Lever systems：练习题

In a lever system, which component is defined as the fixed point around which the lever rotates?

Which class of lever is operating at the ankle when a basketball player jumps for a rebound, and what is the correct order of components for this lever?

In a first class lever system, such as the movement of the neck when looking up to see a high ball in cricket, what is the relative position of the components?

In a lever system where the fulcrum is located at one end, the load is in the middle, and the effort is applied at the opposite end, which class of lever is being used?

During a bicep curl, the elbow acts as part of a lever system. Identify the class of lever being used and explain the mechanical advantage or disadvantage typically associated with this specific lever class in the human body.

Explain the concept of mechanical advantage within a lever system and identify which class of lever always provides a mechanical advantage due to the position of the effort and the load.

A student is studying the movement of the human body and identifies that different joints act as lever systems during sporting activities.

(a) Define what is meant by the term mechanical advantage in relation to a lever system. (1 point)

(b) Identify the specific class of lever operating at the ankle joint when a basketball player performs a calf raise to jump for a rebound, and state the correct order of its three components (Effort, Fulcrum, Load). (2 points)