Work, Energy, Power Friday, January 15, 2016. Friday, 1/15  On your warm-up respond to the following:  Take out your practice problem packet from Monday/Wednesday.

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Presentation transcript:

Work, Energy, Power Friday, January 15, 2016

Friday, 1/15  On your warm-up respond to the following:  Take out your practice problem packet from Monday/Wednesday  Refer to the diagram for questions  What is the kinetic, potential, and mechanical energy values for point E (last point in the diagram). Upcoming dates:  Wednesday, 1/13 – Work and energy quiz moved to Friday, 1/15  Monday, 1/18 – Martin Luther King Holiday  Wednesday, 1/20 – Work, power, energy quiz; quiz moved to Friday, 1/22  Wednesday, 1/20 – review due when the late bell rings. Review moved to Friday, 1/22  Friday, 1/22 – Work, power, energy test. Test moved to Monday, 1/25  Friday, 1/22 – last day to turn in any missing assignments for work, power, energy unit. Requirement moved to Monday, 1/25  See my website for additional important dates.

Work Energy Quiz – 15 minutes

Elastic Potential Energy  Read the information about potential energy  During your second reading, highlight the following words:  Spring  Elastic  Energy  Potential energy  Stretch  Compress  Force  Spring constant  Equilibrium position

Elastic Potential Energy Example A plastic bullet with a mass of.45 kg is put into a toy gun. The spring in the gun has a spring constant of 200 N/m. The spring is compressed.20 meters before the bullet is released. What is the potential energy of the bullet before the trigger is pulled?

Practice problem 1 A plastic bullet with a mass of.20 kg is put into a toy gun. The spring in the gun has a spring constant of 100 N/m. The spring is compressed 4.0 x meters before the bullet is released. What is the potential energy of the bullet before the trigger is pulled?

Practice problem 2 A plastic bullet with a mass of.35 kg is put into a toy gun. The spring in the gun has a spring constant of 300 N/m. The spring is compressed 6.0 x meters before the bullet is released. What is the potential energy of the bullet before the trigger is pulled?

Power  Read your CNs and highlight the following words: rate, work, time, increase, decrease.

Draw a illustration of Power  Share with your elbow partner

Analyze the graph  List two observations about the graph  What does the line in the graph represent.

Important to remember…  W = F * d  F = m * a

Example Problem #1

Partner Practice  Complete example problem #2 and #3.

Cool Down  What is the relationship between work and power?

Power Practice  No more than four to a group!

Power Lab Planning