2019 Cary High School Physics

https://youtu.be/SA82oZV2iw

Hi folks, Today we took our energy unit up a notch by really getting into the math behind gravitational potential energy, kinetic energy and work.  To bring the math to life, we did a lab where we compared the gPE of a ball to the work done by the ball on a pair of blocks.  We also found the energy efficiency of the system. For homework answer the following questions.  I've included answers so you can check yourself.  Be sure to really understand these by next week.  Quiz is coming!  Also, look back at that review homework you did a few weeks back.  Next weeks quiz will include some of that material as well. The following questions are based on today's lab. Formulas KE = 1/2mv^2 gPE = mgh Work = fd Energy Efficiency = (work out/ work in) x 100  Should always be less than 100) What was the work in, in other words, what type of energy did you put into the system? 2.    What was the work out?  In other words, what did the energy...

https://youtu.be/CvPsdMAJnuI

Hi folks, 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.   By the way, there WILL be a quiz next week.  It's been awhile so I'll give you some tips as to what to study for.  Study the review homework you did two weeks ago.  Some of those old math problems will be on the quiz as well as some questions about Newton's laws, momentum, inertia etc.  Also, study the energy material we've covered so far.  Definition of energy, PE and KE, that wacky roller coaster problem, definition of work etc.  Don't worry about this pulley, simple machine stuff yet.  It will be on an upcoming quiz but not this next one. 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 r...

Part 1 Part 2

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. For homework this week: Read pages 103 - 110 in the text. Do questions 1 - 5 on page 119 Also, answer the following questions.   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.  What is potential 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 outs...

Hi folks, We are going to be doing some stuff outside today so please be sure to dress appropriately. See you all soon! Best, Jim Mueller (919) 907-3217

Part 1 Part 2

Hi folks, Today we talked about energy and how we interact with it as a human being, how we perceive it, how we get it and how we use it.   For homework this week I want you to do the enclosed. pdf.  It's a review of many of the concepts we've touched on this year.  It sure looks to me like there are a bunch of wonderful quiz questions on there so I'd spend quite a bit of time with this if I were you. (Hint, hint)  I've included the answers as well.   Also, for extra credit, do the second enclosed .pdf.  Lot's of math there so give it your best shot.  I'll give you some extra credit for each question you get right.  Maximum 10 points of extra credit.  Good luck!

Hi folks, Please bring some sort of internet connectable device to physics today. See you soon. Best, Jim Mueller (919) 907-3217