simple biometrics
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what is force
a push or a pull action applied upon an object (measured in Newtons)
what is newtons 2nd law
f=ma
how to identify classes of levers
FRE, 123
what are forces
• gravity • air resistance • muscular force • ground reaction force
example of first class lever in body
head - trapezius provide effort force - weight of head provide resistance - joint between spine and cranium fulcrum
example of second class lever in body
standing on tip-toes - fulcrum is joints between toes - resistance is bodyweight - effort provided by gastrocnemius
advantage of second class lever
strength
examples of third class levers in body
bicep curl - fulcrum is elbow joint - effort provided by bicep - resistance is weight of dumbbell, hand, arm footballer kicks ball
advantage of third class lever
speed