PHYSICS – Wow, we finally made it to the end of chapter 3! Do you realize how much you’ve accomplished? Let’s take it all tomorrow and put it to practice!
How’d you do with relative motion “revisited”? You know, you’ve done this already. The only new part is the motion of objects in the same direction and opposite directions, relative to each other. Don’t forget, you’ll use what you learned about vector addition to work those “boat goes across a river” and “plane experiences a head wind” types of problems.
Here are the answers to tonight’s problems. You can do them!!! (Helps session?)
36) 4.11 m
37) 80 m; 210 m
43a) 10.1 m/s at 8.53° east of north; b) 48.8 m
44a) 14.1° north of west; b) 199 km/h
45) 7.5 min
46a) 23.2° upstream from straight across; b) 8.72 m/s across the river
Physics 9-30 Relative Motion, Jumping on Mars, and Kid on a Slide with a Water Gun from Tammy Skinner on Vimeo.
So far I think I like relative motion problems more than angular projection problems. They make more sense. 🙂 I’m just having some problems coming up with the right answer. I’m pretty sure I’m following the correct steps, but my answers are slightly off on a couple problems. I’m really looking forward to going over them in class.
This week in class I have tried to narrow out my incorrect steps in some of the formulas. I am getting better at the angular projection problems; however, I still have a little trouble sometimes.
Triumph: I think I’m finally beginning to learn how to use those new formulas for these problems! Now I get to use what we’ve learned so far on the rocket lab tomorrow.
Struggle: This week, the problems with trajectory have been pretty tough for me to handle and get a grip on. After these past 3-4 days of persistence on the homework problems, I feel like I can finally do a lot of them without help and have gotten faster.
Struggle: Been a struggle this past week on the trajectory problems especially when given very few variables. However, I have been getting better as the week went on. I’ll be practicing some this weekend in hoping of smoothing out the rough edges for the test!
Although I need to work on getting better at solving the trajectory and resultant problems, I will be practicing it over and over until I can understand and talk through it clearly. It was fun working with the rocket these two days, and I’m so glad we were very close to the goal on our second trial!
I loved applying our new found knowledge about relative motion to the rocket lab! It was very useful to know how to use different factors to determine the distance we needed to set up from the goal.
STRUGGLE: the problems this week have been really challenging for me. It’s hard for me to grasp the concept of a lot of the problems. Which has me really worried about the test! Hopefully re working problems and practicing this weekend will prepare me
ME TOO! I think we need a help session before our test. However, there was a triumph as we shot the rocket REALLY close to our net today, and got our percent error under 10%!
T – What about a help session??
This week I learned so much about two dimensional motion! It’s so cool that I can mathematically find exactly at what distance I need to stand in order to shoot a basketball at a given angle to make it in the hoop! Ball is life!
Rate: I would give myself a 2 out of 5 for this week. I really struggled with both the problems and the rocket lab. However, I think I did a lot better on the worksheet, and I think I am starting to slowly grasp the base concepts of it.
Despite my apprehension, I actually knew how to set up all the problems on today’s test! On the problems I worked to prepare, though, I found myself making several careless mistakes. For today’s test, I tried to be more neat in my calculations so I didn’t plug in a wrong number… and hopefully it worked!