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BJU PhysicalWorld 14 Word Scramble

 
 

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Question Answer
block and tackleAn arrangement of fixed and movable pulleys connected by ropes; has a high mechanical advantage.
distance principleStates that any reduction in the effort force that is required will be paid for by an increased distance through which that force must act.
efficiencyThe percent of the work input returned as useful output.
effortThe force that must be applied to a simple machine to make it produce work.
effort armThe distance from the fulcrum to the effort.
first-class leverA lever in which the fulcrum is located between the effort and the resistance.
fulcrumThe fixed point about which a lever turns.
inclined plane A slanted surface used to raise objects.
joule(j)The SI unit of energy; equal to 1 Newton-meter of work.
law of momentsThe method of computing the amount of force exerted by levers with unequal arms; w1d1 = w2d2.
leverA rigid bar capable of turning about a fulcrum.
mechanical advantage (M.A.) The amount by which a machine magnifies effort (force).
pitchThe distance between two adjacent threads on a screw; how high or low a tone sounds to an observer (related to frequency).
power (P)The amount of work done in a given period of time. P = W/t.
pulleyA modified lever consisting of a rope that moves around a grooved wheel; can be movable or fixed.
resistanceThe force against which a simple machine works; opposition to the flow of electrons.
resistance arm The distance from the fulcrum to the resistance.
scientific idealizationApproximating an answer when an extremely accurate one is not needed.
screwAn inclined plane wound around a cylinder or cone.
second-class leverA lever in which the resistance is located between the fulcrum and the effort.
simple machinesOne- or two- part devices that make work easier; lever, wheel and axle, pulley, inclined plane, wedge, screw.
third-class leverA lever in which the effort is applied between the fulcrum and the resistance.
torqueThis is the product of a force and the length of the lever arm from the pivot point.
watt (W)The SI unit of power; 1 joule of energy per second.
wedgeTwo inclined planes placed back to back.
wheel and axleModified lever in which the effort arm and the resistance arm revolve around a central fulcrum.
workThe product of the force applied on an object multiplied by the distance the object moved; W = Fd