These include very large things, like planets, and very small ones, like atoms. The heavier a thing is, and the faster it moves, the more kinetic energy it has.
What is the Definition of Energy? We use energy to run, to make things happen. I know, all the school books say energy Define photosythesis the ability to do work.
But what does that mean? Well it sort of means the ability to make something happen the nearly-well-known Dave Watson definition.
Everytime a force is exerted on something through a distance which is the definition of work something had to move, which means something happened.
But is that the definition of Energy? My thermo books say work is a process of energy transfer.
Not a single one of my numerous thermodynamics text books says energy is "the ability to do work" see fun definitions below. And what about heat flow? Energy can be transferred through heat flowlike when you put a pot of water on the stove and the water gets hotter.
Something happened for sure. The water got hot and eventually, if left on the hot stove long enough, will start to boil. What forces are involved in this case? There doesn't appear to be anything being pushed through a distance. Some of the more thoughtful text books are careful to explain that the ability to do work applies to mechanical energy, not heat or thermal energy - see the page on types of energy.
But we're not done yet. If you get to the really thoughtful text books or web sites they will explain that what we call heat or heat flow is really the 35, foot view macro level of the result of trillions and trillions and trillions of interactions between atoms and molecules.
At the atomic, or micro level, you can make the case that it looks a lot like work, as individual atomic particles are exchanging energy by doing work on each other again see the page on types of energy. Relevant Digression It's okay to admit we don't have everything perfectly sorted out.
If we had all the answers we wouldn't need science. When it comes to the definition of energy, I want you to realize that it is important, but also to relax a little.
The fact is, no one knows what Energy is! See text book quotes below. We only know how to describe the characteristics of its various manifestations mathmatically. The same is true of other physical phenomena, such as gravity.
The "ability to do work" is more of a characteristic of energy than a definition. Or what if we call it a "defining characteristic"? A device for converting work from muscles into stored elastic energy and then converting that into kinetic energy.
Things happen when energy changes form. Back to the Defining Characteristics For the purpose of explaining energy to beginners, I think the best description is the following nearly-well-known Dave Watson definition:LEARNING OBJECTIVES By the end of this lecture you will be able to: Understand that ENERGY can be transformed from one form to another.
Know that energy exist in two forms; free energy - available for doing work or as heat - a form unavailable for doing work. Photosynthesis is the process by which plants make their own food using carbon dioxide, water and sunlight. What does Photosynthesis produce?
Photosynthesis is important because it provides two main things. MODULE - 2 Forms and Function of Plants and Animals BIOLOGY Notes Photosynthesis In photosynthesis CO2 is fixed (or reduced) to carbohydrates (glucose C6H12O6).
Water is split in the presence of light (called photolysis of water) to release O2. Note that O2 released comes from the water molecule and not from CO2. Where does photosynthesis occur? See the various kinds of energy, kinetic, chemical, gravitational potential, electrical, sound, heat or thermal energy, together with energy transfer, energy stored and energy dissipation.
A useful revision for science students. The definition of energy. Energy definitions from David Watson and various expert texts. Energy is the ability to make something happen.
An autotroph or producer, is an organism that produces complex organic compounds (such as carbohydrates, fats, and proteins) from simple substances present in its surroundings, generally using energy from light (photosynthesis) or inorganic chemical reactions (chemosynthesis).
They are the producers in a food chain, such as plants on land or algae in water (in contrast to heterotrophs as.