Conservation of Energy Investigation Law of Conservation of Energy: Energy is neither created or destroyed; it is simply transferred from one storage place to another. This is not the same thing as "conserving energy", which implies that we need to imit our energy usage and use our resources wisely. /18 1. Go to http://phet.colorado.edu/ and search for Energy Skate Park (not Basic). Use the 'Intro' page and select a skater of your choosing from the menu. Keep the default settings. Click on the green '+' button to open the bar graph in the upper left. Position your skater at the top of the track and release them to answer the following questions. 18 a. Where does the skater have the most kinetic energy? track b. Where does the skater have the most potential energy? nl awords obie argh side C. Adjust the Friction so that the coefficient of friction is about 30% of 'Lots'. What happens to the motion of the skater? Where does the initial mechanical energy go? Is the Law of Conservation of Energy upheld? the d. Set the Friction back to 'None' and change the Gravity to 'Lots'. How does the relative speed of the skater change, compared to before? Why (be specific with reference to an equation)? What happens to the speed if you change Gravity to 'Tiny'? 2. Go to www.explorelearning.com. Use the class enrolment code FWENWPJWGV if you are in Section 31 and NPTVGM if you are in Section 41 to gain access to the 'Energy Conversions' gizmo. Explore in 'Path Mode' at least three different energy transformations. List these below. Also, answer the 5 Assessment Questions below the Gizmo page. 16 siddur) violupeld sell bread to youaloma be.(3. Electricity-generating resources, such as coal, natural gas, and nuclear fuel, contain more energy than the electricity that is generated from them. More electricity is generated than is put to useful purposes. Where does the energy get "lost"? Energy conversions are not very efficient. Most of the energy is lost as heat as it is converted from one form to another. There are further losses as the electricity travels from the power plants to homes and businesses, as the voltage is increased for long-distance transmission and transformed to lower voltage for use in homes and businesses. Some newer thermal power plants (those that heat water to generate electricity, including fossil fuel and nuclear power plants) are combined heat and power (CHP) plants; these power plants capture some of the waste heat to generate more electricity. The diagram shows the electricity flow in 2018. The left side shows the sources used in electricity generation, and the right side shows the end uses for generated electricity. The line widths are proportional to the amount of energy at each step of the process. Notice the difference between the amount of usable electricity (on the right side) versus the amount of energy contained in the generating sources (on the left side). Source: https://www.nationalgeographic.org/activity/energy-efficiency/ Total energy from all Electricity Flow, 2018 generating sources: 38.81 (Quadrillion Btu) End uses for the generated electricity coal: 12.03 Based on estimated from EIA Annual Energy Review 2018 transmission and delivery loss: 0.94 United States Energy Information Administration (cia.gov) Energy conversion losses: 23.78 conversion plant use: 0.77 loss for all sources natural gas: 11.20 Total generated electricity direct use: 0.49 end use: 15.18 commercial: 4.70 nuclear: 8.44 industrial: 3.25 gross generated: 15.03 renewables: 6.64 residential: 5.00 petroleum: 0.25 other: 0.18 other gases: 0.07 net imports: 0.15 transportation: 0.03 Using the equation %Efficiency Energy Out Energy In " X 100% calculate: /4 a) % Efficiency of Gross Generated Electricity from All Generating Sources b) % Efficiency of End Use Electricity (subtract transmission and delivery loss) from Gross Generated and Net Imports