terminal velocity

简明释义

终速度

英英释义

例句

1.When an object falls freely, it eventually reaches its terminal velocity (终极速度), where the force of gravity is balanced by air resistance.

当一个物体自由下落时，它最终会达到其终极速度（终极速度），在这个速度下，重力与空气阻力相平衡。

2.Understanding terminal velocity (终极速度) is crucial in designing parachutes.

理解终极速度（终极速度）对于降落伞的设计至关重要。

3.A feather falls slower than a rock because its terminal velocity (终极速度) is much lower due to air resistance.

羽毛的下落速度比石头慢，因为它的终极速度（终极速度）由于空气阻力而低得多。

4.Skydivers must be aware of their terminal velocity (终极速度) to ensure a safe landing.

跳伞者必须了解他们的终极速度（终极速度），以确保安全着陆。

5.The terminal velocity (终极速度) of a skydiver in a belly-to-earth position is about 120 miles per hour.

处于腹部朝下姿势的跳伞者的终极速度（终极速度）约为每小时120英里。

作文

The concept of terminal velocity refers to the constant speed that an object eventually reaches when falling through a fluid, such as air or water. When an object is dropped from a height, it accelerates due to gravity. However, as it falls, it encounters resistance from the fluid it is moving through. This resistance increases with the speed of the object until it balances the force of gravity acting on the object. At this point, the object stops accelerating and continues to fall at a constant speed, known as terminal velocity. Understanding this phenomenon is crucial in various fields, including physics, engineering, and even safety measures for skydivers.To illustrate the concept, consider a skydiver jumping from an airplane. Initially, the skydiver accelerates towards the ground due to the gravitational pull. However, as they gain speed, the air resistance increases. Eventually, the upward force of air resistance equals the downward force of gravity. At this moment, the skydiver reaches their terminal velocity, which is approximately 53 meters per second (around 120 miles per hour) in a belly-to-earth position. This speed is significant because it represents the maximum speed the skydiver will reach during free fall.The factors that influence terminal velocity include the mass of the falling object, its surface area, and the density of the fluid it is falling through. Heavier objects tend to have a higher terminal velocity because they experience a greater gravitational force. In contrast, objects with a larger surface area encounter more air resistance, which can reduce their terminal velocity. For instance, a skydiver in a spread-eagle position will have a lower terminal velocity than one in a head-down position due to the increased surface area facing the direction of the fall.In addition to skydiving, the concept of terminal velocity also applies to other scenarios, such as the fall of raindrops or the descent of parachutes. Raindrops, for example, reach a terminal velocity that allows them to fall to the ground without being broken apart by air resistance. Similarly, parachutes are designed to create enough drag to reduce the terminal velocity of a person falling, ensuring a safe landing.Understanding terminal velocity is not only academically interesting but also practically important. It helps engineers design safer vehicles and equipment, informs safety protocols for extreme sports, and enhances our knowledge of natural phenomena. For instance, when designing a parachute, engineers must calculate the desired terminal velocity to ensure that the parachutist lands safely. Likewise, understanding how different shapes and materials affect terminal velocity can lead to innovations in various industries.In conclusion, terminal velocity is a fundamental concept in physics that describes the maximum speed of an object falling through a fluid. It is determined by the balance of forces acting on the object and is influenced by factors such as mass, surface area, and fluid density. Whether it is a skydiver, a raindrop, or a piece of equipment, the principles of terminal velocity play a crucial role in our understanding of motion and safety in various applications. As we continue to explore the laws of physics, the significance of terminal velocity remains a key topic that bridges theory with real-world implications.

“终端速度”这一概念指的是物体在流体（如空气或水）中下落时最终达到的恒定速度。当一个物体从高处掉落时，它会因重力加速。然而，随着它的下落，它会遇到来自流体的阻力。随着物体速度的增加，这种阻力也会增加，直到它抵消作用于物体的重力。在这一点上，物体停止加速，并以恒定速度继续下落，这一速度称为“终端速度”。理解这一现象在物理学、工程学，甚至是跳伞者的安全措施等多个领域都是至关重要的。为了说明这个概念，可以考虑一个跳伞者从飞机上跳下的情景。最初，跳伞者因重力向地面加速。然而，随着速度的增加，空气阻力也在增大。最终，空气阻力的向上作用力等于重力的向下作用力。在这一时刻，跳伞者达到了他们的“终端速度”，在仰卧姿势下，大约为每秒53米（约每小时120英里）。这个速度是重要的，因为它代表了跳伞者在自由落体过程中将达到的最大速度。影响“终端速度”的因素包括下落物体的质量、表面积和所处流体的密度。较重的物体通常具有较高的“终端速度”，因为它们受到更大的重力作用。相反，表面积较大的物体会遇到更多的空气阻力，这可能会降低它们的“终端速度”。例如，一个以张开姿势下落的跳伞者，其“终端速度”将低于一个以头朝下姿势下落的跳伞者，因为前者的迎风面积更大。除了跳伞，“终端速度”这一概念同样适用于其他场景，比如雨滴的下落或降落伞的下降。雨滴会达到一种“终端速度”，使其能够在不被空气阻力击碎的情况下落到地面。同样，降落伞设计旨在产生足够的阻力，以降低下落者的“终端速度”，确保安全着陆。理解“终端速度”不仅在学术上有趣，而且在实践中也非常重要。它帮助工程师设计更安全的车辆和设备，告知极限运动的安全协议，并增强我们对自然现象的理解。例如，在设计降落伞时，工程师必须计算所需的“终端速度”，以确保跳伞者安全着陆。同样，理解不同形状和材料如何影响“终端速度”可以促进各行业的创新。总之，“终端速度”是物理学中的一个基本概念，描述了物体在流体中下落时的最大速度。它由作用于物体的力的平衡决定，并受质量、表面积和流体密度等因素的影响。无论是跳伞者、雨滴还是设备，“终端速度”的原理在我们理解运动和各种应用中的安全性方面发挥着关键作用。随着我们继续探索物理法则，“终端速度”的重要性仍然是一个连接理论与现实世界影响的关键主题。