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Forms of Energy Talk to your group and make a list of all the types of energy that you can think of. Eight Basic Forms of Energy • • • • Mechanical (Kinetic & Potential) Thermal/heat Light Sound The units for energy are Joules (J) or Calories. • • • • Chemical Nuclear Magnetic Electrical Mechanical Energy Energy of motion and position • Kinetic – energy of motion • Potential – energy of position – potential to move Mechanical Energy Mechanical Energy Gravitational Potential Energy Ug Ug = mgy m = mass (in kilograms) g = acceleration due to gravity (9.8 m/s2) y = height Taylor has a mass of 75kg and climbs up on a desk 1 m off the floor. What is his gravitational potential energy with respect to the floor? Thermal Energy • Energy associated with temperature. • All objects have thermal energy if they are not at absolute zero. • An object has more thermal energy at a high temperature than it does at a low temperature. Electromagnetic waves – Light Energy Here’s another representation of Electromagnetic waves. This one shows you examples of the size of the different waves and at what temperature an object must be to emit these waves. Sound Energy • Recall that a sound wave carries energy • A wave is really energy in motion Chemical Energy • Energy released (or absorbed) when elements are rearranged into new compounds. • Energy released (or absorbed) in a chemical process. Nuclear Energy • Energy released (or absorbed) when elements change into new elements. The worlds first atomic bomb test in New Mexico on July 16, 1945 Magnetic Energy • Energy can be stored in a magnetic field. Electrical Energy • Energy of moving electrons. What form is it? Flowing water? A. B. C. D. E. It is Chemical energy It is Mechanical energy It is Thermal energy It has/carries Mechanical energy It has/carries Chemical energy What form is it? A Battery contains? A. B. C. D. E. Chemical energy Electrical energy Thermal energy Potential energy Light energy What form is it? Wood? A. B. C. D. E. It is Chemical energy It is Thermal energy It is Potential energy It has/contains Chemical energy It has/contains Thermal energy What form is it? What form of energy does a banana have? A. B. C. D. E. Chemical Mechanical Sound Light Magnetic What form is it? What form of energy do the lights in this room give off? A. B. C. D. E. Chemical Nuclear Light Heat Electrical What form is it? What form of energy does the projector in this room give off? A. B. C. D. E. Thermal Light Sound A and B A, B and C Conservation of Energy • Energy can never be created or destroyed. It can only change forms. Kinetic and Potential Energy 1. If the skater starts at rest at this point, what kind of energy does he have? A. Electrical B. Kinetic C. Potential D.None 2. As he skates across the bottom? A. Electrical B. Kinetic C. Gravitational Potential D.None Energy Form If the skater is released from rest at the point shown, what kind of energy does he have at his highest point as shown? Friction is off. A. Kinetic B. Potential C. Thermal D.Kinetic and Potential E. None Energy Form At the second blue dot, what kind of energy does he have? A. Kinetic B. Potential C. Thermal D.Kinetic and Potential E. He won’t get there. Energy Form At the third blue dot, what kind of energy does he have? A. Kinetic B. Potential C. Thermal D.Kinetic and Potential E. He won’t get there. Energy Form At the fourth blue dot, what kind of energy does he have? A. Kinetic B. Potential C. Thermal D.Kinetic and Potential E. He won’t get there. Energy Form At the fifth blue dot, what kind of energy does he have? A. Kinetic B. Potential C. Thermal D.Kinetic and Potential E. He won’t get there. Watch the pie chart to see how energy exchanges between potential and kinetic. Which has more potential energy? A A. box A B. box B C. Equal B What kind of energy will I give box B if I put it on the chair? A A. Electrical B. Kinetic C. Potential D.Both E. None B What about while I’m moving it? What kind of energy does it have? A B A. Electrical B. Kinetic C. Potential D.Both potential and kinetic E. None Let’s say I toss it up to the chair. What kind of energy does it have at point a? B • b A • c •a A. Electrical B. Kinetic C. Potential D.None Let’s say I toss it up to the chair. What kind of energy does it have at point b? B • b A • c •a A. Electrical B. Kinetic C. Potential D.None Let’s say I toss it up to the chair. What kind of energy does it have at point c? B • b A • c •a A. Electrical B. Kinetic C. Potential D.None Energy Flow Worksheet Energy Flow