Science Chap 11 Gr 6
Terms
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- work
- exerting a force on an object over a distance in the same direction as the object's motion.
- joule
- unit of measure used for work; a joule is equal to one newton-meter.
- simple machine
- a device that does work with only one movement - changes the size or direction of a force; a pully, an inclined plane, a wheel and axle, and the three classes of levers.
- inclined plane
- a simple machine with a sloped surface that makes it easier to lift objects - for example, a moving van ramp.
- screw
- an inclined plane wrapped around a rod; this simple machine makes it easier to hold objects together.
- wedge
- an inclined plan with one or two sloping sides; examples of this simple machine include knives and chisels.
- lever
- a simple machine made from a bar or rod that is free to rotate around a fulcrum; examples include seesaws and fishing rods.
- wheel and axle
- a simple machine that is made with two wheels of different sizes that are connected and turn together - for example, doorknobs and fishing reels.
- pulley
- a simple machine composed of a surface with a chain or rope going around it and that can be either fixed or movable.
- compound machine
- a machine made from the combination of two or more simple machines - for example, hand can openers and bicycles.
- fulcrum
- the pivot point around which a lever turns.