Question

multiple choice question

within a lever system, what is the resistance arm?

the portion of the lever from the fulcrum to the point of resistance
the portion of the lever from the point at which effort is applied to the fulcrum

Explanation:

Define a lever system

Using the Skeletal Lever Systems knowledge point
A biomechanical lever system consists of a rigid bar (bone), a fulcrum (joint), an applied effort (muscle contraction), and a resistance or load (weight of the body part or an external object).

Identify the resistance arm

Using the Skeletal Lever Systems knowledge point
The resistance arm (or load arm) is defined as the distance or portion of the lever extending from the fulcrum to the point where the resistance is applied.

Identify the effort arm

Using the Skeletal Lever Systems knowledge point
The effort arm is defined as the portion of the lever extending from the point of effort application to the fulcrum.

Evaluate the given options

Using the Skeletal Lever Systems knowledge point

• Option 1: "The portion of the lever from the fulcrum to the point of resistance" matches the definition of the resistance arm.
• Option 2: "The portion of the lever from the point at which effort is applied to the fulcrum" describes the effort arm.

Answer:

• The portion of the lever from the fulcrum to the point of resistance (Correct answer)
• The portion of the lever from the point at which effort is applied to the fulcrum