# Conservation of Energy September 21/22

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Conservation of Energy September 21/22
Physical Science Conservation of Energy September 21/22

#. Date Title-Page – Page Number 17. September 21/22 Conservation of Energy – 31 1 2 Leave 4 pages (2 sheets) for the table of contents Number each page in the bottom right corner

Notebook set up Date: Daily work: IN: Objective: Success Criteria:
Synthesis Picture I own this I still don’t understand this OUT: 5 Daily work: 6

In: If an 500 kg object reaches the top of a 10 m hill, how much potential energy does it have? How much work will it do to go down the hill? How much power will be exerted when if it takes 5 seconds to go down the hill?

Goals: Objective: apply the laws of thermodynamics to determine how energy is conserved Success Criteria: Be able to: - describe where energy is present in each form - explain how energy is conserved using quantitative data - describe why a roller coaster works using these laws

Roller Coaster Challenge
You must analyze the physics of a roller coaster from through the lens of work, power, and energy. To do this you will have to rely on your knowledge of energy to determine the best design for a roller coaster.

Background From your reading write a summary paragraph which will help you to answer the questions in your challenge (Be sure to include the necessary equations and explanations to determine the necessary structural designs)

Thermodynamics Energy is the ability to bring about change or to do work. First Law of Thermodynamics: Energy is always conserved Second Law of Thermodynamics : Energy flows from high to low Second Law of Thermodynamics : Movement decreases as energy decreases but never completely stops

Roller Coaster Physics
E = E p + Ek For the totals amount of energy E p = Ek

Background Information
When is there kinetic energy? When is there potential? What happens to velocity as the height increases? Explain this in terms of kinetic energy being changed to potential. Why must the first hill be the tallest? How does the ride slow to a stop safely? Explain in terms of kinetic and potential energy transfers (including work lost to friction) How would you make this ride go backwards? Draw a diagram to help you explain.

Background Information
What happens to velocity as the height increases? Explain this in terms of kinetic energy being changed to potential. Why must the first hill be the tallest?

First sketch the roller coaster that you chose
(you may use one of the examples or create your own) Circle and label where there will be potential energy, repeat for kinetic Make sure there are no stop heights Determine how the ride slows down safely Set reasonable heights to calculate the velocity that riders will be going at 4 points

Label where riders are going a constant rate.
Label 2 places where riders are speeding up. Describe the forces which cause the ride to gain energy and speed up. Label 2 places where riders are slowing down. Describe the forces which cause the ride to lose energy and slow down. Explain the places where energy is transformed.

Synthesis: Something creative…A drawing, a diagram, a question, a sentence that represents your thinking from this class period.

I own this: I still don’t understand this:

Out: Why is the first hill of a roller coaster so important? Explain what other factors affects the safety and thrill factors of the ride?

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