Acceleration And G Forces
It would be technically incorrect to look at the term g-force as force, as it is not force but a measure of acceleration. The main focus of this page is to look into acceleration and G forces. Read on.
It is interesting to note here that while acceleration is a vector quantity, g-forces are often expressed as a scalar. G-force can also be expressed as vector acceleration, with the positive g-forces working towards the bottom of a vehicle and negative forces towards the top. G forces, when multiplied by a mass upon which they are acting, are related to a certain type of mechanical force. It is this force which creates compressive stress and tensile stress. For example, in the case of is vertically upward G-force, applied by the ground or the floor of an elevator to a standing person, most of the body will feel compressive stress. This stress at any height, if multiplied by the area, is the related mechanical force, which is the product of the g force and the supported mass. Read on to get more details on g forces and acceleration.
At the same time, the arms will experience a tensile stress, which at any height, if multiplied by the area, is again the related mechanical force, which is the product of the g-force and the mass suspended below the point of mechanical support. It is seen that for a given g-force the stresses are the same, in spite of of whether this g force is a result of gravity, acceleration, or a combination. Hence, for people it will feel exactly the same.
Another standard example of negative g-force is in am accelerating fully inverted roller coaster, toward the ground. Here the roller coaster riders are accelerating toward the ground at a much higher speed than gravity. They are thus fastened upside down in their seats. Here, what is happening is that the mechanical force exerted by the seat alters the path of the passenger downward in a way which is different from gravitational acceleration. This difference in downward motion, which is now faster than gravity results in a g-force toward the ground.