槓桿系統與機械利益：练习题

In the human body, the second-class lever system provides a significant mechanical advantage. In which sporting action is a second-class lever being utilised?

A sportsperson is using a lever where the effort arm is \(5\text{cm}\) and the load arm is \(35\text{cm}\). Calculate the mechanical advantage and identify which sporting action most likely uses this system.

When a basketball player performs a vertical jump, they utilize a lever system at the ankle to propel themselves upwards. Identify the order of the components in this lever system and the mechanical advantage it provides.

In a third-class lever, such as the elbow during a bicep curl, the effort arm is always shorter than the resistance arm. What is the primary mechanical benefit of this arrangement for a tennis player hitting a smash?

A first-class lever is used when an athlete extends their neck to look up at a high ball. If the distance from the fulcrum to the muscle attachment (effort) is shorter than the distance from the fulcrum to the head's center of mass (load), what is the mechanical advantage?

A sprinter is performing a stationary start from the blocks. Explain why the ankle joint acts as a second-class lever during the drive phase, and identify the mechanical advantage this specific lever system provides for the movement.