终端速度和自由落体是两个相关的概念,它们往往会混淆,因为它们取决于身体是否在空的空间或流体(例如,大气或甚至是水)中。看看这些术语的定义和方程,它们是如何相关的,以及身体在不同条件下自由落体或终端速度下降的速度。终端速度定义为通过流体(例如空气或水)落下的物体可以达到的最高速度。当达到终端速度时,向下的重力等于物体的浮力和阻力之和。对象终端速度具有零净加速度。 “自由落体”一词的日常使用与科学定义不同。在通常的使用中,天空潜水员被认为在没有降落伞的情况下实现终端速度时自由落体。实际上,天空潜水员的重量由空气垫支撑。根据牛顿(经典)物理学或广义相对论来定义自由落体。在经典力学中,自由落体描述了当作用于它的唯一力是重力时身体的运动。运动的方向(向上,向下等)并不重要。如果引力场是均匀的,它对身体的所有部位起作用,使其“失重”或经历“0 g”。虽然看起来很奇怪,但即使向上或向上移动物体,物体也可以自由落体。从大气外跳跃的跳伞运动员(如HALO跳跃)几乎可以实现真正的终端速度和自由落体。

美国布朗大学物理学Assignment代写:终端速度和自由落体

Terminal velocity and free fall are two related concepts that tend to get confusing because they depend on whether or not a body is in empty space or in a fluid (e.g., and atmosphere or even water). Take a look at the definitions and equations of the terms, how they are related, and how fast a body falls in free fall or at terminal velocity under different conditions. Terminal velocity is defined as the highest velocity that can be achieved by an object that is falling through a fluid, such as air or water. When terminal velocity is reached, the downward force of gravity is equal to the sum of the object’s buoyancy and the drag force. An object a terminal velocity has zero net acceleration. The everyday use of the term “free fall” is not the same as the scientific definition. In common usage, a sky diver is considered to be in free fall upon achieving terminal velocity without a parachute. In actuality, the weight of the sky diver is supported by a cushion of air. Free fall is defined either according to Newtonian (classical) physics or in terms of general relativity. In classical mechanics, free fall describes the motion of a body when the only force acting upon it is gravity. The direction of the movement (up, down, etc.) is unimportant. If the gravitational field is uniform, it acts equally on all parts of the body, making it “weightless” or experiencing “0 g”. Although it might seem strange, an object can be in free fall even when moving upward or at the top of its motion. A skydiver jumping from outside the atmosphere (like a HALO jump) very nearly achieves true terminal velocity and free fall.

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