7.1 Stanford Notes Energy Name
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1 7.1 Stanford Notes Energy Name MAIN POINTS: Write a summary of the main point of each paragraph. Page 164 Questions: Questions you should be able to answer after reading. Energy can cause what? The unit of force is what? The unit of distance is what? 4) The unit of energy is what? 5) Energy can exist in many different. Energy: Joule: Page 165 It takes energy to buy what? List two forms of mechanical energy. and. Where does chemical energy come from? 4) A fossil fuel is a good example of this kind of energy: 5) What has more energy, a balloon that has been filled or one that is empty? 4) 6) What type of energy does the filled balloon have? 5) Mechanical Energy: Chemical Energy:
2 p. 166 Does a rubber band have more or less elastic energy when it is stretched? Name a form of energy that is part of the electromagnetic spectrum. What energy is stored in the nuclei of atoms? 4) What is the name of energy carried by Electromagnetic Waves? 5) What waves in the Electromagnetic Spectrum have the most energy? 6) What waves in the Electromagnetic Spectrum has the least energy? Nuclear Energy: Radiant Energy: p. 167 What provides and has always provided most of Earth s energy for living things and technology? When things fall they gain energy. Where does this energy come from? We say energy is transformed when what happens? 4) Which of the following is equivalent to 2 joules? a. 2 newtons b. 2 kg-m2/s2 c. 2 kilograms d. 2 meters
3 p. 168 What does energy give objects the ability to do? How are work and energy related? The phrase potential energy is another way of saying energy. 4) What is required to do work? 4) 5) When you do work, where does this energy go? p. 169 Do a stretched spring and a box on a high shelf both have potential energy? Why or why not? Explain your answer. Potential energy is energy due to. What is the equation for gravitational potential energy: 4) How much gravitational potential energy does a 20kg box have that is held 2 meters above the ground? Potential Energy:
4 p. 170 Energy that is due to motion is called. Imagine you are holding an apple. i. Does this apple have energy? What type (name at least 2 different types)? ii. How could you increase the potential energy of this apple? iii. How could you increase the kinetic energy of this apple? What is the equation for gravitational potential energy: 4) What is the kinetic energy of a 10kg rock that is moving at 5m/s? 4) Kinetic Energy: Pg 171 A 2kg rock is at the edge of a cliff 20meters above a lake. The rock becomes loose and falls toward the water below. Calculate its potential and kinetic energy when it is at the top and when it is halfway down. Its speed is 14m/s halfway down. Calculate the potential energy of a 4kilogram cat crouched 3 meters off of the ground. Calculate the kinetic energy of a 4kilogram cat running at 5m/s.
5 Additional Questions 1. Which of these graphs illustrates the relationship between speed and the amount of kinetic energy for a 1-kilogram object? 2. Potential energy and kinetic are types of this kind of energy: 3. Identify at least one for of energy that is involved in these situations: e. An ocean wave at the beach knocks over a sand castle. f. Your houseplant grows better when it is placed in sunlight. g. When you eat breakfast in the morning, you have more energy for your school day. h. When you drop a plate it breaks into pieces. i. Your hair dryer works when you plug it into an electrical outlet. 4. In the chapter, you learned that you can increase the pressure energy of a tire by blowing it up. Give another example of an object that has pressure energy. 5. Fill in the table based on your understanding of potential and kinetic energy: 6. Calculate the potential energy of a bird sitting on a tree limb. The mass of the bird is 0.1 kilogram and it is 5 meters off the ground.
6 7. How high is a 0.1-kilogram bird from the ground when its potential energy is 3 joules? 8. What is the kinetic energy of a 2,000 kg car that is traveling 10 m/s? 9. A book on a 2-meter high shelf has 20 joules of potential energy. What is the mass of this book? 10. A 1-kilogram ball has 8 joules of kinetic energy. What is its speed? 11. If the speed of a ball increased from 1 m/s to 4 m/s, by how much would kinetic energy increase? 12. What is the minimum energy required to lift an object weighing 200 newtons to a height of 20 meters?
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