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ENERGY Energy is the ability to cause change WHAT IS LIGHT ENERGY? WHAT IS THERMAL ENERGY? 5 POINTS 5 POINTS WHAT IS CHEMICAL ENERGY? WHAT IS ELECTRICAL ENERGY? 5 POINTS 5 POINTS ANSWERS Light Energy – radiant energy. Travels at a speed of 300,000 km/s Thermal Energy – energy due to molecular movement within an object. Increased temperature = increased thermal energy Chemical Energy – Electrical Energy – energy stored in chemical energy of electrons bonds. When chemicals are moving along a path broken apart and new (electrical current) molecules are formed, energy is released Energy is the ability to cause change WHAT IS NUCLEAR ENERGY? WHAT IS POTENTIAL ENERGY? 5 POINTS 5 POINTS WHAT IS KINETIC ENERGY? HOW IS NUCLEAR ENERGY RELEASED? 5 POINTS 5 POINTS ANSWERS Nuclear Energy – energy stored in the nucleus of an atom Potential Energy – energy an object has because of its position Kinetic Energy – Nuclear Fission – as energy of a motion. Only soon as the nucleus splits into 2 lighter atoms and throws off a moving object has 2-3 new neutrons. The 2 new kinetic energy. Amount neutrons then emit gamma radiation and the ejected of energy depends on neutrons hit other uranium speed and mass nuclei causing a chain reaction Energy is the ability to cause change HOW DO ENERGY TRANSFORMATIONS OCCUR? HOW DOES MASS AND SPEED OF AN OBJECT RELATE TO KINETIC ENERGY? 10 POINTS 10 POINTS ANSWERS The amount of kinetic energy also depends on the mass and the speed of an object. Energy transformations occur in Kinetic energy increases as energy production (as in conversions of energy for use in speed increases. The faster an object everyday life). moves, the more kinetic energy it has. Potential Energy is the energy An energy transformation occurs when energy changes from one form to another. that is stored because of an object’s position. The energy of an object due to its motion is called Kinetic Energy. Windmill farms are becoming a popular method of generating electricity for some communities. What form of energy in wind is used to turn the giant blades of the windmill? A. Chemical B. Mechanical C. Electrical D. Thermal 20 POINTS The correct answer is B, Mechanical Energy. Wind, which turns the windmill blades, is the movement of air particles. In a nuclear reactor, the energy used to turn water into steam is in what form? A. Chemical B. Nuclear C. Electrical D. Thermal 20 POINTS The correct answer is “D”, thermal energy. The nucleus of the uranium atom contains nuclear energy, but this is converted into thermal energy when the nucleus is split. The thermal energy is then used to heat the water to the boiling point. Nutrients entering muscle cells in the body are converted into heat. What form of energy is stored in the nutrients? A. Chemical B. Nuclear C. Electrical D. Thermal 20 POINTS The correct answer is “A”, chemical energy. Chemical energy is stored in the chemical bonds of the food molecules. QUESTION The boulder would have the greatest kinetic energy at which of the positions on the waterfall? A position 1 A 1 B position 2 C position 3 4 2 D position 4 3 B 20 POINTS B position 2 A yo-yo can demonstrate both Potential and Kinetic energy. When does a yo-yo have it greatest potential energy? A In the hand before the yo-yo is released B At the bottom of the string C When the yo-yo is falling D When the yo-yo is climbing the string 20 POINTS A In the hand before the yo-yo is released. Which will have the most kinetic energy rolling down the hill? A Truck B Ball C Runner D All of the are examples of Potential energy. 20 POINTS Answer: A Which of the following can be used to transform chemical energy into heat energy? A. B. melting a candle lighting a match C. solar panels D. a light bulb 20 POINTS Answer: B Which of these types of energy conversions occurs in a battery-powered flashlight? A. Thermal to mechanical B. Light to electrical C. Thermal to chemical D. Chemical to electrical 20 POINTS Answer: D