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section: 14 chapter: 3
Terms in this set (21)
what is a simple machine?
a machine that does work with only one movement
what are the six simple machines?
inclined plane, lever, wheel & axle, screw, wedge, and pulley
what is a compound machine?
a machine made up of a combination of simple machines
what's one example of a compound machine?
a can opener is an example
what is an inclined plane?
an inclined plane is a flat sloped surface
what do scientists think that ancient egyptians used to enable the ancient pyramids?
they figured that if they moved limestone blocks away more than 1000 KG each, the egyptians built enormous ramps
what kind of machine is a ramp?
a simple machine known as an inclined plane
why did scientist and archaeologist think that that egyptians used inclined planes?
because less force is needed to move objects from one height to another using an inclined plane than is needed to lift the object
what happens as the inclined plane becomes longer?
the force needed to move the object becomes smaller
what is the force equation?
force equals work over distance
what is a wedge? #1
an inclined plane that moves
how many sides can a wedge have? a.
only one or two sloping sides
what are other types of wedges?
a knife, an axe, and certain types of doorsteps are also wedges
what's the mechanical advantage for an inclined plane?
just as for an inclined plane, the mechanical advantage of a wedge increases as it becomes longer and thinner
what is a screw? #2.
another form of the inclined plane, a screw is an inclined plane wrapped around a cylinder or post
how does the screw form? a.
forms the screw threads just like a wedge changes the direction of the effort force applied to it a screw also changed the direction of the applied force
what happens when you turn a screw? b.
the force applied is changed by the threads to flow force between the threats and the material
what happens when you turn a screw? c.
friction between the threads and the material holds the screw tightly in place
what's the mechanical advantage of the screw? d.
the length of the inclined plane wrapped around the screw divided by the length of the screw
what's the mechanical advantage of the screw? e.
the more tightly wrapped the threads are, the easier it is to turn the screw
what's a lever?
any rigid rod or plant that pivots or rotates about a point
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