Lever — Science definition
A rigid bar turning about a pivot; limbs trade force for speed and range by attaching the muscle close to the joint.
Where it is taught
- Bones, Muscles & Structure-Function Models — Body Organization, Transport & Movement, Life Science & Scientific Inquiry, Grade 7
In use
Put a rigid bone, a pivot at a joint, and a pull from a muscle together and you have a lever.
Bones, Muscles & Structure-Function Models
Questions using lever
Problem 1
Can a paper lever determine someone’s safe lifting limit?
Answer and explanation
No. It omits biological and individual factors and is only a selected relationship model.