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Physics is Phun

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http://phet.colorado.edu/en/simulation/ener gy-skate-park-basics http://phet.colorado.edu/en/simulation/ener gy-skate-park-basics

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Check the square for the pie chart. Notice the colors-thermal, kinetic, potential. How does the kinetic energy relate to potential energy? Why is thermal energy absent? What happens when we increase friction? How does the pi chart effectively communicate the law of conservation of energy.

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Check the bar graph. Run the program noticing how the energy is shown on the bar graph.

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Check the box for the speedometer. 1. How would you describe the speed at various points on the track? 2. Where is the speed the greatest? Describe the types of energy at this point. 3. Where is the speed the least? Describe the types of energy at this point.

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Take a few minutes and try the other track options. Observe the speed, energy. Vary the friction of the skateboarder.

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A B C D

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A B C D

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Now create your own skate park. How does the law of conservation of energy influence your considerations.

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Check 3231.1.17 Investigate the definitions of force, …, kinetic energy, and potential energy. Kinetic Energy: EK = 0.5mv Potential Energy: EP = mg∆h. SPI.3231.1.6 Given the static and kinetic friction coefficients ( μ s and μ k); select the appropriate coefficient of friction and calculate the force necessary to move the object.

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