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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 .
- KE, Eₖ, K or T
- joule (J)
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 Editors of Encyclopaedia Britannica
- Kinetic energy is a 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...
- Translational kinetic energy of a body is equal to one-half the product of its mass, m, and the square of its velocity, v, or 1/2mv2. For a rotatin...
- For everyday objects the energy unit in the metre-kilogram-second system is the joule. A 2-kg mass (4.4 pounds on Earth) moving at a speed of one m...
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.
- Net-work just means the _total work_ done by the system. And the value of *net work* = change in kinetic energy.
- By definition, "energy density" tells you energy per mass for the propellant. In other words, energy density is equal to the amount of energy conta...
- The simplest derivation is this..... Work W=Fx sort of definition. Then putting F=ma and x=(1/2)at^2 in above gives W=(1/2)m(a^2)(t^2) =(1/2)m v^2...
- Yes, you should convert MJ to J. The reason that your answer must me multiplied by 1000 since sqrt(10^6)=10^3=1000
- You are asking a question, which is answered very well in the current topic :( However, here is somewhat a different proof based on the same idea,...
- Sound energy is a type of kinetic energy.
- The propellant is used up as the rocket gains speed, right? When the propellant is all gone, the rocket's KE has to be equal to whatever energy was...
- If it stops, that means someone or something else was "applying energy". In physics we call that "doing work". Friction does work to stop the objec...
动能 （英語： 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. 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。
2021年3月25日 · Kinetic energy is the energy an object has due to its motion. Examples of kinetic energy include walking, falling, flying, and throwing. Potential and kinetic energy are the two major types of energy. Here is a look at kinetic energy, including its definition, examples, units, formula, and how to calculate it.
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.
