NAVY OAR Mechanical
comprehension
What provides mechanical advantage? - answer Movable pulleys
Gear Revolutions [Formula] - answerr = (D*R)/d ; r*d = R*D
Gear Revolutions - answerD: # of teeth on gear A
R: revolutions of gear A
d: # of teeth on gear B
r: revolutions of gear B
Hydrometers - answerUse floats to measure specific gravity
Specific gravity - answerweight of a liquid as compared with the weight of water
LEVERS - answerfirst class, second class, third class
fulcrum - answerThe fixed point around which a lever pivots
Effort - answerinput force
load - answerOutside force
First class - answerthe fulcrum is the middle (scissors, pliers)
Third class - answerFulcrum is at one end, efforts in between (tongs, tweezers)
Second class - answerFulcrum is at one end, load is in between (Nutcracker,
wheelbarrow)
pulley - answerA type of lever that is a wheel with a groove in its rim, which is used to
change the direction or multiply a force exerted by a rope or cable.
Smaller pulley - answerturns faster to keep up with larger pulley
Mechanical advantage in pistons - answera2 x d2 = a1 x d1
(smaller D)/(bigger D) = mechanical advantage
a: area
d: displacement
Axe - answerclassified as a wedge, which is an incline plane
comprehension
What provides mechanical advantage? - answer Movable pulleys
Gear Revolutions [Formula] - answerr = (D*R)/d ; r*d = R*D
Gear Revolutions - answerD: # of teeth on gear A
R: revolutions of gear A
d: # of teeth on gear B
r: revolutions of gear B
Hydrometers - answerUse floats to measure specific gravity
Specific gravity - answerweight of a liquid as compared with the weight of water
LEVERS - answerfirst class, second class, third class
fulcrum - answerThe fixed point around which a lever pivots
Effort - answerinput force
load - answerOutside force
First class - answerthe fulcrum is the middle (scissors, pliers)
Third class - answerFulcrum is at one end, efforts in between (tongs, tweezers)
Second class - answerFulcrum is at one end, load is in between (Nutcracker,
wheelbarrow)
pulley - answerA type of lever that is a wheel with a groove in its rim, which is used to
change the direction or multiply a force exerted by a rope or cable.
Smaller pulley - answerturns faster to keep up with larger pulley
Mechanical advantage in pistons - answera2 x d2 = a1 x d1
(smaller D)/(bigger D) = mechanical advantage
a: area
d: displacement
Axe - answerclassified as a wedge, which is an incline plane
