| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 2.73 |
| Score | 0% | 55% |
A wedge is most similar to what other type of simple machine?
inclined plane |
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second-class lever |
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first-class lever |
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third-class lever |
The wedge is a moving inclined plane that is used to lift, hold, or break apart an object. A wedge converts force applied to its blunt end into force perpendicular to its inclined surface. In contrast to a stationary plane where force is applied to the object being moved, with a wedge the object is stationary and the force is being applied to the plane. Examples of a wedge include knives and chisels.
A wedge converts force applied to its blunt end into force __________ its inclined surface.
parallel to |
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opposite to |
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perpendicular to |
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along |
The wedge is a moving inclined plane that is used to lift, hold, or break apart an object. A wedge converts force applied to its blunt end into force perpendicular to its inclined surface. In contrast to a stationary plane where force is applied to the object being moved, with a wedge the object is stationary and the force is being applied to the plane. Examples of a wedge include knives and chisels.
Which of the following is not a type of simple machine?
gear |
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lever |
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screw |
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pulley |
The six types of simple machines are the lever, wheel and axle, pulley, inclined plane, wedge, and screw.
A screw is most like which of the following other simple machines?
block and tackle |
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first-class lever |
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wheel and axle |
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inclined plane |
A screw is an inclined plane wrapped in ridges (threads) around a cylinder. The distance between these ridges defines the pitch of the screw and this distance is how far the screw advances when it is turned once. The mechanical advantage of a screw is its circumference divided by the pitch.
The advantage of using a third-class lever is that it increases:
the speed of the load |
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the force applied to the load |
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the mechanical advantage of the lever |
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the distance traveled by the load |
A third-class lever is used to increase distance traveled by an object in the same direction as the force applied. The fulcrum is at one end of the lever, the object at the other, and the force is applied between them. This lever does not impart a mechanical advantage as the effort force must be greater than the load but does impart extra speed to the load. Examples of third-class levers are shovels and tweezers.