drag force

简明释义

阻力

英英释义

例句

1.Cyclists wear aerodynamic gear to reduce drag force 阻力 while racing.

骑自行车的人穿着空气动力学装备以减少比赛时的drag force 阻力。

2.The airplane's design minimizes the drag force 阻力 to improve fuel efficiency.

飞机的设计最小化了drag force 阻力以提高燃油效率。

3.When a car accelerates, it must overcome the drag force 阻力 caused by air resistance.

当汽车加速时，必须克服由空气阻力引起的drag force 阻力。

4.Sailboats rely on wind to counteract the drag force 阻力 from water.

帆船依靠风来抵消水中的drag force 阻力。

5.In fluid dynamics, understanding drag force 阻力 is crucial for designing efficient vehicles.

在流体动力学中，理解drag force 阻力对于设计高效的车辆至关重要。

作文

In the realm of physics, particularly in fluid dynamics, understanding the concept of drag force is crucial for analyzing the motion of objects moving through a fluid, such as air or water. The drag force refers to the resistance experienced by an object as it moves through a fluid medium. This force acts in the opposite direction to the object's motion and is influenced by various factors including the shape of the object, its speed, and the properties of the fluid itself.For instance, consider a car driving down a highway. As the car accelerates, it pushes against the air in front of it, creating a drag force that opposes its forward motion. The faster the car goes, the greater the drag force becomes, which is why cars are designed with aerodynamic shapes to minimize this resistance. A streamlined design reduces turbulence and allows the vehicle to cut through the air more efficiently, thus enhancing fuel efficiency and performance.The drag force can be mathematically expressed using the drag equation: Drag Force = 0.5 * Cd * A * ρ * V²Where:- Cd is the drag coefficient, a dimensionless number that represents the drag per unit area of the object,- A is the frontal area of the object,- ρ (rho) is the density of the fluid,- V is the velocity of the object relative to the fluid.This equation illustrates how different variables affect the drag force. For example, if a cyclist wants to increase their speed, they must consider how their body position affects their frontal area and consequently the drag force. By adopting a more aerodynamic posture, cyclists can reduce their frontal area, thus lowering the drag force acting against them.In addition to vehicles, the concept of drag force is also essential in sports. Swimmers, for instance, need to be aware of the drag force as they move through water. Coaches often advise swimmers to streamline their bodies to minimize resistance and improve their speed. Similarly, in aviation, aircraft designers strive to reduce drag force to enhance fuel efficiency and performance. The wings of an airplane are shaped to create lift while minimizing the drag force, allowing the plane to fly smoothly and efficiently.Moreover, the drag force is not only relevant in everyday scenarios but also plays a significant role in scientific research and engineering applications. Engineers must account for drag force when designing structures that interact with wind or water, such as bridges, buildings, and ships. Understanding how drag force works enables engineers to create safer and more efficient designs that withstand environmental forces.In conclusion, the concept of drag force is fundamental in various fields, from automotive engineering to sports science. By grasping how drag force operates, individuals can make informed decisions that enhance performance and efficiency in numerous applications. Whether it’s a car on the highway, a swimmer in a pool, or an airplane soaring through the sky, the influence of drag force is ever-present, shaping the way we understand and interact with the physical world around us.

在物理学的领域，尤其是流体动力学中，理解“drag force”这一概念对于分析物体在流体（如空气或水）中运动至关重要。“drag force”指的是物体在流体介质中移动时所经历的阻力。这种力与物体的运动方向相反，并受到多种因素的影响，包括物体的形状、速度以及流体本身的性质。例如，考虑一辆在高速公路上行驶的汽车。当汽车加速时，它会推动前方的空气，从而产生一个与其前进方向相反的“drag force”。汽车速度越快，产生的“drag force”就越大，这就是为什么汽车设计采用流线型形状以最小化这种阻力。流线型设计减少了湍流，使车辆能够更高效地切割空气，从而提高燃油效率和性能。“drag force”可以通过拖曳方程进行数学表达：Drag Force = 0.5 * Cd * A * ρ * V²其中：- Cd 是阻力系数，一个无量纲数，表示单位面积的阻力；- A 是物体的正面面积；- ρ（rho）是流体的密度；- V 是物体相对于流体的速度。这个方程阐明了不同变量如何影响“drag force”。例如，如果一名骑自行车的人想要提高速度，他们必须考虑自己的身体姿势如何影响正面面积，从而影响“drag force”。通过采用更为流线型的姿势，骑自行车的人可以减少正面面积，从而降低对他们的“drag force”。除了车辆外，“drag force”的概念在体育运动中也至关重要。游泳运动员在水中移动时需要意识到“drag force”。教练通常建议游泳者流线型地摆动身体，以最小化阻力并提高速度。同样，在航空领域，飞机设计师努力减少“drag force”以提高燃油效率和性能。飞机的机翼经过设计，可以在产生升力的同时最小化“drag force”，使飞机能够平稳有效地飞行。此外，“drag force”不仅与日常场景相关，还在科学研究和工程应用中发挥着重要作用。工程师在设计与风或水相互作用的结构（如桥梁、建筑物和船只）时，必须考虑“drag force”。理解“drag force”的工作原理使得工程师能够创造出更安全、更高效的设计，以承受环境力量。总之，“drag force”的概念在多个领域都是基础，从汽车工程到体育科学。通过掌握“drag force”的运作原理，个人可以在众多应用中做出明智的决策，提高性能和效率。无论是在高速公路上的汽车、泳池中的游泳者，还是在天空中翱翔的飞机，“drag force”的影响无处不在，塑造着我们理解和与周围物理世界互动的方式。