The Relationship between the Muscular ... - Ms. Powell's Science

The Relationship between the Muscular ... - Ms. Powell's Science

Musculoskeletal Levers The Relationship between the Muscular and Skeletal System Move It Move It Your

muscles pulling on bone often works like a SIMPLE MACHINE called a LEVER. LEVER LIMB LIMBO Most

of the bones of the limbs (ARMS and LEGS) act as Levers. LEVERS: simple machines made up of a BAR that moves around a FIXED POINT. Parts of the MACHINE Lever:

rigid bar that moves on a fixed point Fulcrum: a fixed point Effort: the applied force on the lever Load: what is being

moved (the Resistance) PARTS of the Body =Bone is equal to the Lever =Joint is equal to the Fulcrum

=Muscle (Contraction) equals the Effort (Force) =Thing being lifted equals the Load (Resistance) Mechanical Advantages/Disadvantage Advantage Disadvantage

IF the Load is IF the Load is Far Close and the from the Fulcrum Effort applied far and the Effort is from the fulcrum applied near the

fulcrum. Classes of Levers First Class: The FULCRUM is in the MIDDLE of the

LOAD and the EFFORT Ex. Seesaw, scissors, nodding your head.

Second Class Lever The LOAD is in the MIDDLE of the EFFORT and the FULCRUM.

Ex. Wheelbarrow, Standing on your toes. Third Class Lever The EFFORT is

in the MIDDLE of the LOAD and the FULCRUM. Ex. Tweezers, or Lifting weights (arm

Question Section Why are Levers Useful?

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