kinetic friction

简明释义

运动摩擦

英英释义

例句

1.The kinetic friction 动摩擦力 acting on a sliding object can be calculated using the coefficient of friction.

作用在滑动物体上的动摩擦力 kinetic friction 可以通过摩擦系数来计算。

2.When ice skaters glide, they rely on low kinetic friction 动摩擦力 to maintain their speed.

冰上滑冰者滑行时依赖于较低的动摩擦力 kinetic friction 来保持速度。

3.The car's tires experience kinetic friction 动摩擦力 with the road when it is in motion.

当汽车行驶时，车轮与路面之间会产生动摩擦力 kinetic friction。

4.When sliding a book across a table, the kinetic friction 动摩擦力 between the book and the surface slows it down.

当把一本书滑过桌子时，书与表面之间的动摩擦力 kinetic friction 会使其减速。

5.In sports, athletes must understand kinetic friction 动摩擦力 to optimize their performance on different surfaces.

在体育运动中，运动员必须理解动摩擦力 kinetic friction，以便在不同的表面上优化他们的表现。

作文

Kinetic friction is a fundamental concept in physics that describes the force resisting the relative motion of solid surfaces, fluid layers, and material elements sliding against each other. When two objects are in contact and one slides over the other, the force that opposes this motion is known as kinetic friction (动摩擦力). This force plays a crucial role in various everyday situations, from walking to driving and even in industrial applications.To understand kinetic friction (动摩擦力), we first need to distinguish it from static friction. Static friction occurs when two objects are not moving relative to each other, preventing the initiation of motion. Once the force applied exceeds the maximum static friction, the objects begin to slide, and kinetic friction takes over. The key difference is that static friction can vary up to a maximum value, while kinetic friction (动摩擦力) remains relatively constant for a given pair of surfaces in motion.The amount of kinetic friction (动摩擦力) experienced between two surfaces depends on several factors, including the nature of the materials involved and the normal force pressing them together. The coefficient of kinetic friction, denoted by the Greek letter mu (μk), quantifies this relationship. It is a dimensionless value that varies between different material pairs. For instance, rubber on concrete has a high coefficient of kinetic friction, making it an excellent choice for tires, whereas ice on steel has a low coefficient, leading to slippery conditions.In practical terms, understanding kinetic friction (动摩擦力) is essential for engineers and designers. For example, when designing brakes for vehicles, engineers must consider the kinetic friction between the brake pads and the rotors to ensure effective stopping power. If the kinetic friction is too low, the vehicle may not stop in time, posing safety risks. Conversely, if the friction is too high, it could lead to excessive wear and tear on the components.Moreover, kinetic friction (动摩擦力) also affects energy efficiency. In machines, excessive friction can lead to energy loss in the form of heat, reducing overall efficiency. Engineers strive to minimize kinetic friction through lubrication and careful material selection to enhance performance and longevity.In our daily lives, we encounter kinetic friction (动摩擦力) in numerous scenarios. For instance, when we walk, our shoes push against the ground, and the kinetic friction (动摩擦力) generated allows us to move forward without slipping. Similarly, when we slide a book across a table, the resistance we feel is due to the kinetic friction between the book and the surface.In conclusion, kinetic friction (动摩擦力) is an integral aspect of mechanics that impacts both our daily activities and complex engineering systems. By understanding the principles behind it, we can better appreciate the forces at play in our environment and make informed decisions in design and safety. Whether it’s ensuring safe transportation or optimizing machine operation, the study of kinetic friction (动摩擦力) remains a vital area of focus in both physics and engineering.

动摩擦力是物理学中的一个基本概念，描述了抵抗固体表面、流体层和材料元素相对运动的力量。当两个物体接触并且一个物体滑过另一个物体时，抵抗这种运动的力量被称为动摩擦力（kinetic friction）。这种力量在各种日常情况下发挥着至关重要的作用，从走路到驾驶，甚至在工业应用中。要理解动摩擦力（kinetic friction），我们首先需要区分它与静摩擦。静摩擦发生在两个物体没有相对运动时，防止运动的开始。一旦施加的力量超过最大静摩擦，物体就开始滑动，动摩擦力开始发挥作用。关键区别在于，静摩擦可以变化直到最大值，而动摩擦力（kinetic friction）对于一对给定的运动表面保持相对恒定。动摩擦力（kinetic friction）所经历的量取决于几个因素，包括所涉及材料的性质和将它们压在一起的法向力。动摩擦系数，用希腊字母μ（μk）表示，量化了这种关系。它是一个无量纲值，在不同材料对之间变化。例如，橡胶与混凝土之间的动摩擦系数很高，使其成为轮胎的绝佳选择，而冰与钢之间的动摩擦系数较低，导致滑溜的情况。从实际角度来看，理解动摩擦力（kinetic friction）对工程师和设计师至关重要。例如，在设计车辆制动器时，工程师必须考虑制动片与转子之间的动摩擦力，以确保有效的制动能力。如果动摩擦力太低，车辆可能无法及时停车，存在安全风险。相反，如果摩擦力过高，可能会导致部件的过度磨损。此外，动摩擦力（kinetic friction）还影响能源效率。在机器中，过多的摩擦会导致以热量形式的能量损失，从而降低整体效率。工程师努力通过润滑和仔细选择材料来最小化动摩擦力，以增强性能和使用寿命。在我们的日常生活中，我们在许多场景中遇到动摩擦力（kinetic friction）。例如，当我们走路时，鞋子推动地面，产生的动摩擦力（kinetic friction）使我们能够向前移动而不滑倒。同样，当我们将一本书滑过桌子时，我们感受到的阻力就是由于书与表面之间的动摩擦力。总之，动摩擦力（kinetic friction）是力学的一个不可或缺的方面，影响着我们的日常活动和复杂的工程系统。通过理解其背后的原理，我们可以更好地欣赏环境中所起的作用，并在设计和安全方面做出明智的决策。无论是确保安全运输还是优化机器操作，研究动摩擦力（kinetic friction）仍然是物理学和工程学中的一个重要研究领域。