SIZE. Energy. Non-Mechanical Energy. Mechanical Energy. Part II. Examples of Non-Mechanical Energy. Examples of Mechanical Energy.

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1 Energy Part II Non-Mechanical Energy Wait a minute if all energy is either kinetic or potential and TME = KE + PE then how can there possibly be such thing as non-mechanical energy!?!? Mechanical Energy versus Non-Mechanical Energy the difference between them is all about SIZE and SCALE Non-Mechanical Energy is the energy of particles or objects that are too small to be seen The energy of extremely small particles is not considered mechanical energy. Examples: atoms, molecules, electrons, photons, protons, quarks, etc. But even the energy of these small particles can be described as either kinetic or potential. Examples of Mechanical Energy Examples of Non-Mechanical Energy 1

2 Non-Mechanical Energy Here are the other types of energy you should be able to recognize which are usually considered non-mechanical : THERMAL ENERGY ACOUSTIC ENERGY CHEMICAL ENERGY NUCLEAR ENERGY ELECTRICAL ENERGY RADIANT ENERGY Thermal Energy (Heat) = the kinetic energy of atoms or molecules Remember, heat is a form of kinetic energy the faster the molecules move, the more heat energy is produced. Thermal Energy (Heat) Thermal Energy (Heat) = the kinetic energy of atoms or molecules A hot object is one whose atoms and molecules are excited and show rapid movement. A cooler object's molecules and atoms will show less movement. Often, we say the mechanical energy of a system is lost to friction ; but the energy is still there -- it has just been converted into heat. Acoustic Energy (Sound) = the kinetic energy of mechanical waves which are audible the by human ear (a mechanical wave is a disturbance pattern in a medium; in this case in the pressure and density of particles of air) Chemical Energy = the energy stored in chemical bonds A form of potential energy, because it is stored, and because it has to do wwith the relative position of particles. Examples: Digesting food bonds are broken to release energy for your body to store and use. Sports your body uses energy stored in your muscles obtained from food. Fire a a chemical change. Sodium metal reacts with water. 2

3 Examples of Chemical Energy Nuclear Energy = the energy stored in the nucleus of an atom. When the nucleus of an atom splits, nuclear energy is transformed to thermal energy. Nuclear energy is the most concentrated form of energy. Fission/fusion Electrical Energy = the energy of electrons (can be kinetic or potential) Moving electrons have kinetic energy, stationary electrons have potential energy. Electrical Potential Energy is called VOLTAGE. Examples: Power lines carry electricity Electric motors are driven by electromagnetic energy Radiant Energy (Light) = the energy of electromagnetic waves Electromagnetic waves are not waves in matter like sound is; they can travel through a vacuum. May be visible or invisible. (UV, radio, ɣ) Aka radiation A B Energy 1. What is the velocity of the coaster when it is at point A? 2. What is the KE of the coaster when it is at point A? 3. What is the height of the coaster when it is at point B? 4. What is the PE of the coaster when it is at point B? Part II 3

4 Energy Transformations and Conservation Energy Transformations What does flowing water have to do with electricity? You may already know that the mechanical energy of moving water can be transformed into electrical energy. Most forms of energy can be transformed into other forms. A change from one form of energy to another is called an energy transformation. Some energy changes involve single transformations, while others involve many transformations. Single Transformations Sometimes, one form of energy needs to be transformed into another to get work done. You are already familiar with many such energy transformations. For example, a toaster transforms electrical energy to thermal energy to toast your bread. A cell phone transforms electrical energy to electromagnetic energy that travels to other phones. Your body transforms the chemical energy in your food to mechanical energy you need to move your muscles. Chemical energy in food is also transformed to the thermal energy your body uses to maintain its temperature. Figure 10:Common Energy Transformations Every day, energy transformations are all around you. Some of these transformations happen inside you! Multiple Transformations Often, a series of energy transformations is needed to do work. For example, the mechanical energy used to strike a match is transformed first to thermal energy. The thermal energy causes the particles in the match to release stored chemical energy, which is transformed to thermal energy and the electromagnetic energy you see as light. 4

5 In a car engine, another series of energy conversions occurs. Electrical energy produces a spark. The thermal energy of the spark releases chemical energy in the fuel. The fuel s s chemical energy in turn becomes thermal energy. Thermal energy is converted to mechanical energy used to move the car, and to electrical energy to produce more sparks. Transformations Between Potential and Kinetic Energy One of the most common energy transformations is the transformation between potential energy and kinetic energy. In waterfalls such as Niagara Falls, potential energy is transformed to kinetic energy. The water at the top of the falls has gravitational potential energy. As the water plunges, its velocity increases. Its potential energy becomes kinetic energy. Energy Transformation in Juggling Any object that rises or falls experiences a change in its kinetic and gravitational potential energy. Look at the orange in Figure 11. When it moves, the orange has kinetic energy. As it rises, it slows down. Its potential energy increases as its kinetic energy decreases. At the highest point in its path, it stops moving. Since there is no motion, the orange no longer has kinetic energy. But it does have potential energy. As the orange falls, the energy transformation is reversed. Kinetic energy increases while potential energy decreases. Energy Transformation in a Pendulum In a pendulum, a continuous transformation between kinetic and potential energy takes place. At the highest point in its swing, the pendulum in Figure 12 has no movement, so it only has gravitational potential energy. As it swings downward, it speeds up. Its potential energy is transformed to kinetic energy. The pendulum is at its greatest speed at the bottom of its swing. There, all its energy is kinetic energy. As the pendulum swings to the other side, its height increases. The pendulum regains gravitational potential energy and loses kinetic energy. At the top of its swing, it comes to a stop again. And so the pattern of energy transformation continues. 5

6 Energy Transformation in a Pole Vault A pole-vaulter transforms kinetic energy to elastic potential energy, which then becomes gravitational potential energy. The pole-vaulter you see in Figure 13 has kinetic energy as he runs forward. When the pole-vaulter plants the pole to jump, his velocity decreases and the pole bends. His kinetic energy is transformed to elastic potential energy in the pole. As the pole straightens out, the pole-vaulter is lifted high into the air. The elastic potential energy of the pole is transformed to the gravitational potential energy of the pole-vaulter. Once he is over the bar, the pole-vaulter vaulter s s gravitational potential energy is transformed back into kinetic energy as he falls toward the safety cushion. Conservation of Energy If you set a spinning top in motion, will the top remain in motion forever? No, it will not. Then what happens to its energy? Is the energy destroyed? Again, the answer is no. The law of conservation of energy states that when one form of energy is transformed to another, no energy is destroyed in the process. According to the law of conservation of energy, energy cannot be created or destroyed. So the total amount of energy is the same before and after any transformation. If you add up all the new forms of energy after a transformation, all of the original energy will be accounted for. Energy and Friction So what happens to the energy of the top in Figure 14? As the top spins, it encounters friction with the floor and friction from the air. Whenever a moving object experiences friction, some of its kinetic energy is transformed into thermal energy. So, the mechanical energy of the spinning top is transformed to thermal energy. The top slows and eventually falls on its side, but its energy is not destroyed it is transformed. The fact that friction transforms mechanical energy to thermal energy should not surprise you. After all, you take advantage of such thermal energy when you rub your cold hands together to warm them up. The fact that friction transforms mechanical energy to thermal energy explains why no machine is 100 percent efficient. You may recall that the output work of any real machine is always less than the input work. This reduced efficiency occurs because some mechanical energy is always transformed into thermal energy due to friction. 6

7 Energy and Matter You might have heard of Albert Einstein s s theory of relativity. His theory stated that energy can sometimes be created by destroying matter! Matter is anything that has mass and takes up space. All objects are made up of matter. Just as one form of energy can be transformed to other forms, Einstein discovered that matter can be transformed to energy. In fact, destroying just a small amount of matter releases a huge amount of energy. Einstein s s discovery meant that the law of conservation of energy had to be adjusted. In some situations, energy alone is not conserved. However, since matter can be transformed to energy, scientists say matter and energy together are always conserved. Einstein published his theory of special relativity in QUIZ TIME! What type of energy cooks food in a microwave oven? ELECTROMAGNETIC ENERGY What type of energy is the spinning plate inside of a microwave oven? MECHANICAL ENERGY QUIZ TIME! Electrical energy is transported to your house through power lines. When you plug an electric fan to a power outlet, electrical energy is transform into what type of energy? MECHANICAL ENERGY QUIZ TIME! What types of energy are shown below? What energy transformation occurs when an electric lamp is turned on? ELECTRICAL ENERGY ELECTROMAGNETIC ENERGY Mechanical and Thermal Energy (Don t t forget friction) 7

8 What type of energy is shown below? What types of energy are shown below? Chemical Energy Electrical, Mechanical and Electromagnetic Energy What type of energy is shown below? What type of energy is shown below? Chemical Energy (yummy) Thermal Energy Energy Transfer Draw a flow map showing the flow of energy transformations in a car from starting vehicle to driving. You should have 5 different types of energy. Electrical Electrical Thermal Mechanical Sound (mechanical) Chemical Electrical Light (Electromagnetic) 8

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1. A release of energy is a sign that A. a physical change gust occurred B. a chemical change is taking place 5. The substance that is formed in a chemical reaction is called the A. reactant B. product

Gravitational Potential Energy

Gravitational Potential Energy Consider a ball falling from a height of y 0 =h to the floor at height y=0. A net force of gravity has been acting on the ball as it drops. So the total work done on the