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

动能指运动状态物质做功并做出改变的能力
 
 生物系统以不同的方式运动，
 
 如微小的光粒子生产食物，
 
 或跑向食物的动物，
 
 或吸引附近的捕食者的飘散分子

Kohn、Kathryn P.、Sonia M. Underwood 和 Melanie M. Cooper。"化学和生物学中的能源连接和错误连接。"CBE 生命科学教育 17，第 1 期（2018 年）。[<a href="https://doi.org/10.1187/cbe.17-08-0169" target="__blank">来源</a>]

动能

动能是运动中的物体做功或变化的能力。它可以有多种形式。例如，从瀑布中流下的水具有动能。在生物系统中，光粒子传播并被植物吸收以产生化学能。动物消耗化学能量，并释放分子，通过空气携带气味。它们在躲避捕食者时也能产生动能。整个系统也具有动能，就像太阳系，整个行星和恒星的运动都发生在那里。

<h4>动能</h4>
 
 动能是运动物体的能量。例如，当水坝后面的水有势能时，快速流过瀑布的水有动能。如果在瀑布的底部，水停止流动并汇集起来，它的能量将再次转换成势能。
 
 在生物系统中，当物体以不同的方式运动时，动能以不同的形式存在。例如，植物吸收光的粒子来生长和制造食物、快速移动、改变形状并利用它们来工作，它们被用来制造碳水化合物形式的化学能。
 
 动能允许携带动物气味的分子漂移并吸引附近的捕食者。当动物消耗植物的化学能时，动物就可以逃离捕食者，这也是一种动能。
 
 动能也可以从一个物体传递到另一个物体。例如，一个打台球的人可以打一个主球，然后它的动能打另一个球并使它运动。整个系统也可以拥有动能，太阳系中所有行星和恒星的运动都是动能。

动能是运动物体做功或引起变化的能力。它可以表现为多种形式。例如，瀑布中向下流动的水……

Education

教育

JoVE Core

Biology

生物学

Cellular Processes

细胞结构与功能

Metabolism

新陈代谢

KEY TERMS AND CONCEPTS

关键术语与概念

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

JoVE Core系列通过300多节动画视频课简明易懂地讲解生物学中的关键概念，以及150余段视频展示科学家在现代实验室开展实际研究实验，让生物学变得平易近人。

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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 ...

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9-12.PS.1.1.a

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9-12.PS.1.1.b

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9-12.PS.1.1.c

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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 ...

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Collisions in Multiple Dimensions: Problem Solving

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9-12.PS.1.1.d

Motion as a Source of Energy

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