical coordinate system to a slanted coordinate system. We'll extend the discussion to link to our inclined plane lab that we performed a long time ago. We'll talk about what factors affect the motion of an object on an inclined plane theoretically and in real life.

If you missed today's lecture or you need to review some, watch the following video.

Homework: Review your notes and write down any questions you may have about solving inclined plane problems.

### π© 6: Th 12/23, π¦ 8: W 12/22 - friction on inclined planes

Today, we'll perform a lab to check our understanding of friction and inclined planes. You'll be collaborating with your lab group finding two different methods for finding the coefficient of static friction. You may only use a spring scale for one of the two trials.

Homework: Finish your write up for this lab to be turned in in class on Tuesday, January 4th.

### π 6: M 1/3, π 8: Th 12/23 - β Positive Physics inclined planes

Today, we'll apply what you've learned about inclined planes to β Positive Physics problems. Do the "work" problems from unit 9: inclined forces from the following sections:

• preparation problems

• complete problems 1

• complete problems 2

Only completion score counts, so try the problems till you get them right. Problems are due on Tuesday, January 4th at 10pm. No late work will be accepted.

Homework: β Positive Physics problems above due Tuesday, January 4th at 10pm. Also, don't forget to finish your write up for the inclined plane friction lab by next class - Tuesday, January 4th.

Optional Extra Practice: Do page 6 of the Newton's Second Law packet (skip 3c). You may check Solutions to Inclined Plane Problems, but try them on your own first!