Today we worked on whiteboards to solve friction problems. The problems that we worked on and their solutions can be found here..
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Today we finished up talking about friction. You should understand the difference between static friction and kinetic friction, how to calculate each, and when each applies. We also began solving problems involving friction.
If you are struggling with some of the content in this chapter, here are some helpful videos that you can watch to review specific concepts:
Twu Physics has helpful videos by topic. Videos 1 - 18 apply to the chapter we are working on (forces, Newton's laws, friction, inclines, pulleys, interacting objects). Flipping Physics also has helpful videos: Newton's Law of Universal Gravitation and a second video here Forces on an incline Apparent Weight (from A Plus Physics) Friction Intro Coefficient of Friction Friction on an incline Understanding the force of friction equation Friction problems Dynamics Review Go to the Spaceneedle (or any other tall building with an express elevator).
Using a scale, determine the acceleration of the elevator at the bottom and the top for a trip up the tower. You must have a picture of you in the elevator on the scale (with your group in it as well) Show all assumptions/work/calculations (each person must hand in individual work!) Tallest building gets 1 extra point Worth 10 points in whatever category you choose Due by January 12, 2018 (no late submissions!) Today we began the friction lab. You are experimentally determining the coefficient of static friction, and the coefficient of kinetic friction between a block and a board. We will finish the lab on Wednesday.
Today we finished talking about apparent weight. There is an extra credit opportunity that I will describe in another post. You should continue working on webassign and asking questions if you get stuck!
Today we worked on several practice problems dealing with gravity. Keep working on the webassign!
Today we talked about the difference between mass and weight, and we learned how to calculate the gravitational force between any two masses using Newton's Law of Universal Gravitation. There is a webassign to practice these concepts.
Today we did some practice problems to find net force when there were forces in many different directions. Then we started talking about Newton's 3rd law.
Today we talked about the graphs from the lab. Your graphs showed that the acceleration was proportional to the net force, and inversely proportional to the total mass of the system. This is Newton's 2nd Law. We then applied this concept to various problems. There is a webassign to practice these concepts.
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Reminders:
Chapter 2 test retake is Wednesday 10/17. You can take the retest either before school or after school, but you must complete all of the Chapter 2 homework (75% completion on each assignment) to be eligible for a retake!
Resources:
If you want to review topics, you can find excellent videos here.
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