What Is the Major Factor Controlling How Levers Work

question 59

Multiple Choice

What is the major factor controlling how levers work?

• A) the direction the load is being moved
• B) the structural characteristics of the muscles of the person using the lever
• C) the weight of the load
• D) the difference in the positioning of the effort, load, and fulcrum

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Definitions:

Supination

The outward rotation of the forearm or foot that results in the palm or sole facing upwards or forwards, respectively.

Pronation

Rotation of the forearm so that the anterior surface is down (prone).

Radius

A bone in the forearm that extends from the lateral side of the elbow to the thumb side of the wrist.

Ulna

One of the two long bones in the forearm, extending from the elbow to the smallest finger, and playing a vital role in arm movement and stability.