Gears can be used to change the direction of a motor output from clock wise to counter clockwise
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No force contributes to density, the density is a physical quantity that is defined as being 
the raport between the mass of the object and its volume. However if you want to measure the density of an object you might want to determine its gravity force (weight) 
from which knowing the gravitational acceleratin you can find its mass 
where
is given in Newtons and 
is given in 
where