Name: motion as a source of energy
Uploaded: 2019-03-11T09:21:09.000Z
Duration: 23 s
Channel: JoVE

K12 Standards

Alabama Course of Study Science

9-12

Physical Science

Energy

9-12.PS.1.1

Kinetic Energy

الطاقة الحركية هي قدرة أي جسم متحرك على القيام بالعمل أو إحداث التغيير. في النظم البيولوجية تتحرك الكائنات بطرق مختلفة مثل جزيئات صغيرة من الضوء تصنع الطعام حيوان يركض نحو وجبته التالية أو جزيئات تطلق بعيدا لجذب الحيوانات المفترسة القريبة.

كون ، كاثرين ب. ، سونيا إم أندروود ، وميلاني إم كوبر. "اتصالات الطاقة وسوء الاتصال عبر الكيمياء وعلم الأحياء." تعليم علوم الحياة بالبنك المركزي المصري 17 ، العدد 1 (2018). [<a href = "https://doi.org/10.1187/cbe.17-08-0169" target = "__blank" >المصدر</a>]

الطاقة الحركية

الطاقة الحركية هي قدرة الجسم المتحرك على القيام بعمل أو إحداث تغيير. يمكن أن تتخذ أشكالا عديدة. على سبيل المثال ، المياه المتدفقة إلى أسفل الشلال لها طاقة حركية. في النظم البيولوجية ، تنتقل جزيئات الضوء ويتم امتصاصها بواسطة النباتات لتوليد الطاقة الكيميائية. تستهلك الحيوانات الطاقة الكيميائية وتطلق جزيئات تحمل رائحتها في الهواء. كما أنها تولد طاقة حركية عندما تهرب من الحيوانات المفترسة. تمتلك الأنظمة بأكملها أيضاً طاقة حركية ، مثل النظام الشمسي ، حيث تحدث حركة الكواكب والنجوم بأكملها.

<h4>الطاقة الحركية</h4>

الطاقة الحركية هي طاقة الأجسام المتحركة. على سبيل المثال ، في حين أن المياه خلف السد لديها طاقة كامنة ، فإن المياه التي تتدفق بسرعة إلى أسفل الشلال لها طاقة حركية. إذا توقف الماء في قاع الشلال عن الحركة وتجمع ، فسيتم تحويل طاقته مرة أخرى إلى طاقة كامنة.

في الأنظمة البيولوجية ، تتخذ الطاقة الحركية أشكالاً مختلفة حيث تتحرك الأشياء بطرق مختلفة. على سبيل المثال ، جزيئات الضوء _ الفوتونات ، التي تمتصها النباتات للنمو وصنع الطعام ، تتحرك بسرعة كبيرة ، وتغير شكلها ، وتُسخَّر للقيام بالعمل _ تُستخدم في إنتاج طاقة كيميائية على شكل كربوهيدرات.

تسمح الطاقة الحركية للجزيئات التي تحمل رائحة الحيوانات بالانحراف بعيداً وجذب حيوان مفترس قريب. الطاقة الكيميائية من النباتات ، عندما تستهلكها الحيوانات ، تسمح للحيوانات بالهروب من مفترسها _ أيضا شكل من أشكال الطاقة الحركية.

يمكن أيضاً أن تنتقل الطاقة الحركية من جسم إلى آخر. على سبيل المثال ، يمكن لأي شخص يلعب البلياردو أن يضرب كرة رئيسية فتضرب طاقتها الحركية كرة أخرى وتحركها. يمكن أن تمتلك الأنظمة بأكملها أيضاً طاقة حركية _ حركة جميع الكواكب والنجوم في نظامنا الشمسي هي طاقة حركية.

الطاقة الحركية هي قدرة كائن متحرك على القيام بعمل أو إحداث تغيير. يمكن أن تتخذ أشكالا عديدة. على سبيل المثال ، المياه المتدفقة أسفل الشلال ...

Education

JoVE Core

Biology

علم الأحياء

Cellular Processes

العمليات الخلوية

Metabolism

عملية التمثيل الغذائي (الأيض)

KEY TERMS AND CONCEPTS

المصطلحات والمفاهيم الأساسية

motion as a source of energy

Kinetic energy is the energy of motion. It appears when an object is moving and can do work or cause change. A waterfall is one clear example. Water behind a dam has potential energy, but when it rushes downward, that moving water has kinetic energy.

When the water reaches the bottom and stops moving, its energy can become potential energy again. Kinetic energy also shows up in living systems. Plants absorb light particles, called photons, which move very fast and help create chemical energy in the form of carbohydrates. In this way, motion can be converted into another useful energy form.

Animals also depend on kinetic energy in different ways. Molecules that carry scent move through the air and can attract a nearby predator. Animals then use the chemical energy they get from plants to run away, which is another example of motion-based energy. Kinetic energy can also move from one object to another, such as when a cue ball hits another ball in pool and sets it in motion.

Even large systems can have kinetic energy. The movement of planets and stars in the solar system is one example. This makes kinetic energy important in nature, in biology, and in every kind of moving system.

Motion as a Source of Energy

what is metabolism?

Metabolism, Energy, and Cell Reactions

Metabolism is the set of chemical reactions that happen in a cell. It includes anabolism, which builds molecules, and catabolism, which breaks them down. These reactions help cells manage energy and keep life processes running. Cells use metabolism to turn food into energy, make cell parts, and remove waste products. Food stores potential energy in the bonds between atoms. Catabolic pathways break large food molecules into smaller ones and release that energy. Anabolic pathways use that energy...

first law of thermodynamics

Energy Flow in a Food Web

Energy flow in a food web shows the First Law of Thermodynamics in action. Energy cannot be created or destroyed. It can only change form as it moves through living things and the environment. Sunlight is the starting point. Plants capture radiant energy from the sun during photosynthesis and turn it into chemical energy stored in complex carbohydrates. At the same time, oxygen is released into the atmosphere. Herbivores eat the plants and use those sugars during digestion. The energy is...

second law of thermodynamics

Entropy in Food Web Energy Flow

The Second Law of Thermodynamics explains why entropy increases as energy moves through a system. Entropy means the amount of disorder in a system. Each time energy is transferred or transformed, some energy is lost as unusable heat. That heat can raise the motion of nearby molecules for a short time and make the surroundings less ordered and more random. This idea also appears in a food web. Primary producers, such as plants, take in energy from the sun and make food. During this process,...

kinetic energy

Kinetic energy is the energy of motion. It appears when an object is moving and can do work or cause change. A waterfall is one clear example. Water behind a dam has potential energy, but when it rushes downward, that moving water has kinetic energy. When the water reaches the bottom and stops moving, its energy can become potential energy again. Kinetic energy also shows up in living systems. Plants absorb light particles, called photons, which move very fast and help create chemical energy...

potential energy

Stored Energy in Motion and Bonds

Stored energy in motion and bonds is called potential energy. It depends on the structure of an object or the position of matter in space. Raising a kettlebell changes its location and increases its potential energy. A stretched rubber band also stores potential energy, which can later change into kinetic energy. Chemical bonds between atoms hold another form of stored energy called chemical energy. These bonds involve attractive forces, and that energy can change into other forms during a...

free energy

Gibbs Free Energy in Chemical Reactions

Gibbs free energy is a measure of useful energy that can be taken from a chemical reaction to do work. It is written as G and named for scientist Gibbs, who discovered it. This energy is what remains after entropy is considered. A reaction can either take in energy or release it. Reactions that absorb energy are called endergonic reactions. Reactions that release energy are called exergonic reactions. The direction of energy flow helps show which type of reaction is happening. Plants carry...

activation energy

How Catalysts Lower Reaction Barriers

Activation energy is the minimum energy a chemical reaction needs to keep going. When the activation energy is higher, the reaction usually happens more slowly. Adding heat can speed the reaction because molecules move faster and collide more often. As reactants collide, bonds break and the reaction moves through an uphill phase. That step creates the transition state, which is an unstable, high-energy state of the reactants. After that, new bonds form, products appear, and free energy is...

hydrolysis of atp

ATP Breakdown and Energy Release

ATP breakdown releases energy for cell work. Adenosine triphosphate, or ATP, can lose one or two phosphate groups when water is added. This hydrolysis reaction is exergonic, which means it releases energy that the cell can use. When one phosphate group is removed, ATP becomes ADP, or adenosine diphosphate. Inorganic phosphate is also released. ADP can then be hydrolyzed again to form AMP, or adenosine monophosphate, after a second phosphate group is removed. ATP has a clear structure. It is...

phosphorylation

Phosphorylation and Protein Control

Phosphorylation helps control how proteins work in cells. It is the addition or removal of phosphate groups, and it is the most common chemical change that regulates cellular processes. These changes can alter a protein’s structure, activity, stability, location inside the cell, and interactions with other proteins. During phosphorylation, protein kinases move the terminal phosphate group from ATP to a specific amino acid side chain on a target protein. The amino acids most often...

induced-fit model

How Enzymes Adjust to Their Substrates

Enzymes speed up many chemical reactions in cells. They are biological catalysts, so they increase reaction speed without being consumed or permanently changed. They do this by lowering the activation energy needed to turn reactants into products. Enzymes are proteins that usually work by binding to a substrate, which is the reactant molecule they act on. They show substrate specificity, meaning they bind only certain substrates. This specificity depends mainly on the shape and chemical...

enzyme kinetics

Substrate Effects on Enzyme Rates

Enzyme kinetics examines how enzymes change the rate of a reaction. Enzymes speed reactions by lowering the activation energy of the reactants. The reaction rate is the speed at which an enzyme turns reactants into products, and it can be affected by several factors, including the number of available reactants. Scientists often study enzyme kinetics in a test tube with a fixed amount of enzyme. When more substrate, or reactant, is added, the reaction rate increases because the enzyme can make...

enzyme inhibition

Competitive vs Noncompetitive Inhibitors

Enzyme inhibitors are molecules that reduce enzyme activity by binding to enzymes. Cells use these inhibitors to help regulate normal enzyme function. Drugs and toxins can also block enzymes and change how they work. Some inhibitors bind at the active site, which is the part of the enzyme where the substrate normally fits. Competitive inhibitors do this by occupying the active site and preventing the substrate from binding. If the substrate concentration becomes high enough, it can outcompete...

feedback inhibition

How Cells Control Product Buildup

Cells use enzymes to run biochemical reactions and make the products they need. These reactions are happening constantly, and enzymes speed them up so they happen fast enough to matter. Enzyme activity also has to be regulated. Cells need the right amounts of starting materials, intermediate metabolites, and final products. If these substances build up too much or drop too low, the cell can be harmed. That is why cells use control systems to keep metabolic levels balanced. One important...

allosteric regulation

Allosteric Control of Enzyme Speed

Allosteric control changes enzyme speed when a molecule binds to a site other than the active site. That alternate binding spot is called an allosteric site. An enzyme can have more than one allosteric site. This type of control can raise or lower enzyme activity. Many enzymes with allosteric control are metabolic enzymes. They help with the breakdown or the building of specific molecules in cells. In allosteric inhibition, the effector molecule causes a shape change that lowers the enzyme's...

cofactors and coenzymes

Enzyme Helpers: Metals, Vitamins, and More

Enzyme helpers are needed for many enzymes to work properly. These helpers fall into two groups: cofactors and coenzymes. Cofactors are metallic ions, while coenzymes are non-protein organic molecules. Both can be tightly bound to an enzyme or attach only when the substrate binds. Cofactors are common in mature proteins, appearing in about 30% of them. They are often added as the enzyme folds and help with catalytic activity. Magnesium is one important cofactor, and it is needed by more than...

key terms and concepts

Explore kinetic energy as motion in waterfalls, light, animal movement, pool collisions, and even the solar system in a clear high school science lesson.

Motion as a Source of Energy | JoVE K12

JoVE Core series brings biology to life through over 300 concise and easy-to-understand animated video lessons that explain key concepts in biology, plus more than 150 scientist-in-action videos that show actual research experiments conducted in today’s laboratories.

biology

myJoVE Corporation

What is Energy?

The universe is composed of matter in different forms, and all forms of matter contain energy. &#xA0;The different forms of energy on Earth originate from ...

Energy Basics

Chemical reactions, such as those that occur when you light a match, involve changes in energy as well as matter.

Chemical changes and their accompanying ...

The universe is composed of matter in different forms, and all forms of matter contain energy.&#160; The different forms of energy on Earth originate from ...

Types of Potential Energy

Potential energy is also known as energy at rest or stored energy. Common types of potential energy include the gravitational potential energy stored in ...

Types of Kinetic Energy

The amount of kinetic energy of an object depends on its mass and speed. Consider two balls of different masses rolling down an inclined plane at the same ...

Work-energy Theorem

According to Newton&#x2019;s second law of motion, the sum of all the forces acting on a particle (net force) determines the rate of change in the ...

Conservation of Mechanical Energy

The mechanical energy E of a system is the sum of its potential energy U and the kinetic energy K of the objects within it. What happens to this ...

/files/media/science-education/science-education-thumbs/14702.jpg

Conservation of Energy

The terms &#39;conserved quantity&#39;&#160;and &#39;conservation law&#39;&#160;have specific scientific meanings in physics, which differ from the ...

Conservation of Energy: Application

When solving problems using the energy conservation law, the object (system) to be studied should first be identified. Often, in applications of energy ...

Energy Diagrams - I

The dynamics of a mechanical system can be easily understood by interpreting a potential energy diagram. Since energy is a scalar quantity, the ...

Energy Diagrams - II

Energy diagrams are important to understand the dynamics of a system. The topology of an energy diagram helps illustrate the equilibrium points of the ...

Kinetic energy is the ability of an object in motion to do work or enact change. It can take on many forms. For instance, water flowing down a waterfall ...

Potential Energy

The energy stored by a structure and location of matter in space is called potential energy. For instance, raising a kettlebell changes its spatial ...

Free Energy

Free energy&mdash;abbreviated as G for the scientist Gibbs who discovered it&mdash;is a measurement of useful energy that can be extracted from a reaction ...

Activation Energy

Activation energy is the minimum amount of energy necessary for a chemical reaction to move forward. The higher the activation energy, the slower the rate ...

What is Photosynthesis?

Photosynthesis is a multipart, biochemical process that occurs in plants as well as in some bacteria. It captures carbon dioxide and solar energy to ...

Light as Energy

The energy required to carry out photosynthesis is light&#8212; typically electromagnetic radiation from the sun. The range of all possible wavelengths is ...

1. Evaluate sources of information concerning the law of conservation of energy to illustrate energy transformations in practical applications and natural systems. Examples: Describe energy transformation when an arrow is fired from a bow. Illustrate how solar energy is transformed into chemical energy and then into mechanical energy which living things use to do work.

Work

Work is done when energy is transferred from one object to another. In other words, work is when a force acts on something that undergoes a displacement ...

Positive, Negative, and Zero Work

Work is done on an object when energy is transferred to the object. In other words, work is done when a force acts on a body that undergoes a displacement ...

Gravitational Potential Energy

Potential energy is not just a property of each object, but also a property of the interactions between objects in a chosen system. For each type of ...

Elastic Potential Energy

Elastic potential energy is the energy stored as a result of the deformation of an elastic object, such as the stretching of a spring. An object is ...

a. Plan and carry out investigations to explore how mechanical energy is transformed within a system, including kinetic energy, gravitational potential energy, elastic potential energy, and work. Examples: Using a digital simulation of a skateboarder moving through a loop, construct energy bar charts and use mathematical expressions to represent the energy changes.

9-12.PS.1.1.a

Mechanisms of Heat Transfer I

Just as interesting as the effects of heat transfer on a system are the methods by which the heat transfer occur. Whenever there is a temperature ...

Mechanisms of Heat Transfer II

In convection, thermal energy is carried by the large-scale flow of matter. Ocean currents and large-scale atmospheric circulation, which result from the ...

conduction-convection-and-radiation-problem-solving

Conduction, Convection and Radiation: Problem Solving

There are three methods by which heat transfer can take place: conduction, convection, and radiation. Each method has unique and interesting ...

b. Collect, analyze, and use data to explain how thermal energy is transferred by conduction, convection, and radiation.

9-12.PS.1.1.b

Quantifying Heat

Thermal Energy&#160;

Microscopically, thermal energy is the kinetic energy associated with the random motion of atoms and molecules. Temperature is a ...

Heat Flow and Specific Heat

Heat is a type of energy transfer that is caused by a temperature difference, and it can change the temperature of an object. Since heat is a form of ...

c. Construct explanations to justify the selection of materials for specific applications based on the materials' specific heat values. Examples: Engineers choose to use ethylene glycol in coolants because of its high specific heat.

9-12.PS.1.1.c

Linear Momentum

The term momentum is used in various ways in everyday language, most of which are consistent with the precise scientific definition. Generally, momentum ...

Force and Momentum

Force and momentum are intimately related. Force acting over time can change momentum, and Newton&#39;s second law of motion can be stated in its most ...

Impulse

According to Newton&#8217;s second law of motion, the rate of change of the momentum of an object is the net external force acting on it. The total change ...

Impulse-Momentum Theorem

The total change in the motion of an object is proportional to the total force vector acting on it and the time over which it acts. This product is called ...

Conservation of Momentum: Introduction

The total momentum of a system consisting of N interacting objects is constant in time or is conserved. A system must meet two requirements for its ...

Conservation of Momentum: Problem Solving

Solving problems using the conservation of momentum requires four basic steps:

	Identify a closed system, where the total mass is constant, and no net ...

Types Of Collisions - I

When two objects come in direct contact with each other, it is called a collision. During a collision, two or more objects exert forces on each other in a ...

Types of Collisions - II

When two or more objects collide with each other, they can stick together to form one single composite object (after collision). The total mass of the ...

Elastic Collisions: Introduction

An elastic collision is one that conserves both internal kinetic energy and momentum. Internal kinetic energy is the sum of the kinetic energies of the ...

Elastic Collisions: Case Study

Elastic collision of a system demands conservation of both momentum and kinetic energy. To solve problems involving one-dimensional elastic collisions ...

collisions-in-multiple-dimensions-introduction

Collisions in Multiple Dimensions: Introduction

It is far more common for collisions to occur in two dimensions; that is, the initial velocity vectors are neither parallel nor antiparallel to each ...

collisions-in-multiple-dimensions-problem-solving

Collisions in Multiple Dimensions: Problem Solving

In multiple dimensions, the conservation of momentum applies in each direction independently. Hence, to solve collisions in multiple dimensions, we should ...

d. Investigate collisions and other real-world situations to evaluate the effects of impulse on changes in momentum. Examples: Explain how an airbag increases the contact time during a collision and therefore reduces the force experienced by a crash test dummy.

9-12.PS.1.1.d

Motion as a Source of Energy

Description

Transcript

More videos by Standards