THE strength weight it is when gravity uses its acceleration to make the bodies approach in relation to the surface, this in vertical movement.
Applying this with the 2nd Newton's Law, if a mass body has an acceleration of its gravity, when applied to it, the fundamental principle of dynamics we can say that:
F = mg
This strength is called Strength Weight:
P = mg
The weight of a body means the strength of the earth when it attracts it. It can be variable when there is a change in gravity, that is, when we are not so close to the earth. But the mass of the body is constant with no variation.
Industry uses the unit for measuring kilogram-force:
1 kgf is the weight of a body of mass 1 kg that has been subjected to a gravity acceleration of 9.8 m/S(2):
P = mg
1kgf = 1kg. 9.8/S(2)
1kgf = 9.8kg.m/S(2) = 9.8N
There is also another force that acts in the vertical direction called the Normal force. This force happens through the surface on the body. It is identified when its resistance undergoes deformation due to the weight of the body.
The force acts perpendicular to the surface, unlike the Weight Force which always acts vertically. On a body under a flat surface, you can see the two forces acting.
In order for the body to be kept in balance vertically, without any alteration, it is necessary that the normal and weight forces are identical, in opposite directions they cancel each other out.
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