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Oct 24 1. What two Factors determine how much potential energy an object has? 2. Which of the following has the most kinetic energy? sunny windowsill A bicycle parked at the top of a hill A fallen leaf laying on the ground A ball rolling across the floor 3. The energy stored in the nucleus of an atom is what form of energy? 4. What two factors determine an objects's kinetic energy? 5. Which form of energy is transmitted by vibrations of air? 6. When energy is converted from one form to another, what is usually produced? Chemical energy gravity heat nuclear energy Use this link for the work sheet or go to middle school, school staff, my name, and link http://www.classzone.com/books/ml_science_share/vis_sim/ mem05_pg69_potential/mem05_pg69_potential.html Potential and Kinetic energy classzone Explore: How can a can of paint have energy and how that energy can be converted. 1) Shade in the potential energy graph the painter has with the small blue can of paint in picture 1. . Picture 1 Picture 2 2) Shade in the potential energy graph the painter has with the big red can of paint in picture 2. 3) Shade in the potential energy graph the painter has with the small blue can of paint in picture.3. On the ladder. Picture 3 Picture 4 4) Shade in the potential energy graph the painter has with the big red can of paint in picture 4, on the ladder. 5) List two ways we changed the potential energy? 6) When the painter drops the cans what happens to the potential energy graph? 7) When the painter drops the cans what happens to the kinetic energy? 8) How do the changes in question 5 affect the kinetic energy? Forms of Energy Need to Learn ü How can you determine an object’s mechanical energy? ü What are the two basic kinds of energy? ü How are energy, work, and power related ü What are some forms of energy associated with the particles that make up objects? There are many different forms of energy. Mechanical energy is the energy associated with the motion or position of an object. Mechanical energy can be kinetic or potential energy. You can find an object’s mechanical energy by adding the object’s kinetic and potential energy. Mechanical energy = Potential energy + kinetic energy Work is done when a force moves an object through a distance. The ability to do work or cause change is called energy. Energy is measured in a unit called joules. When an object or organism does work on an object, some of its energy is transferred to that object. If the transfer of energy is work, then power is the rate at which energy is transferred, or the amount of energy transferred in a unit of time. Power = Energy transferred Time Two basic kinds of energy are kinetic and potential energy. The energy of motion is called Kinetic energy. The more work you do on an object, the more energy you give that object. The more mass a moving object has, the more kinetic energy it has. Kinetic energy also increases when velocity increases. Kinetic energy= ½ x Mass x velocity2 ( Continued on the Next page) Energy that is stored and held inn readiness is called potential energy. When you raise a book you give the object potential energy. Potential energy that depends on height is gravitational potential energy. Gravitational potential energy = weight x Height When you stretch an object, you give it a different kind of potential energy. The potential energy associated with objects that can be stretched or compressed is called elastic potential energy Forms of energy associated with the particles of objects include thermal energy, electrical energy, chemical energy, electromagnetic energy, and nuclear energy. Thermal energy is the total potential and kinetic energy of particles in an object. When the thermal energy of an object increases, the object becomes warmer. Chemical energy is stored in chemical compounds. Chemical energy is potential energy stored in chemical bonds that hold chemical compounds together. Moving electrical charges produce electricity, and the energy they carry is called electrical energy. Nuclear energy is potential energy stored in the nucleus of an atom. Electromagnetic energy, such as light, travels in waves that have some electrical properties and some magnetic properties. Because waves move, they have kinetic energy. 1. What two forms of energy are associated with mechanical energy? 2. How would you calculate an object’s mechanical energy? 3. If thermal energy is increased, what happens to the movement of particles? 4. What kind of energy is stored in the bonds in compounds of the food you eat? 5. What kind of energy is stored in the nucleus of an atom? 6. Riding a bicycle would be what form of energy? 7. What kind of energy is released from the flow of charged particles? 8. The ability to do work or cause change is called__________ 9. Why can work be thought of as a transfer of energy? 10. What are the two basic kinds of energy? 11. How are work and energy related? 12. The kinetic energy of an object depends on its _______ And its ________ 13. What is the relationship between velocity and kinetic energy? 14. What formula do you use to calculate Kinetic energy? 15. What formula do you use to calculate the gravitational potential energy of an object? 16. What is potential energy called that depends on height? 17. What is potential energy called that is associated with objects that can be stretched? Vocabulary write the word ____________ 18 energy that depends on height ____________19 ability to do work or cause change ____________20 __________21 ____________22 energy associated with objects that Can be stretched or compressed an object’s energy due to its motion any type of stored energy