The definition of a lever is a bar used to control a machine.
Classes of Levers
- Class 1 levers have force applied on the opposite side of the fulcrum, or pivot point. On a see-saw, the farther away from the fulcrum you sit, the bigger the force you can produce. This is why it is easier to use a tool with a long handle. Scissors and pliers are examples of class 1 levers.
- Class 2 levers have the fulcrum at one end, like wheelbarrows, nail clippers, and nutcrackers.
- Class 3 levers also have the fulcrum at the end, but you exert force in the center and the higher force is produced at the tips, as in tweezers and tongs.
- An example of a lever is a stick shift in a car with a manual transmission.
- Examples of lever are pliers, scissors, see-saws, wheelbarrows, and tongs.
- Lever is defined as a means to get something.
An example of a lever is a family connection which might be used to get admitted to a school.
- Lever means a tool, usually a bar, used to lift or pry open something.
An example of a lever is a crowbar.
A crowbar used as a lever.
A crowbar is an example of a lever.
lever definition by Webster's New World
- a bar used as a pry
- a means to an end
- Mech. a device consisting of a bar turning about a fixed point, the fulcrum, using power or force applied at a second point to lift or sustain a weight at a third point; hence, any handle or the like used to operate something
Origin: Old French leveour ; from lever, to raise ; from Classical Latin levare ; from levis, light: see light
- to move, lift, etc. with or as with a lever
- to use as a lever
lever definition by American Heritage Dictionary
- A simple machine consisting of a rigid bar pivoted on a fixed point and used to transmit force, as in raising or moving a weight at one end by pushing down on the other.
- A projecting handle used to adjust or operate a mechanism.
- A means of accomplishing; a tool: used friendship as a lever to obtain advancement.
Origin: Middle English, from Old French levier, from lever, to raise, from Latin levāre, from levis, light; see legwh- in Indo-European roots.
top to bottom: first-class, second-class, and third-class levers
lever - Science Definition