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science chapter 2 mc
science vocabulary and definitions for chapter 2
Question | Answer |
---|---|
work | force x distance |
machine | a device that changes the amount of a force applied to an object, the direction of th force, or both |
lever | a simple machine having an arm that moves around a fixed point |
fulcrum | the fixed point on a lever |
effort arm | the part of a lever on which a person or another machine applies force on |
resistance arm | the part of a lever that applies a force on an object |
pulley | a wheel that has a groove along its edge |
wheel and axle | a simple machine that has a central pivet around which a wheel moves |
inclined plane | a flat sloping surface |
wedge | a simple machine made up of two or more inclined planes |
screw | an inclined plane wrapped around a cone or cylinder |
compound machine | a device that is made up of two or more simple machines |
efficiency | the ratio of the work that comes out of a machine, to the work being put into a machine |