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kinetic energy, form of energy that an object or a particle has by reason of its motion. If work, which transfers energy, is done on an object by applying a net force, the object speeds up and thereby gains kinetic energy. Kinetic energy is a property of a moving object or particle and depends not only on its motion but also on its mass.
The kinetic energy is equal to 1/2 the product of the mass and the square of the speed. In formula form: where is the mass and is the speed (magnitude of the velocity) of the body. In SI units, mass is measured in kilograms, speed in metres per second, and the resulting kinetic energy is in joules .
動能 （英語： Kinetic energy ）是物質運動時所得到的 能量 。 它通常被定義成使某物體從靜止狀態至運動狀態所做的 功 。 由於運動是相對的，動能也是相對於某參照系而言。 同一物體在不同的參照系會有不同的 速率 ，也就是有不同的動能。 動能的國際單位是 焦耳 （J），以 基本單位 表示是千克米平方每秒平方（kg·m 2 ·s -2 ） [1] 。 一個物體的動能只有在速率改變時才會改變。 古典力學 [ 編輯] 在 古典力學 ，一個 質點 （一個很小的物體，它的大小基本可以忽略）或者一個沒有自轉的 剛體 的動能、 速率 與 質量 的關係是： 其中 代表動能， 代表 質量 ， 代表 速率 。 [1] 而當一個物體的質量不變，一個物體 平移 的動能、速率與質量的關係亦同上。
Google Classroom. Learn what kinetic energy means and how it relates to work. What is kinetic energy? Kinetic energy is the energy an object has because of its motion. If we want to accelerate an object, then we must apply a force. Applying a force requires us to do work.
Kinetic energy is a fundamental concept in physics that describes the energy transferred to an object due to its motion. In order to accelerate an object, force must be applied, which involves performing work. When work is done on an object, energy is transferred, resulting in the object moving with a new speed.
2024年4月15日 · 动能 （英语： Kinetic energy ）是物质运动时所得到的 能量 。 它通常被定义成使某物体从静止状态至运动状态所做的 功 。 由于运动是相对的，动能也是相对于某参照系而言。 同一物体在不同的参照系会有不同的 速率 ，也就是有不同的动能。 动能的国际单位是 焦耳 （J），以 基本单位 表示是千克米平方每秒平方（kg·m 2 ·s -2 ） [1] 。 一个物体的动能只有在速率改变时才会改变。 经典力学 [ 编辑] 在 经典力学 ，一个 质点 （一个很小的物体，它的大小基本可以忽略）或者一个没有自转的 刚体 的动能、 速率 与 质量 的关系是： 其中 代表动能， 代表 质量 ， 代表 速率 。 [1] 而当一个物体的质量不变，一个物体 平移 的动能、速率与质量的关系亦同上。
Kinetic energy is the energy that any object with mass has simply because it is moving. If an object is not moving, it has no kinetic energy. An object’s kinetic energy is directly related to its mass. Imagine two objects moving at the same speed. If one object has twice the mass of the other, it will also have twice the kinetic energy.
2020年3月24日 · Kinetic energy is also known as the work needed to accelerate a mass from rest to a final velocity. Once the object reaches this speed, the kinetic energy remains constant unless the speed is changed. Kinetic energy can take many forms, such as vibrational kinetic energy, rotational kinetic energy, and translational kinetic energy.
Kinetic Energy. Kinetic energy is energy of motion. The SI unit for energy is the joule = newton x meter in accordance with the basic definition of energy as the capacity for doing work. The kinetic energy of an object is the energy it possesses because of its motion.
Discussion. Kinetic energy is a simple concept with a simple equation that is simple to derive. Let's do it twice. Derivation using algebra alone (and assuming acceleration is constant). Start from the work-energy theorem, then add in Newton's second law of motion. ∆ K = W = F ∆ s = ma ∆ s.
