kinetic energy The energy an object possesses due to its being in motion. The amount of this energy will depend on both the mass (usually weight) of the object and its speed. Kinetic energy is the energy that an object has from being in motion, it's also the work that’s needed to move an object with mass from rest into motion. Let's take the guy in the video down below as enxample. As the man was running he didn't know the dock that was wet. The water on the dock redused the friction with the man's feet and it didn't slow him down, and that's what happens, energy in motion stays in motion. when the man came to an unexpectedly stop his body was still in motion (he still had pontial energy store away) wich made him go over the railing.
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Energy (also known as work) is the result of force. If an object has no energy, it cannot do any work. Forces and energy are completely different, because energy is a component of force; but a force is never part of energy, but some times this is not always true... Just like riding a bike, you use your potential energy to put force on the petals. well that force gives the bike kinetic energy. the kinetic energy is motion.
A 9th grader at Harker School in San Jose, Califorina, developed water-saveing pods that keep the seeds moist. At the age of 14, Cynth Chen found out that 80 percent of the water people use in California goes to farming. So Cynthia decided to attack the problem. Cynthia explored potential ways to reduce the amount of water used to grow the fruits and vegetables we eat. She eventually decided to focus on germination. This is the stage of growth in which a seed sprouts into a seedling, It’s also a stage that often requires a lot of water — and where, Cynthia notes, a lot of water gets wasted. “Usually farmers take seeds and they spray them over the land and cover them with soil and then spray water over,” she explains. “The problem with that is that in between the seeds there’s a lot of soil. The water lays on the soil and is unable to reach the seeds. It evaporates, and thus the water is wasted.” The teen looked for a way to reduce that water waste and designed a pod for a seed. Each seed sits in a bed of soil inside a small cup. The seed and cup then sit inside a larger cup — the used filter from the inside of a single-serving coffee pod. In between the inner cup and the outer cup, Cynthia placed a layer of water crystals — small granules that absorb water and release it over time — to keep the seed inside moist. The whole capsule can break down slowly into the soil over two to three weeks.
Get the rest of the story at : https://www.sciencenewsforstudents.org/ |
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