Shared Flashcard Set

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Simple Machines
N/A
11
Science
8th Grade
01/21/2009

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Cards

Term
Incline Plane
Definition
flat, slanted surface
ex. ramp (multiply force, increase distance) p.119-120, 130
Term
Wedge
Definition
2 incline planes put together; cutting surface moving
ex. axe p.120, 124
Term
Screw
Definition
incline plane wrapped around a cylinder
-the more threads the longer the incline plane the greater the mechanical advantage p.121
Term
Lever
Definition
rigid bar free to move around a fixed point called a fulcrum p.121-123
Term
1st class lever
Definition
multiply force, sometimes changes directions
Term
2nd class lever
Definition
multiply force, barely changes directions
Term
3rd class lever
Definition
multiply distance, never changes directions
Term
Pulley
Definition
rope or chain wrapped around a,grooved wheel fixed pulley-changing directions
multiple pulley-inc. distance, multiply force p.126-127
Term
Wheel and axle
Definition
two cylinder objects fastened together rotate about common axis
ex. car wheel and axle, door knob p.124-126
Term
Mechanical Advantage
Definition
the number of times input force is multiplied by the machine. the distance input force travels is increased p.113 IDEAL - w/o friction ACTUAL - w/ friction p.115
Term
Efficiency
Definition
relationship between input WORK and output WORK % efficiency= output/input x 100. p.114-115
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