Chapter Seven: Energy
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1 ENERGY
2 Chapter Seven: Energy Ø 7.1 Energy and Systems Ø 7.2 Conservation of Energy Ø 7.3 Energy Transformations
3 Chapter 7.1 Learning Goals Ø Define energy as a description of an object s ability to change or cause change. Ø Discuss examples of different forms of energy. Ø Distinguish potential and kinetic energy and apply formulas to solve problems.
4 Investigation 7A Energy in a System Ø Key Question: How is energy related to motion?
5 7.1 What is energy? Ø Energy measures the ability for things to change themselves or to cause change in other things. Ø Some examples are changes in temperature, speed, position, pressure, or any other physical variable.
6 7.1 Units of energy Ø Pushing a 1-kilogram object with a force of one newton for a distance of one meter uses one joule of energy. Ø A joule (J) is the S.I. unit of measurement for energy.
7 7.1 Joules Ø One joule is a pretty small amount of energy. Ø An ordinary 100 watt electric light bulb uses 100 joules of energy every second!
8 7.1 Some forms of energy Ø Ø Mechanical energy is the energy possessed by an object due to its motion or its position. Potential energy and kinetic energy are both forms of mechanical energy.
9 7.1 Some forms of energy Ø Ø Chemical energy is a form of energy stored in molecules. Batteries are storage devices for chemical energy.
10 7.1 Some forms of energy Ø Electrical energy comes from electric charge, which is one of the fundamental properties of all matter.
11 7.1 More forms of energy Ø Ø Nuclear energy is a form of energy stored in the nuclei of atoms. In the Sun, nuclear energy is transformed to heat that eventually escapes the sun as radiant energy.
12 7.1 More forms of energy Ø Radiant energy is energy that is carried by electromagnetic waves. Ø Light is one form of radiant energy.
13 7.1 More forms of energy Ø The electromagnetic spectrum includes visible light infrared radiation (heat), and ultraviolet light. Ø Light energy and heat energy are included in the electromagnetic spectrum.
14
15 7.1 Sources of energy Ø Without the Sun s energy, Earth would be a cold icy place with a temperature of -273 C. Ø As well as warming the planet, the Sun s energy drives the entire food chain.
16 7.1 Sources of energy Ø Ø All objects with mass feel forces in the presence of Earth s gravity. These forces are a source of energy for objects or moving matter such as falling rocks and falling water.
17 7.1 Energy and work Ø In physics, the word work has a very specific meaning. Ø Work is the transfer of energy that results from applying a force over a distance.
18
19 7.1 Potential energy Ø Systems or objects with potential energy are able to exert forces (exchange energy) as they change. Ø Potential energy is energy due to position.
20 7.1 Potential Energy mass of object (g) PE (joules) E P = mgh height object raised (m) gravity (9.8 m/sec 2 )
21 7.1 Kinetic energy Ø Ø Energy of motion is called kinetic energy. A moving cart has kinetic energy because it can hit another object (like clay) and cause change.
22 7.1 Kinetic Energy KE (joules) mass of object (kg) E K = ½ mv 2 velocity (m/sec)
23
24 Solving Problems Ø Ø Ø Ø A 2 kg rock is at the edge of a cliff 20 meters above a lake. It 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 14 m/s at the halfway point.
25 1. Looking for: Ø initial E K, E P and E K, E P half way down. 2. Given: Ø mass = 2.0 kg; h = 20 m Ø v = 14 m/s (half way) 3. Relationships: Solving Problems Ø E P =mgh Ø E K = ½ mv 2 Ø Assume rock starts from rest.
26 Solving Problems 4. Solution Ø Draw a free body diagram.! E P = (2 kg)(9.8 N/kg)(20 m) = 392 J at top m = 20 kg h = 20 m E P = mgh E K = 0 J! E P = (2 kg)(9.8 N/kg)(10 m) = 196 J half way! E K = 0 J, rock is at rest h = 10 m E P = mgh E K = ½ mv 2! E K = (1/2)(2 kg)(14 m/s) 2 = 196 J half way
27 Chapter Seven: Energy Ø 7.1 Energy and Systems Ø 7.2 Conservation of Energy Ø 7.3 Energy Transformations
28 Chapter 7.2 Learning Goals Ø Describe how energy changes as systems change. Ø Discuss examples of energy transformations. Ø Explore the energy involved in carrying out daily activities.
29 7.2 Conservation of Energy Ø Ø Systems change as energy flows and changes from one part of the system to another. Each change transfers energy or transforms energy from one form to another.
30
31 7.2 Energy flow Ø How can we predict how energy will flow? Ø One thing we can always be sure of is that systems tend to move from higher to lower energy.
32 7.2 Flow of Energy
33 7.2 Sources of energy Ø The chemical potential energy stored in the food you eat is converted into simple sugars that are burned as your muscles work against gravity as you climb the hill.
34 Ø 7.2 Units of energy Some units of energy that are more appropriate for everyday use are the kilowatt hour (kwh), food Calorie, and British thermal unit.
35
36 Chapter Seven: Energy Ø 7.1 Energy and Systems Ø 7.2 Conservation of Energy Ø 7.3 Energy Transformations
37 Chapter 7.3 Learning Goals Ø Explain what it means when energy is conserved. Ø Use energy conservation to solve problems. Ø Discuss applications of energy conservation in daily living.
38 Investigation 7B Conservation of Energy Ø Key Question: What limits how much a system may change?
39 7.3 Conservation of Energy Ø The idea that energy tranforms from one form into another without a change in the total amount is called the law of conservation of energy. Ø The law of energy conservation says the total energy before the change equals the total energy after it.
40 7.3 Conservation of Energy Ø When you throw a ball in the air, the energy transforms from kinetic to potential and then back to kinetic.
41
42 Solving Problems Ø A 2 kg car moving with a speed of 2 m/sec starts up a hill. Ø How high does the car roll before it stops?
43 1. Looking for: Ø height of hill 2. Given Ø mass = 2 kg, v = 2 m/s 3. Relationships: Solving Problems Ø Energy transformed from E K to E P Ø E K = ½ mv 2 Ø E P =mgh
44 Solving Problems 1. Solution Ø Find beginning E K Ø E K = ½ (2 kg) (2 m/s) 2 = 4 Joules Ø Assume energy before = energy after Ø E K = E P Ø E P =mgh 4 J = mgh Ø h = (4 N m)/(2 kg)(9.8 N/kg) =.2 m
45 7.3 Conservation of Energy Ø Ø Many people are concerned about running out of energy. What they worry about is running out of certain forms of energy that are easy to use, such as fossil fuels like oil and gas.
46 7.3 Conservation of Energy Ø Ø It took millions of years to accumulate these fuels because they are derived from decaying, ancient plants that obtained their energy from the Sun when they were alive. Because it took a long time for these plants to grow, decay, and become oil and gas, fossil fuels are a limited resource.
47 7.3 Conservation of Energy Ø Regular (incandescent) light bulbs convert only 10% of electrical energy to light. Ø That means 90% of the energy is released as wasted heat.
48 7.3 Conservation of Energy Ø Other forms of energy, such as thermal energy, flowing water, wind, and solar energy are not as limited.
49
50 Investigation 7C Energy and Efficiency Ø Key Question: How well is energy changed from one form to another?
51 A Matter of Survival Ø In 2005, the U.S. Defense Advanced Research Projects Agency (DARPA) launched its VHESC. program. Ø The goal of the program is to develop solar cells that would operate at or above 50 percent efficiency.
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