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Vocabulary Word

Word: fulcrum

Definition: support on which a lever rests or pivots


Sentences Containing 'fulcrum'

In any form of lever there are only three things to be considered: the point where the weight rests, the point where the force acts, and the point called the fulcrum about which the rod rotates.
The distance from the force to the fulcrum is called the force arm.
For example, the fulcrum is sometimes at one end, the force at the opposite end, and the weight to be lifted between them.
Suspend a stick with a hole at its center as in Figure 98, and hang a 4 pound weight at a distance of 1 foot from the fulcrum, supporting the load by means of a spring balance 2 feet from the fulcrum.
Move the 4 pound weight so that it is very near the fulcrum, say but 6 inches from it; then the spring balance registers a force only one fourth as great as the weight which it suspends.
The fulcrum is at the wheel, the force is at the handles, the weight is on the wheelbarrow.
If the load is halfway from the fulcrum to the man's hands, the man will have to lift with a force equal to one half the load.
If the load is one fourth as far from the fulcrum as the man's hands, he will need to lift with a force only one fourth as great as that of the load.

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