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Ch. 17: Changing Energy Forms Lesson 1: How can energy change? 1. What unit is used for energy and work? Why is it the same for both? joule doing work transfers energy to the object 2. Define energy. The ability to cause change or to do work 3. Define the following types of energy and give examples of each. a. mechanical Energy an object has because of its movement or position Ex: book on a desk, riding a bike b. kinetic Mechanical energy of a moving object Ex: riding a bike, running, writing c. potential Mechanical energy due to position; stored energy Ex: book on a desk, rock on a ledge, stretched rubber band d. chemical Energy stored in the bonds between atoms Ex: CH4, C6H12O6, gasoline e. nuclear Energy from the nucleus of an atom Ex: uranium f. thermal Energy in the form of heat Ex: stove, heater g. electrical Energy that results from the movement of electrons Ex: outlets, batteries Ch. 17: Changing Energy Forms Lesson 1: How can energy change? 4. A stretched rubber band can be used to move a marble along a desk. Relate the kinetic energy of the marble to the potential energy of the stretched rubber band. When you let go of the rubber band, its potential energy is transferred to the marble and changed to kinetic energy as the marble starts moving. 5. Use a sequence chart to trace the path of energy involved in drinking a glass of orange juice. Nuclear energy (sun) light (space) chemical energy (plant) thermal and kinetic (body) 6. Give some examples of energy doing work in nature. Wind blows down a tree Geothermal makes a geyser Tides wear away rock and sand 7. Give 2 ways that energy can be changed to thermal energy. Friction and burning 8. What energy changes are involved when an electric light shines? Electricity is changed into heat and light 9. What happens to the chemical energy stored in a candle when the candle burns? Chemical energy is changed into heat and light Ch. 17: Changing Energy Forms Lesson 1: How can energy change? 10. Why does a bouncing ball stop bouncing? What happens to its energy? The energy in the ball is changed into thermal energy because of friction with the air and floor. It is also changed into sound. 11. State the law of conservation of mass and energy. The total amount of mass and energy doesn’t change. It only changes forms. 12. What is wrong with the following statement? “Burning gas in a furnace creates energy that can be used to heat your home.” You can’t create energy. It just changes from chemical to heat. 13. What are the energy changes involved in tossing a ball in the air? As the ball is moving it has kinetic energy. It also has potential energy because it is above the ground. As the ball goes up, the potential energy increases and the kinetic decreases until it reaches the highest point. As the ball falls, the potential energy decreases and the kinetic energy increases.