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"Machines"
Types of Machines Found in the Body
Question | Answer |
---|---|
Machines | used to increase mechanical advantage |
How many ways do machines function? | 4 |
4 ways machines function | -Balance forces, enhance force, enhance range of motion & speed, alter resulting direction of the applied force |
3 Types of machines found in the body | Levers (most common), Wheel-axles, Pulleys |
Levers | a rigid bar that turns about an axis of rotation or a fulcrum |
Axis | axis - point of rotation about which lever moves |
Three points determine type of lever & for which kind of motion it is best suited | -Axis (A)- fulcrum - the point of rotation -Point (F) of force application (usually muscle insertion)-Point (R) of resistance application (center of gravity of lever) or (location of an external resistance) |
First class - | FAR (teeter totter) - Balance(d) |
Second class - | ARF (Wheel Barrel) - power |
Third class - | AFR ( Baseball bat) - Speed |