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Download Energy Transfer Activities - Tuckahoe Common School District
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Transcript
LIGASE Elementary School Physics Table of Contents Energy Types & Conversions Electricity Light Magnetism Sound PE & KE Heat ENERGY • Definition: the ability to cause a change. Types of Energy • • • • • • Heat - the motion of molecules Mechanical - motion of objects Sound - vibration Chemical - chemical reactions Light - visible and invisible waves Electrical - electricity & magnetism Conservation of Energy • Definition: energy cannot be created nor destroyed, but can be transferred from one form to another. Energy Transfers • One form of energy can turn into another form. For example: – A ball thrown against the wall represents mechanical energy. The ball does not bounce back at the same speed, in part, because some of the mechanical energy is converted to sound and heat Energy Transfer Activities • Bring in different toys and household items that illustrate multiple energy transfers. Have students identify each energy in the toy/item. • Most energy that is “wasted” in an energy transfer is converted to heat. Energy Transfer Activities • Batteries (chemical) • Electricity (electrical) • Motor turns (mechanical) • Motor makes noise (sound) • Motor gets warm (heat) • Wheels turn (mechanical) • Friction on the floor (heat) Energy Transfer Activities Jack-in-the-Box Now you identify the energy transfers. Energy Transfer Activities Wind-up Mouse Identify the energy transfers. Energy Transfer Activities Wind-up Mouse Identify the energy transfers. Energy Transfer Activities Wind-up Mouse Identify the energy transfers. Energy Transfer Activities • Have students make “Rube Goldberg” drawings illustrating multiple energy transfers. Each drawing should include a number of tasks leading up to a final goal (ex. making toast). Energy Transfer Activities Potential Energy • The energy stored in an object. Gravitational Potential Energy • The stored energy of position. • Weight (N) = mass (kg) x gravity (9.8 m/sec/sec) – 100 kg 100 kg x 9.8 m/sec2 • GPE = weight x height – 980 N x 10 m 10 m = 980 N = 9,800 Kinetic Energy • The energy of motion. 100 kg Average Velocity 5 m/sec • KE = (m x v2) / 2 – (100 x 52) / 2 = 1,250 Pendulum Potential Kinetic Pendulum Potential Kinetic Pendulum Potential Kinetic Pendulum Potential Kinetic Pendulum Potential Kinetic Pendulum Potential Kinetic Pendulum Potential Kinetic 100% PE 50% PE 50% KE 100% KE
