Midterm- Miscellaneous Flashcards
force couple
2 forces act in equal but opposite directions
-turning effect
resultant force
combined effect of all forces acting on an object
-up and side forces produce diagonal (cumulative)
law of inertia
force required to start, stop, or change object’s direction
-object stays at rest or remains in motion
law of acceleration
F= ma (force = mass x acceleration)
law of action-reaction
for every action, there’s an equal & opposite reaction
1st class lever & example, & MA
F > A > R;
seesaw or atlanto-occipital joint
MA varies; designed for balance
2nd class lever, example, & MA
F > R > A;
wheelbarrow or calf raise
MA > 1; designed for power
3rd class lever, example & MA
A > F > R;
bicep curl, crane (bony levers)
MA < 1; designed for speed (inefficient)
Ways to increase torque
increase force
increase lever arm
apply force perpendicular
uniaxial joint (2)
hinge joint
pivot joint
-1 plane, 1 axis
biaxial joint (2)
condyloid/ellipsoidal joint: oval/convex w/ oval/concave
sellar/saddle joint: both concave/convex per side
-2 planes, 2 axes
triaxial joint
ball & socket
- 3 planes, 3 axes
name 4 nerve plexuses
cervical,
brachial,
lumbar,
sacral
irritability/excitability
ability to receive/respond to stimuli
contractility
ability to contract/shorten
-generate force in response to stimuli
