Hi folks,
I didn't have my camera with me today so I went back in time and pulled out a lecture from a year ago on the same material. Enjoy!
https://youtu.be/ATf3s7k0kog?t=952
Monday, February 25, 2019
2/25 Physics update and homework due 3/11
Hi folks,
First off NO CLASS NEXT WEEK!! It's our spring break. Enjoy the time off everyone!
This week we dove a bit deeper into the concept of energy and work by taking a look at simple machines. We did a lab were we observed the relationship between force, distance and work as it applies to pulleys.
For homework this week,
Read this website, starting on the introduction page and finishing on the terminology page (just keep clicking through).
Answer the following questions regarding the lab we did this week in class.
1. With the pulleys, how did work out relate to work in?
2. What relationship did force have in regards to distance as you worked with the pulleys?
3. As you increased the number of pulleys, what effect did that have on the effort force? What effect did it have on the effort distance?
4. a. If you were lifting a load that required a force of 10N with one pulley, what effort force would be required?
b. Same question, but now you're using 2 pulleys?
c. How about 10 pulleys?
5. a. If you were lifting that load 1 meter, what would the work in distance be for one pulley?
b. 2 pulleys?
c. 10 pulleys?
These question refer to the reading or the lecture.
6. What is the definition of a simple machine?
7. What are 4 things simple machines do? (Looking for the list on the second page of the website.)
8. What are 5 features of a simple machine?
9. Name 6 simple machines. Give me an example of each one.
10. What is meant by the term "mechanical advantage"?
11. When is the mechanical advantage of a slope greater?
12. When is the mechanical advantage of a wedge greater?
13. When is the mechanical advantage of a screw greater?
14. When is the mechanical advantage greatest for each of the 3 classes of levers?
15. I've seen the "wheel and axel" characterized as a kind of a lever. Can you see why this is true?
16. How would you describe the pulley set ups you used in the lab using the definitions from this website?
17. What is meant by input force?
18. What is meant by output force?
19. What is meant by "work in"?
20. What is meant by "work out"?
21. What meant by "load" when it comes to simple machines?
22. What is meant by my statement "simple machines do a flippy floppy when it comes to force and distance?
23. Do simple machines change the amount of work it takes to do a job? (Feel free to use capital letters and exclamation points here.)
Tuesday, February 19, 2019
2/18 Physics Class and homework due 2/15
Hi folks,
Today we got a bit deeper in our journey to understanding energy by getting into the concept of work. We will be getting a bit deeper into this as we use the concept to explore simple machines next week.
Read pages 103 - 110 in the text.
Do questions 1 - 5 on page 119
Also, answer the following questions. (Some are from the book, some are from last week's lecture.)
1. What is the definition of work?
2. What is the definition of power?
3. What unit do we use for work?
4. What unit do we use for power?
5. What is a Newton?
6. Name 5 different types of energy?
7. Describe a scenario where energy is changing forms at least 4 times (like the toaster scenario we did last week).
8. How is work different from power?
9. If a forklift is replaced with a new forklift that has twice the power, how much greater a load can it lift in the same amount of time? If it lifts the same load, how much faster can it operate?
10. Today we went outside and pushed my car. What did that have to do with work? What did it have to do with power?
11. Using your numbers, what work did you do on my car?
12. Using your numbers, what was your power?
13. If, instead of pushing my car you pushed a wheel barrow that took 50 N to push, how far could you push that wheelbarrow using the same amount of energy you used to push the car?
14. In the formula W=FD, what is the relationship between work and force (is it inversely or directly proportional)?
15. In the formula W=FD, what is the relationship between force and distance (is it inversely or directly proportional)?
16. If work stays the same but the force it takes to move an object doubles, what happens to the distance it can be moved?
Monday, February 18, 2019
Some outdoor time for physics today
Hi folks,
We are going to be spending some time outdoors for physics today so please dress for 50F weather.
See you all soon.
Best,
Jim Mueller
(919) 907-3217
Tuesday, February 12, 2019
Resending the homework
Hi folks,
Somehow those last two documents weren't .pdfs. Hopefully these two work.
2/11 Physics update and homework due 2/18
Hi folks,
Today we began our brand new block on energy. Energy is very strange and abstract so we took some time to get familiar with what it is and how we perceive it. We will be getting much deeper into this concept in the upcoming weeks.
For homework this week, do the enclosed .pdf. It is basically a mid-year review. Next week's quiz will be based on much of the material in this pdf so please take the time to understand this material. I've included the answers as well.
Thursday, February 7, 2019
Incorrect homework sheet
Hi folks,
I changed the answer sheet from my original but I sent the original set of questions and not the ones that matched the new answers. These are the questions that match the answers.
Sorry for the confusion folks. Hopefully now the questions match the answers.
Monday, February 4, 2019
2/4 Physics update and homework due 2/11
Hi folks,
Today we used just about every concept we've learned this year and applied our knowledge to the game of Angry Birds. We discovered the impulse, velocity, momentum and more of the different objects in the Angry Birds world. It was a very difficult challenge and folks really did a great job.
Here's a great write up of a fellow who did the same kind of a thing we did today. It's pretty interesting if you want to take a look.
For homework this week, I'd like you to do the enclosed .pdf. This is similar to the Angry Birds analysis but I've provided many of the numbers for you. Look carefully at the measurements I've provided and make sure you use the right times for the right questions. I've provided the answers as well. These kinds of questions could well be coming up on a nearby quiz so be sure to get to know them.
Bring cell phone or tablet to physics!
Hi folks,
If you can, bring a cell phone or a tablet to class today. We are going to be taking a look at the physics of Angry Birds today.
See you all soon!
Best,
Jim Mueller
(919) 907-3217
Subscribe to:
Comments (Atom)