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# lever

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on 13 February 2013

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#### Transcript of lever

Class One Lever Class Two Lever -- Wheel barrel

-- Nutcracker

-- Bottle Opener Class Three Lever --Fishing Pole

--Tongs

Ex.
Seesaw
Hammer
Scissors Input Output 1 1 1 1 1+1+1=3 3:1 output to input ratio Fulcrum Load Effort --aka: Support

-- Fixed Point

--The position of the Fulcrum
in relation to the Load and Force
determines the type of lever

-- Determines Mechanical

--The force that is opposing
the Effort

--Takes the same amount of work
as the effort --aka: Force

--The force that is applied to
the system to make a task easier.

--Takes the same amount of work as the load. The Fulcrum is positioned between the load and the Effort When the effort is smaller than the load,
the effort moves further than the load the lever can be considered as a force magnifier The amount of work for the effort = the amount of work for the load More Concepts Fulcrum Equation of work: Work(Joules)= force x distance work= 20lbs x 5ft
work= 100Joules work= 100lbs x 1ft
work= 100Joules These concepts lead to an equation

Fe = Fl dl / de (1)

where

Fe = effort force (N, lb)

Fl = load force (N, lb) (note that weight is a force)

dl = distance from load force to fulcrum (m, ft)

de = distance from effort force to fulcrum (m, ft) Mechanical Advantage formula Distance Effort (de) Distance Load (dl) Input Output 3:1 Output to Input ratio More Concepts •When the effort is smaller than the load
•the effort moves further than the load •The lever can be considered as a force magnifier •the effort and the load are positioned on the same side of the fulcrum but applied in opposite directions
•the load lies between the effort and the fulcrum
•the effort is smaller than the load
•the effort moves further than the load
•the lever can be considered as a force magnifier --The effort and the load are positioned on the same side of the fulcrum but applied in opposite directions.

--The load lies between the effort and the fulcrum 100lb 10lb --These concepts lead to a formula Fe = Fl dl / de (1)

where

Fe = effort force (N, lb)

Fl = load force (N, lb) (note that weight is a force)

dl = distance from load force to fulcrum (m, ft)

de = distance from effort force to fulcrum (m, ft) Concepts These concepts lead to a formula •the effort lies between the load and the fulcrum

•the effort is greater than the load

•the load moves further than the effort

•the lever can be considered as a distance magnifier
Fe = Fl dl / de (1)

where

Fe = effort force (N, lb)

Fl = load force (N, lb) (note that weight is a force)

dl = distance from load force to fulcrum (m, ft)

de = distance from effort force to fulcrum (m, ft) Big concept Equation Distance from Fulcrum to Effort Force Distance from Fulcrum to Load Force
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