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

- [Istruttore] L'energia
cinetica è l'abilità

di qualsiasi oggetto in movimento

di fare lavoro o apportare modifiche.

Nei sistemi biologici,

gli oggetti si muovono in modi diversi,

come piccole particelle
di luce che creano cibo,

un animale che corre verso
il suo prossimo pasto,

o molecole che si diffondono

per attirare un predatore vicino.

Kohn, Kathryn P., Sonia M. Underwood e Melanie M. Cooper. "Connessioni energetiche e disconnessioni tra chimica e biologia". CBE Life Sciences Education 17, n. 1 (2018). [<a href="https://doi.org/10.1187/cbe.17-08-0169" target="__blank">Sorgente</a>]

energia cinetica

L'energia cinetica è la capacità di un oggetto in movimento di fare il lavoro o attuare il cambiamento. Può assumere molte forme. Per esempio, l'acqua che scorre lungo una cascata ha energia cinetica. Nei sistemi biologici, le particelle di luce viaggiano e vengono assorbite dalle piante per creare energia chimica. Gli animali consumano l'energia chimica e estrae molecole che portano il loro profumo attraverso l'aria. Generano anche energia cinetica quando scappano dai predatori. Interi sistemi possiedono anche energia cinetica, come il sistema solare, dove avviene il movimento di interi pianeti e stelle.

<h4>Energia cinetica</h4>

L'energia cinetica è l'energia degli oggetti in movimento. Ad esempio, mentre l'acqua dietro una diga ha energia potenziale, l'acqua che scorre rapidamente lungo una cascata ha energia cinetica. Se nella parte inferiore della cascata, l'acqua smettesse di muoversi e si unisse, la sua energia verrebbe nuovamente convertita in energia potenziale.

Nei sistemi biologici, l'energia cinetica assume varie forme man mano che gli oggetti si muovono in modi diversi. Ad esempio, le particelle di luce, ovvero i fotoni, che le piante assorbono per crescere e fare cibo, si muovono molto rapidamente, cambiano forma e sono sfruttate per fare il lavoro, sono usate per creare energia chimica sotto forma di carboidrati.

L'energia cinetica permette alle molecole che portano il profumo degli animali di allontanarsi e attirare un predatore nelle vicinanze. L'energia chimica delle piante, quando consumata dagli animali, permette agli animali di scappare da un predatore, anche una forma di energia cinetica.

L'energia cinetica può anche essere passata da un oggetto all'altro. Ad esempio, una persona che gioca a biliardo può colpire una pallina e la sua energia cinetica, quindi colpisce un'altra palla e la mette in movimento. Interi sistemi possono anche possedere energia cinetica: il movimento di tutti i pianeti e le stelle nel nostro sistema solare è l'energia cinetica.

Energia cinetica

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 ...

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KEY TERMS AND CONCEPTS

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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

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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...

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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...

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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

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Motion as a Source of Energy

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