[FREE] Energy Concepts Answers
It gets hot! Well, that is an example of electrical energy changing into heat energy from the vibration of the filament, as well as producing light! Now, let's think about a gas-fueled electricity plant. A power plant produces electricity by...
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Kinetic and Potential Energy Concepts
Finally, the generator produces electricity. This steam-based technology was first discovered in the early s when engineers began to figure out ways to use the energy in steam released by boiling water. They developed engines that converted steam energy into mechanical energy for use in farm and factory machinery, and later for trains and cars. Historians often cite the development of the steam engine as the start of a period in modern history called the industrial revolution. We classify energy in two ways. First is potential energy, which is the amount of energy something has stored inside it. Anything can have potential energy. A battery has potential energy stored by a difference in ionic concentration; even you have potential energy, as you sit in your chair. How much potential energy you have depends on a few things, including how high up you are and how big you are. Next is kinetic energy. Kinetic energy is the energy of an object in motion.
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Anything that is moving has kinetic energy. Mechanical objects, such as a clock or a person on a skateboard, have kinetic energy, but so do light, sound, wind and water. Can you see examples of energy around the classroom? Well, today we are going to find some of these examples and learn about how engineers work with different types of energy. Write the following phrases on the board and discuss with the class. What is energy? The ability to do work or cause change. Work is the application of a force through a distance. Ask students for examples, such as moving a box across the room, sweeping, etc. Force can put matter into motion or stop it if it is already moving. Motion is a change in position of an object with time. To do work, energy is needed. From where does energy come? What are different types of energy?
Work & Energy: Concepts Worksheet
Kinetic energy: electrical, light, thermal, solar, sound, wind, hydro Potential energy: chemical, mechanical, nuclear, gravitational How do we use energy? To break down and digest food in our bodies To heat houses and other buildings To illuminate lights To power televisions, phones, games, cars To run computers and appliances Lesson Background and Concepts for Teachers Energy takes many forms. Thermal energy or heat boils water, keeps us warm and drives engines. Chemical energy fuels automobiles and airplanes. Electrical energy drives many small machines and keeps lights glowing. Almost every form of energy can be converted into other forms. But whatever form it is in, energy is essentially the capacity for making something happen or, as engineers and scientists say, "doing work. The energy cycle from the sun to our homes. All rights reserved. Nearly all our energy comes to us ultimately from the sun see Figure 1.
7: Work, Energy, and Energy Resources (Exercises)
We get some energy directly via passive solar lighting and heating, or solar power cells. However, most energy comes indirectly via burning fossil fuels coal, oil and gas , which received their energy from fossilized plants and other organisms. The plants and organisms originally obtained their energy directly from the sun by a process called photosynthesis. Some of these sources of energy are renewable and others nonrenewable or limited in their available quantity. Associated Activities What Is Energy? Short Demos - In three short demonstrations, students learn about some of the forms of energy commonly found around us.
Energy Science Quiz
Energy Detectives at Work - Students become engineering detectives and find examples of energy all around the classroom or school. Lesson Closure Today we started learning about energy and engineering. Can you define and describe the word "energy? Possible answers: Heat, light, sound, movement. Why would an engineer care about energy? Answer: Engineers develop products that use energy. Engineers help develop ways to store energy for our use.
What is conservation of energy?
Assign students the Energy Vocabulary Quiz to gauge their mastery in understanding the uses of energy in their surroundings and the fundamental types of energy. Many people use biomass energy to heat their homes; they burn wood. Many agricultural crops are also biomass. For instance, corn can be fermented to produce ethanol that is burned as a liquid fuel. Wood is a renewable energy source as long as cut trees are replaced immediately. Chemical energy holds molecules together and keeps them from moving apart. For example, a car engine uses chemical energy stored in gasoline, and moving people use chemical energy from food. Television sets, computers and refrigerators use electrical energy. For example, a spinning top, a falling object and a rolling ball all have kinetic energy.
Energy Concepts - Answers 1. Explain how energy and work are
The motion, if resisted by a force, does work. Wind and water both have kinetic energy. Others forms include infrared and ultraviolet light. It is the sum of an object's kinetic and potential energy. Sources include oil petroleum , natural gas, coal and uranium nuclear. Some power companies that supply homes, schools and buildings with electricity use nuclear energy to generate electricity.
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A roller coaster at the top of a hill has potential energy. Sources include solar, wind, geothermal, biomass, ocean and hydro water. The more heat a substance has, the more rapid the vibration of its molecules. Heat energy flows from places of higher temperature to places of lower temperature. Possible answers: The ability to do work or cause change and the capacity for vigorous activity. Work is the application of a force through a distance [ask for examples]. Answers: Power plants, people, food, light, windmills, turbines, fires, etc. Answers: Chemical, thermal, mechanical, potential, kinetic, solar, sound, nuclear, etc. How do we use energy? Possible answers: Our bodies use energy to break down and digest food.
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Matter And Energy Worksheet Answers
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The first two subtopics explain the scalar product and the notions of work and kinetic energy. Additionally, the first part of Work, Energy and Power includes the work-energy theorem, the concept of kinetic energy, potential energy, conservation of mechanical energy, and much more. NCERT solutions Class 11th Physics Chapter 6 provides you with step-by-step solutions of Mathematical problems and detailed theoretical representation to help you grasp these concepts. NCERT solution of Physics Class 11 Chapter 6 in the next part explains the concept of power and collisions by providing lucid diagrammatic representations.
Teaching Energy Concepts by Working on Themes of Cultural and Environmental Value
But it takes a smart approach in providing you with in-depth theoretical knowledge by incorporating questions that require you to choose the correct alternative. Work, Energy and Power Class 11 NCERT PDF has proved to be extremely helpful for students to prepare for their examinations in a short period by highlighting all essential theories and mathematical problems. Study anywhere and everywhere from your most favoured device. Scoring the highest marks and standing out in class has never been easier. It covers the entire exercise given in your book. All answers are uniquely designed to cover the entire topic, explaining to you all the important concepts along with illustrations when necessary. NCERT solutions for Class 11 Physics Chapter 6 carries all the necessary questions and answers that are based on previous year questions. These are crucial for securing the highest marks from this chapter.
Physics question: energy concepts? | Yahoo Answers
Metrics details Abstract Energy is a central topic in physics and a key concept for understanding the physical, biological and technological worlds. It is a complex topic with multiple connections with different areas of science and with social, environmental and philosophical issues. In this paper we discuss some aspects of the teaching and learning of the energy concept, and report results of research on this issue. We describe the design and evaluation of a teaching learning path developed around the issue of greenhouse effect and global warming. Based on the results of the experimentation and in collaboration with the teachers involved, new materials for the students have been prepared and a new cycle of implementation, evaluation and refinement has been activated with a larger group of teachers and students.
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This type of systematic and long term collaboration with teachers can help to fill the gap between the science education research and the actual school practice. This is a preview of subscription content, access via your institution. Access options Instant access to the full article PDF. Subscribe to journal Immediate online access to all issues from Subscription will auto renew annually.
Kinetic Energy and the Work-Energy Theorem – College Physics
Scientists use the term bioenergetics to describe the concept of energy flow Figure 4. Cellular processes such as the building and breaking down of complex molecules occur through stepwise chemical reactions. Some of these chemical reactions are spontaneous and release energy, whereas others require energy to proceed. Just as living things must continually consume food to replenish their energy supplies, cells must continually produce more energy to replenish that used by the many energy-requiring chemical reactions that constantly take place. Figure 4. Plants use photosynthesis to capture sunlight, and herbivores eat the plants to obtain energy.
Kinetic and Potential Energy of Motion - Lesson - TeachEngineering
Carnivores eat the herbivores, and eventual decomposition of plant and animal material contributes to the nutrient pool. Metabolic Pathways Consider the metabolism of sugar. This is a classic example of one of the many cellular processes that use and produce energy. Living things consume sugars as a major energy source, because sugar molecules have a great deal of energy stored within their bonds. For the most part, photosynthesizing organisms like plants produce these sugars. During photosynthesis, plants use energy originally from sunlight to convert carbon dioxide gas CO2 into sugar molecules like glucose: C6H12O6. They consume carbon dioxide and produce oxygen as a waste product.
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During the light reactions of photosynthesis, energy is provided by a molecule called adenosine triphosphate ATP , which is the primary energy currency of all cells. Just as the dollar is used as currency to buy goods, cells use molecules of ATP as energy currency to perform immediate work. In contrast, energy-storage molecules such as glucose are consumed only to be broken down to use their energy. The reaction that harvests the energy of a sugar molecule in cells requiring oxygen to survive can be summarized by the reverse reaction to photosynthesis.
4.1 Energy and Metabolism
In this reaction, oxygen is consumed and carbon dioxide is released as a waste product. The processes of making and breaking down sugar molecules illustrate two examples of metabolic pathways. A metabolic pathway is a series of chemical reactions that takes a starting molecule and modifies it, step-by-step, through a series of metabolic intermediates, eventually yielding a final product. In the example of sugar metabolism, the first metabolic pathway synthesized sugar from smaller molecules, and the other pathway broke sugar down into smaller molecules. These two opposite processes—the first requiring energy and the second producing energy—are referred to as anabolic pathways building polymers and catabolic pathways breaking down polymers into their monomers , respectively. Consequently, metabolism is composed of synthesis anabolism and degradation catabolism Figure 4.
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It is important to know that the chemical reactions of metabolic pathways do not take place on their own. Each reaction step is facilitated, or catalyzed, by a protein called an enzyme. Enzymes are important for catalyzing all types of biological reactions—those that require energy as well as those that release energy. Anabolic pathways are those that require energy to synthesize larger molecules. Energy Thermodynamics refers to the study of energy and energy transfer involving physical matter.
Energy Concepts
The matter relevant to a particular case of energy transfer is called a system, and everything outside of that matter is called the surroundings. For instance, when heating a pot of water on the stove, the system includes the stove, the pot, and the water. Energy is transferred within the system between the stove, pot, and water. There are two types of systems: open and closed. In an open system, energy can be exchanged with its surroundings. The stovetop system is open because heat can be lost to the air. A closed system cannot exchange energy with its surroundings. Biological organisms are open systems. Energy is exchanged between them and their surroundings as they use energy from the sun to perform photosynthesis or consume energy-storing molecules and release energy to the environment by doing work and releasing heat. Like all things in the physical world, energy is subject to physical laws. The laws of thermodynamics govern the transfer of energy in and among all systems in the universe.
Physics question: energy concepts?
In general, energy is defined as the ability to do work, or to create some kind of change. Energy exists in different forms. For example, electrical energy, light energy, and heat energy are all different types of energy. To appreciate the way energy flows into and out of biological systems, it is important to understand two of the physical laws that govern energy. Thermodynamics The first law of thermodynamics states that the total amount of energy in the universe is constant and conserved. In other words, there has always been, and always will be, exactly the same amount of energy in the universe. Energy exists in many different forms. According to the first law of thermodynamics, energy may be transferred from place to place or transformed into different forms, but it cannot be created or destroyed.
Energy Concepts Question?
The transfers and transformations of energy take place around us all the time. Light bulbs transform electrical energy into light and heat energy. Gas stoves transform chemical energy from natural gas into heat energy. Plants perform one of the most biologically useful energy transformations on earth: that of converting the energy of sunlight to chemical energy stored within organic molecules Figure 4. Some examples of energy transformations are shown in Figure 4. The challenge for all living organisms is to obtain energy from their surroundings in forms that they can transfer or transform into usable energy to do work. Living cells have evolved to meet this challenge. Chemical energy stored within organic molecules such as sugars and fats is transferred and transformed through a series of cellular chemical reactions into energy within molecules of ATP.
NCERT Solutions for Class 11 Physics Chapter 6
Energy in ATP molecules is easily accessible to do work. Examples of the types of work that cells need to do include building complex molecules, transporting materials, powering the motion of cilia or flagella, and contracting muscle fibers to create movement. The food we consume provides our cells with the energy required to carry out bodily functions, just as light energy provides plants with the means to create the chemical energy they need. However, the second law of thermodynamics explains why these tasks are harder than they appear.
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All energy transfers and transformations are never completely efficient. In every energy transfer, some amount of energy is lost in a form that is unusable. In most cases, this form is heat energy. Thermodynamically, heat energy is defined as the energy transferred from one system to another that is not work. For example, when a light bulb is turned on, some of the energy being converted from electrical energy into light energy is lost as heat energy. Likewise, some energy is lost as heat energy during cellular metabolic reactions.
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An important concept in physical systems is that of order and disorder. The more energy that is lost by a system to its surroundings, the less ordered and more random the system is. Scientists refer to the measure of randomness or disorder within a system as entropy. High entropy means high disorder and low energy. Molecules and chemical reactions have varying entropy as well. For example, entropy increases as molecules at a high concentration in one place diffuse and spread out. The second law of thermodynamics says that energy will always be lost as heat in energy transfers or transformations.
Conservation of mechanical energy | Mechanical energy | Siyavula
Living things are highly ordered, requiring constant energy input to be maintained in a state of low entropy. Potential and Kinetic Energy When an object is in motion, there is energy associated with that object. Think of a wrecking ball. Even a slow-moving wrecking ball can do a great deal of damage to other objects. Energy associated with objects in motion is called kinetic energy Figure 4. A speeding bullet, a walking person, and the rapid movement of molecules in the air which produces heat all have kinetic energy. Now what if that same motionless wrecking ball is lifted two stories above ground with a crane? If the suspended wrecking ball is unmoving, is there energy associated with it? The answer is yes. The energy that was required to lift the wrecking ball did not disappear, but is now stored in the wrecking ball by virtue of its position and the force of gravity acting on it. This type of energy is called potential energy Figure 4.
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