moment arm

简明释义

力矩臂

英英释义

例句

1.To maximize efficiency in rowing, athletes must consider the moment arm (力矩臂) of their strokes.

为了提高划船效率，运动员必须考虑他们划桨的力矩臂。

2.The moment arm (力矩臂) of a lever increases as the distance from the pivot point increases.

杠杆的力矩臂随着离支点的距离增加而增加。

3.When analyzing joint movements, understanding the moment arm (力矩臂) is crucial for designing effective rehabilitation exercises.

在分析关节运动时，理解力矩臂对于设计有效的康复练习至关重要。

4.The longer the moment arm (力矩臂), the greater the torque produced by the force applied.

力矩臂越长，施加的力产生的扭矩就越大。

5.In weightlifting, a shorter moment arm (力矩臂) can make it easier to lift heavier weights.

在举重中，较短的力矩臂可以使举起更重的重量变得更容易。

作文

The concept of the moment arm is fundamental in understanding how forces interact with objects in both physics and biomechanics. In simple terms, the moment arm refers to the perpendicular distance from the line of action of a force to the pivot point or axis of rotation. This distance plays a crucial role in determining the torque produced by the force. Torque, which is the rotational equivalent of linear force, can be thought of as the 'twisting' force that causes an object to rotate around an axis. To better illustrate this concept, let’s consider a practical example involving a door. When you push a door to open it, the location where you apply the force significantly affects how easily the door swings open. If you push near the hinges, the moment arm is short, resulting in less torque and making it harder to open the door. Conversely, if you push at the edge of the door, far from the hinges, the moment arm is much longer, which generates greater torque and allows the door to swing open more easily. This principle is not only applicable to doors but also to many other everyday activities, such as using a wrench to tighten a bolt or performing exercises in the gym. In biomechanics, understanding the moment arm is essential for analyzing human movement. For instance, when a person performs a bicep curl, the muscles exert force on the forearm to lift a weight. The moment arm in this case is the distance between the elbow joint (the pivot point) and the line of action of the muscle force. A longer moment arm allows the muscles to generate more torque, making it easier to lift heavier weights. This is why bodybuilders often focus on exercises that maximize the moment arm to enhance their strength training. Furthermore, understanding the moment arm can also lead to better ergonomic designs in tools and equipment. For example, in designing a lever for lifting heavy objects, engineers must consider the moment arm to ensure that the lever provides sufficient mechanical advantage. A longer moment arm means less effort is required to lift the load, which is crucial in reducing fatigue and preventing injuries in workers who frequently lift heavy items. In conclusion, the moment arm is a vital concept that helps us understand how forces create torque in various contexts, from simple machines like doors to complex human movements and ergonomic designs. By recognizing the importance of the moment arm, we can apply this knowledge to improve our physical performance, enhance tool design, and ultimately make our daily tasks easier and safer. As we continue to explore the principles of physics and biomechanics, the moment arm will remain a key element in our understanding of how forces interact with objects around us.

“力臂”的概念在理解物理学和生物力学中力与物体之间的相互作用时至关重要。简单来说，“力臂”是指从力的作用线到支点或旋转轴的垂直距离。这一距离在决定由力产生的扭矩方面起着关键作用。扭矩可以被视为线性力的旋转等价物，可以被看作是导致物体围绕某个轴旋转的“扭转”力。为了更好地说明这一概念，让我们考虑一个涉及门的实际例子。当你推开一扇门时，你施加力的位置会显著影响门的开启难易程度。如果你在门的铰链附近施力，力臂较短，这导致产生的扭矩较小，使得打开门变得更加困难。相反，如果你在门的边缘施力，远离铰链，力臂就会长得多，这产生更大的扭矩，从而使门更容易打开。这一原理不仅适用于门，还适用于许多其他日常活动，例如使用扳手拧紧螺栓或在健身房进行锻炼。在生物力学中，理解“力臂”对于分析人类运动至关重要。例如，当一个人进行肱二头肌弯举时，肌肉对前臂施加力以举起重量。在这种情况下，力臂是肘关节（支点）与肌肉力的作用线之间的距离。较长的力臂允许肌肉产生更多的扭矩，使得举起更重的物体变得更容易。这就是为什么健美运动员往往专注于最大化力臂的练习，以增强他们的力量训练。此外，理解“力臂”也可以促进工具和设备的人体工程学设计。例如，在设计用于提升重物的杠杆时，工程师必须考虑“力臂”，以确保杠杆提供足够的机械优势。较长的力臂意味着需要更少的努力来提升负载，这对于减少疲劳和防止经常提重物工人的受伤至关重要。总之，“力臂”是一个重要的概念，有助于我们理解在各种背景下力量如何产生扭矩，从简单的机器如门到复杂的人体运动以及人体工程学设计。通过认识到“力臂”的重要性，我们可以将这一知识应用于提高身体表现、增强工具设计，最终使我们的日常任务变得更加轻松和安全。当我们继续探索物理学和生物力学的原理时，“力臂”将始终是我们理解力量如何与周围物体相互作用的关键要素。