8.2 Power

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Do Now 1. A bug sits on the back of a resting Hippo. The Hippo carries the bug across the lake for a distance of 20 meters. How much work is done by the mouse? 2. You pick up your 125 N book bag 2 meters off the floor. How much work did you do? 3. You lift two garbage cans that each weigh 35 N up 0.5 meters. You carry them 25 meters to the door. How much work was done? 4. A machine does 50,000 J of work to lift a rock a distance of 5 meters. How much did the rock weigh? 8 minutes

QUIZ!!! (no talking until all sheets are up) A 700-N person lifts his 200-N bookbag upward a distance of 1 m. He walks 10 meters to throw away some trash and another 5 meters to catch his bus. How much work was done? 5 minutes

Announcements Journal check next class You will have time to set up your journal at the end of class IF YOU DO NOT FINISH IT IS HOMEWORK IF YOU DO NOT FINISH IT IS HOMEWORK Updated grades

Expectation for Notes C – none H – group A – fill in guided notes sheet/or copy into journal M – none P – everyone (this is timed) S – prepared for any test/quiz on the material!

8.2 Power The rate at which work is done is called power. It makes a difference how fast you do work.

8.2 Power Michael and Jim do the same amount of work. Jim’s power is greater because he gets the work done in less time.

Power is calculated in watts. One watt (W) is equal to 1 joule of work per second. James Watt, a Scottish engineer, invented the steam engine. James Watt explained power as the number of horses his engine could replace. horsepower One horsepower still equals 746 watts. Horsepower

8.2 Power P = W t Time (s) Work (joules) Power (watts)

Solving Problems Allen lifts his weight (500 newtons) up a staircase that is 5 meters high in 30 seconds. How much power does he use?

Expectations for Skill Sheet C – accountable talk (on topic ONLY) H – use partner or group ONLY A – 8.2 skill sheet M – none P – everyone (this is time sensitive) S – prepared for any test/quiz on the material! 20 minutes

I do…

Copy Graphic Organizers into journal If you do not have the notes listed, you must copy them into your journal If you do not have the notes listed, you must copy them into your journal You will not be given any new guided notes unless you were absent that day You will not be given any new guided notes unless you were absent that day Make sure everything is glued in or stapled in Make sure everything is glued in or stapled in YOU MUST HAVE A JOURNAL. I will not grade notes only… YOU MUST HAVE A JOURNAL. I will not grade notes only… This is a big part of your grade most of us need this! This is a big part of your grade most of us need this! Journal Set-up (for “the check” NEXT CLASS ) Journal Set-up (for “the check” NEXT CLASS ) OR Free information that can be used on a test or quiz Free information that can be used on a test or quiz Will be counted as extra credit Will be counted as extra credit EXPECTATION: You must be working on something until the bell rings EXPECTATION: