Physics 10-29-19 Newton’s 2nd & 3rd and Friction

PHYSICS: Why don’t things that are moving just keep moving? Here is our intro on friction from today. First though, a look at Newton’s 3rd law and 2nd law.

Remember a few key things. One of the most important – net forces produce acceleration.

You can find Ff a couple of different ways – it’ll be part of a net force equation and can be found from the coefficient of friction equation. If and ONLY if your object is moving at a constant velocity, Ff will equal Fa. Fn is only sometimes equal to Fw. If your object is pulled at any angle (or pushed), Fn will be a part of Fnet in the vertical direction.

Whew! 🙂

flickr photo by kbaird

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12 thoughts on “Physics 10-29-19 Newton’s 2nd & 3rd and Friction

  1. This week I rate myself a 3/5. I did well with the new information we learned this week, but I did not perform very well on the PSAT. I did very well on the english and math but the reading was rather difficult for me. However, there is no point in worrying about it now; it is over. I enjoyed the new material we covered this week, and I feel like I grasped it pretty well. I really enjoy being able to support common life occurences with mathematics. It helps me to bring order to the world around me. This week has overall been a success, and I hope to have more like it.

  2. This week I rate myself a 5/5. I have to do it very once in a while. I am not saying I had a perfect week, but I am saying that I had a good attitude and outlook throughout the week. I am never going to be perfect in my grades, so what is the point in grading yourself based on performance? I am slowly learning to give up the highs and lows of living off of performance, emphasis on SLOWLY. It is a work in progress, and I am praying God will show me how to live in that light.

  3. This week I rate myself a 1/5. I’m getting the concepts somewhat, but I’m still struggling to focus outside of class with homework and studying. I know its a process, but I need something to work, and fast. Also: what the hecky is up with this incline tomfoolery??? My brain hurteth

  4. This week I would rate myself a 3/5. I did not have much dedication and enthusiasm in my work this week. I stayed up very late last night because I could not make myself do my work until it was very late. I slightly redeemed myself today, though, as I worked hard on the new problems, and I learned the concepts easily. Next week is going to be busy for me, so I need to be sure that I am staying ahead in my studies and college applications.

  5. This week in physics is a 3/5 for me. The concepts make sense to me, but understanding all the types of forces is a bit confusing. I’m sure more homework practice will help me out. Looking forward to next week.

  6. This week I would rate myself 3/5. I keep putting off my lab write ups and I have procrastinated on doing this Newton project. However, I’m grasping the problems more quickly than usual. I plan on grinding the labs this weekend so no one talk to me.

  7. This week was a triumph for me. I finished all my homework and I’m feeling more confident in attempting the problems on my own. I feel like I’m collecting more and more “tools” in my arsenal in which I can find certain unknown variables. I hope to continue to practice and get some labs done next week.

  8. This week was literally amazing. I’m not sure why but this forces thing we’re learning I totally understand it and I’m doing great

  9. I totally struggled with the lab this week even though it was supposed to be easy. At this point, I’m not even sure what made it so confusing. Now, we have it figured out and are planning to get it done. On another note, let’s hope I can get on top of my homework and lab write up situation this weekend!

  10. I’m just flat out confused after today’s lesson. Zorba is enough for me. Hopefully with some more homework practice with the incline stuff, I’ll understand the concepts better! And we won the football game tonight so I’d say this week was pretty good!

  11. I would rate myself a 3/5 for this past week. This week has been a blessing in that I technically didn’t have school Wednesday. However, my lazy buzzer has been going off like crazy. It’s been interrupting my week. I’m not sure how productive you could say my week was, but I did make it through. In physics, especially, I actually understand what’s going on. Therefore, I’d say I completed this week pretty well.

  12. This week in physics I rate myself a 3.5/5. I understood the concepts near the beginning of the chapter, and sometimes I feel like I’m understanding the rest, but other times I am completely lost. Hopefully I can get enough rest to refresh my brain for next week!!

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