free fall

简明释义

自由下落

英英释义

例句

1.In physics class, we learned that objects in free fall (自由落体) accelerate at 9.8 m/s² due to gravity.

在物理课上，我们学习到，处于自由落体(自由落体)状态的物体因重力加速度为9.8米/秒²。

2.The roller coaster took a sudden drop, and I screamed as we went into free fall (自由落体).

过山车突然下降，我尖叫着进入了自由落体(自由落体)。

3.The diver entered the water with a perfect technique after a thrilling free fall (自由落体) from the platform.

跳水运动员在平台上进行了一次刺激的自由落体(自由落体)后，以完美的技巧入水。

4.The astronaut experienced free fall (自由落体) while orbiting the Earth on the space station.

宇航员在空间站绕地球轨道飞行时经历了自由落体(自由落体)。

5.During the skydiving experience, I felt like I was in free fall (自由落体) for several seconds before the parachute opened.

在跳伞体验中，我感觉自己在自由落体(自由落体)几秒钟，直到降落伞打开。

作文

In physics, the term free fall refers to the motion of an object under the influence of gravitational force alone. When an object is in free fall, it experiences a state of weightlessness as it accelerates towards the Earth at a constant rate of approximately 9.81 meters per second squared, ignoring air resistance. This concept is not only crucial in understanding basic physics but also has profound implications in various fields, including engineering, space exploration, and even sports. To illustrate the idea of free fall, consider a simple example: when you drop a ball from a height, the ball will accelerate downwards due to gravity. Initially, it may seem to fall slowly, but as time progresses, it picks up speed, illustrating the principles of free fall. The longer the ball falls, the faster it goes, until it eventually hits the ground. This acceleration can be calculated using the formula: distance = 0.5 * g * t², where g is the acceleration due to gravity and t is the time in seconds. The phenomenon of free fall is not limited to objects falling to the ground. In space, astronauts experience free fall while orbiting the Earth. Despite being far from the Earth's surface, they are still under the influence of gravity. However, because they are moving forward at such high speeds, they continue to fall towards Earth but never actually reach it, resulting in a state of continuous free fall. This is often referred to as microgravity, which allows astronauts to float inside their spacecraft. Understanding free fall is essential for engineers designing buildings and bridges. They must account for the forces acting on structures during various scenarios, including earthquakes or strong winds. Knowing how objects behave in free fall helps ensure that structures can withstand these forces without collapsing. In sports, the concept of free fall plays a critical role as well. For instance, in skydiving, jumpers experience free fall for a short period before deploying their parachutes. During this time, they feel a rush of adrenaline as they accelerate towards the ground. Understanding the physics behind free fall allows skydivers to calculate their descent rates and make safe landings. In conclusion, the term free fall encapsulates a fundamental concept in physics that describes the motion of objects under the influence of gravity. Whether in everyday situations, engineering applications, or thrilling sports activities, the principles of free fall are all around us. By grasping these concepts, we can better appreciate the world we live in and the forces that shape our experiences. The study of free fall not only enhances our understanding of physical laws but also inspires innovation and safety in various domains of life.

在物理学中，术语自由落体指的是物体仅在重力作用下的运动。当一个物体处于自由落体状态时，它会经历一种失重状态，因为它以大约每秒9.81米的恒定速率向地球加速，忽略空气阻力。这个概念不仅对理解基础物理至关重要，而且在工程、太空探索甚至体育等多个领域都具有深远的影响。为了说明自由落体的概念，可以考虑一个简单的例子：当你从高度掉下一个球时，球会因重力向下加速。起初，它可能看起来掉得很慢，但随着时间的推移，它的速度会加快，说明了自由落体的原理。球掉落的时间越长，速度越快，直到最终撞击地面。这个加速度可以通过公式计算：距离 = 0.5 * g * t²，其中g是重力加速度，t是以秒为单位的时间。自由落体现象不仅限于物体落到地面。在太空中，宇航员在绕地球飞行时也会经历自由落体。尽管他们远离地球表面，但仍然受到重力的影响。然而，由于他们以如此高的速度向前移动，他们继续向地球坠落，但实际上从未到达地面，导致一种持续的自由落体状态。这通常被称为微重力，使宇航员能够在航天器内漂浮。理解自由落体对设计建筑和桥梁的工程师至关重要。他们必须在各种情况下考虑作用在结构上的力量，包括地震或强风。了解物体在自由落体中的行为有助于确保结构能够承受这些力量而不倒塌。在体育运动中，自由落体的概念也发挥着关键作用。例如，在跳伞中，跳伞者在打开降落伞之前会体验到短暂的自由落体。在此期间，他们感受到肾上腺素的冲击，因为他们向地面加速。理解自由落体背后的物理学使跳伞者能够计算他们的下降速度并安全着陆。总之，术语自由落体概括了一个基本的物理概念，描述了物体在重力作用下的运动。无论是在日常情况、工程应用还是刺激的体育活动中，自由落体的原理无处不在。通过掌握这些概念，我们可以更好地欣赏我们所生活的世界以及塑造我们体验的力量。对自由落体的研究不仅增强了我们对物理定律的理解，还激励了各个领域的创新和安全。