Stress;
measured in SI units of Newtons per square meter (Ns^-2).
Although there are many variants of the units, called 'derived' units of measurement, specifically here, Pascals per square foot, etc.
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In mechanics, the force exerted upwards by the surface that a body sits on is equal and opposite to the force exerted downwards by that body and is referred to as the Ground Reaction Force (GRF) or simply Reaction.
input force is force exerted on a machine
... continue to do that, until a force is exerted on it.
change the direction of force,because it exerted the force on it.
your cired