Power, ReviewWednesday, January 20, 2016

Wednesday, 1/20 On your warm-up respond to the following:

Take out your power practice problems from Friday. Refer to problem #8 and respond to the following:

What is Bart’s PE when he reaches the top of the stairs? What is Bart’s ΔKE? Could you have used this information to calculate Bart’s work instead of making work a two step problem?

Upcoming dates: Friday, 1/22 – Work, power, energy quiz Friday, 1/22 – review due when the late bell rings Monday, 1/25 – Work, power, energy test. Monday, 1/25 – last day to turn in any missing assignments for work, power,

energy unit. See my website for additional important dates.

Warm-up ReviewBart runs up a 2.91 meter high flight of stairs at a constant velocity in 2.15 seconds. If Bart’s mass is 65.9 Kg, determine the work which he did and his power rating.

Power LabObjective: Each group will plan how they can produce the most power. The most powerful group wins the competition!

Name/Team Roles – First Steps Record your group name Designate people for the following roles: Runner (this is the person who’s work and

power will be calculated) Recorder (person who will write the data down) Counter (this person will keep track of how

many reps the runner makes) Timer (someone to keep track of time and tell

the runner to stop).

Plan your strategy! Convert the team runners weight from pounds to

Newtons (see link on my webpage). Decide on the number of steps that you will ascend

(choices include 2, 6, or 12). This will determine your total displacement.

Determine the total time your runner will ascend (and descend) the steps (choices include 15s, 30s, or 60s). Remember your goal is to be the most powerful!

Have your Mrs. Cheyne sign off on your roles and plan.

Record team name and basics

Collect lab data

Calculate power to determine winner! Complete your calculations

Winning team announcement!

Complete Summary/Bonus Question After your group has completed the

summary/bonus question do the following: Make sure all group members names are

on the lab write up sheet. Staple all of you lab documents together

and turn in to the black tray.

Cool Down Is there a concept for the mechanical

energy unit you are feeling ‘muddy’ about?

List two things you need to do in order to be successful on Tuesday’s test?

Review Review is due when the late bell rings

on Friday. If your review is a 100% complete you

will earn five additional points.