Work, Energy,
Power
Thursday, January 13, 2016
Thursday, 1/14
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On your warm-up respond to the following:
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Take out your Work and Energy CNs.
Answer the essential question.
If you have completed your practice questions from Monday,
show me as I am stamping warm-ups and I will change your
grade.
Upcoming dates:
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Thursday, 1/14 - quiz
Monday, 1/18 – Martin Luther King Holiday
Thursday, 1/21 – Work, power, energy quiz
Thursday, 1/21 – 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.
Lab – Review Data Table
Energy Lab – Pre-lab
 Review
instructions with your group
 Familiarize yourself with the equipment
 Understand your output (summary
questions and graphing)
Energy Lab – 25 Minutes
Finish Practice problems
Work Energy Quiz – 15 minutes
Cool Down
 Describe
the relationship between ME, PE,
KE as the cart in the lab moved down the
ramp.
Elastic Potential Energy
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Read the information about potential energy
During your second reading, highlight the
following words:
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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 10-3 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 10-3 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.
Summarize