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relative position of the fulcrum in three basic types of levers, with arrows indicating the direction of the effort and the downward force of the load
n. pl. ful·crums or ful·cra (-krə)
1. The point or support on which a lever pivots.
2. Zoology An anatomical structure that acts as a hinge or a point of support.
3. An agent through which vital powers are exercised.
[Latin, bedpost, from fulcīre, to support.]
n, pl -crums or -cra (-krə)
1. (Mechanical Engineering) the pivot about which a lever turns
2. something that supports or sustains; prop
3. (Zoology) a spinelike scale occurring in rows along the anterior edge of the fins in primitive bony fishes such as the sturgeon
[C17: from Latin: foot of a couch, bedpost, from fulcire to prop up]
ful•crum(ˈfʊl krəm, ˈfʌl-)
n., pl. -crums, -cra (-krə).
1. the support, or point of rest, on which a lever turns in moving a body.
2. any prop or support.
3. any of various structures in an animal serving as a hinge or support.
[1665–75; < Latin: back-support of a couch]
This diagram shows the relative position of the fulcrum in the three basic types of levers, with arrows indicating the direction of the effort and the downward force of the load.
top: The effort and load are on opposite sides of the fulcrum, as in a crowbar.
middle: The load is between the fulcrum and effort, as in a wheelbarrow.
bottom: The effort is between the fulcrum and load, as in a person's forearm, where the fulcrum is the elbow and the load is something held in the hand.
The point or support on which a lever turns.
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|Noun||1.||fulcrum - the pivot about which a lever turns|
lever - a rigid bar pivoted about a fulcrum