Levers.

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Presentation transcript:

Levers

Levers Levers are designed to allow either: A greater resistance to be moved with a given force OR To increase the velocity (speed) at which an object can be moved using a given force

Parts of a Lever Levers consist of 3 parts; Resistance Force Fulcrum The distance from where a force is applied to the fulcrum is called the force arm (FA) The distance from where a resistance acts to the fulcrum is called the resistance arm (RA)

First Class Lever The fulcrum lies between the resistance and the force Force Arm shorter than Resistance Arm favours speed and range of movement Force Arm longer than Resistance Arm favours force output

First Class Levers

Second Class Lever The resistance lies between the fulcrum and the force The force arm and the resistance arm are on the same side of the lever The Force Arm is always longer than the Resistance Arm

Second Class Levers

Third Class Lever The force lies between the resistance and the fulcrum The Force Arm is shorter than the Resistance Arm In third class levers, the force applied is always greater than the resistance

Third Class Levers

Torque = Force x Distance As all levers produce rotation about an axis, they also produce torque. Torque is defined as a turning force T = F x D Torque = Force x Distance The greater the force applied to a given force arm the greater the torque The longer the force arm with a given force applied the greater the torque