terminal velocity

简明释义

末速

英英释义

例句

1.In a vacuum, there is no air resistance, so objects do not have a terminal velocity 终极速度 and fall freely.

在真空中，没有空气阻力，因此物体没有终极速度 终极速度并自由下落。

2.When a skydiver jumps from an airplane, they eventually reach their terminal velocity 终极速度, where the force of gravity is balanced by air resistance.

当跳伞者从飞机上跳下时，他们最终会达到他们的终极速度 终极速度，此时重力与空气阻力相平衡。

3.During free fall, a parachutist must deploy their chute before reaching terminal velocity 终极速度 to slow down safely.

在自由落体过程中，跳伞者必须在达到终极速度 终极速度之前打开降落伞，以安全减速。

4.The terminal velocity 终极速度 of a human body in free fall is approximately 120 miles per hour.

自由落体的人体的终极速度 终极速度大约为每小时120英里。

5.The terminal velocity 终极速度 of a raindrop is much lower than that of a skydiver due to its smaller size and mass.

雨滴的终极速度 终极速度远低于跳伞者，因为它的体积和质量较小。

作文

The concept of terminal velocity refers to the maximum speed that an object can reach while falling through a fluid, such as air. This phenomenon occurs when the force of gravity pulling the object downwards is balanced by the drag force acting in the opposite direction. Understanding terminal velocity is essential in various fields, including physics, engineering, and even in activities like skydiving. When an object begins to fall, it accelerates due to gravity. However, as its speed increases, so does the air resistance acting against it. Eventually, the object reaches a point where the downward force of gravity equals the upward force of air resistance, resulting in a net force of zero. At this stage, the object stops accelerating and continues to fall at a constant speed, which is known as terminal velocity. For example, consider a skydiver jumping from an airplane. Initially, they experience rapid acceleration as they fall. As their speed increases, the air resistance builds up until it balances the gravitational pull. For a typical skydiver in a belly-to-earth position, this terminal velocity is about 53 m/s (approximately 120 mph). If the skydiver were to change their position, say by diving headfirst, their terminal velocity would increase due to a reduction in their surface area facing the airflow. The factors that influence terminal velocity include the mass of the falling object, its shape, and the density of the fluid through which it is falling. Heavier objects tend to have higher terminal velocities because the gravitational force acting on them is greater, while lighter objects will reach a lower terminal velocity. Similarly, a streamlined shape will reduce air resistance and allow for a higher terminal velocity. In engineering and design, understanding terminal velocity is crucial for safety measures. For instance, when designing parachutes, engineers must calculate the terminal velocity to ensure that the parachute deploys effectively to slow the descent of the person or object. If the parachute does not open in time, the individual could be at risk of hitting the ground at a speed that could cause serious injury or death. Moreover, terminal velocity has applications beyond skydiving. In the context of meteorology, it plays a role in understanding how raindrops fall. Larger raindrops reach a higher terminal velocity than smaller ones, which affects how precipitation reaches the ground. In conclusion, the concept of terminal velocity is a fascinating aspect of physics that illustrates the balance between forces acting on a falling object. It has practical implications in various fields, from recreational activities like skydiving to critical safety considerations in engineering. By grasping the principles behind terminal velocity, we can better understand the dynamics of falling objects and apply this knowledge in real-world scenarios.

“终极速度”这一概念指的是物体在流体（如空气）中下落时能够达到的最大速度。当向下的重力与作用于相反方向的阻力平衡时，这种现象就会发生。理解“终极速度”在物理学、工程学，甚至是跳伞等活动中都是至关重要的。当一个物体开始下落时，由于重力的作用，它会加速。然而，随着速度的增加，空气阻力也随之增大。最终，物体会达到一个点，此时向下的重力与向上的空气阻力相等，导致净力为零。在这个阶段，物体停止加速，并以恒定速度继续下落，这就是所谓的“终极速度”。例如，考虑一下从飞机上跳伞的跳伞者。起初，他们会感受到快速的加速。当他们下落的速度增加时，空气阻力逐渐增大，直到它与重力相平衡。对于典型的仰卧下落的跳伞者来说，这个“终极速度”大约是53米/秒（约120英里/小时）。如果跳伞者改变姿势，比如头朝下俯冲，他们的“终极速度”将由于迎风面积的减少而增加。影响“终极速度”的因素包括下落物体的质量、形状以及其下落流体的密度。较重的物体通常具有更高的“终极速度”，因为作用于它们的重力更大，而较轻的物体则会达到较低的“终极速度”。同样，流线型的形状会减少空气阻力，从而允许更高的“终极速度”。在工程和设计中，理解“终极速度”对安全措施至关重要。例如，在设计降落伞时，工程师必须计算“终极速度”，以确保降落伞有效展开，从而减缓人或物体的下降。如果降落伞未能及时打开，个体可能面临以可能导致严重伤害或死亡的速度撞击地面的风险。此外，“终极速度”在气象学中也有应用，它帮助理解雨滴的下落情况。较大的雨滴比较小的雨滴达到更高的“终极速度”，这影响降水到达地面的方式。总之，“终极速度”这一概念是物理学中一个引人入胜的方面，它展示了作用于下落物体的力之间的平衡。它在多个领域具有实际意义，从跳伞等休闲活动到工程中的关键安全考虑。通过掌握“终极速度”背后的原理，我们可以更好地理解下落物体的动力学，并将这一知识应用于现实场景中。