Work and Power Tuesday, January 3, 2016

Tuesday, 1/3 Unit: Work and Power Update your planner with the upcoming dates below. Upcoming dates Monday, 1/9 – Lab quiz, work/power quiz Friday, 1/13 – Lab quiz, conservation of energy quiz Wednesday, 1/18 – Lab quiz Friday, 1/20 – review due, unit quiz Tuesday, 1/24 – unit test

Refreshing the memory Take out your energy notes from December and discuss the questions below with your elbow partner. What is the first step in analyzing the energy of a system? What are three specific types of energy we have explored? What equations have we used for potential and kinetic energy?

CN’s Read and highlight CNs (stop when you get to example 1)

CN’s Continue reading and highlighting CNs (stop when you get to example 2)

A) A 200 kg truck is moving at 10 m/s A) A 200 kg truck is moving at 10 m/s. How much work is needed to speed it up to 40 m/s over a distance of 50 m? B) What was the average force on the truck?

CN’s Continue reading and highlighting CNs and answer your EQ in the summary section of your notes. Read and highlight the CNs (stop at example 3).

When doing a chin-up, a physics student lifts her 42 When doing a chin-up, a physics student lifts her 42.0-kg body a distance of 0.25 meters in 2 seconds. What is the power delivered by the student's biceps?

CN’s Answer your EQ in the summary section of your notes.

Practice Questions When you are finished with your practice questions (part 1)do the following: Show me your work so I can enter your grade in the grade book. Check the key Pick up practice questions part 2 and complete. When you are finished with your practice questions (part 2) do the following: Note: if you don’t finish in class it is homework. Homework check/quiz will comprise of one or more of the questions from today’s practice problems.

Cool Down What would cause the following situations to occur (make sure you write in a complete sentence). Energy is gained Energy is lost Energy does not change