MECHANISMS
mechanisms are devices that transmit and convert forces and motions from a driving force input to an output elemnt. they enable us to carry outcertain tasks with greater comfort and less effort
driving force
mechanisms
output elemnts
classifications of mechanisms
to transmit of motion
to convert to motion
linear motion
rotary motion
rotary to reciprocating
rotary to linear
linear motion mechanisms
lever: lever is balanced when the effort f multiplied by its distance d is equal to the load R multiplied by its distance for the fulcrum r.
types of levers
class 2
class 3
class 1
the load and the effort are on opposite sides of the fulcrum
the load is between the effort and the fulcrum
the effort is between the effort and the fulcrum
fixed pulleys
a fixed pulley is balanced when the effort, f, is equal to the load, R. F=R
moveable pulleys
A moveable pulley is balanced when it fulfis this equation F=R/2
compond pulleys
this is a set of fixed and moveable pulleys often called a block and tackle.
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