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Formulary Force

Different weight around the earth.

Spring balance

The acceleration of a body required to force is derived from its mass and the achieved acceleration. In the case of weight-force, the gravitational force, which has the same value everywhere, is applied and acts with a vertical downward force. An object falls at a speed of 9.81 m/sē and is generally rounded off to 10 m/sē. The force can be expressed by an arrow. It is clearly defined by the application point, the line of action the direction and the size. The size is represented by the length of the arrow.
The gravitational force is always directed toward the center of the earth. It is clear that from the varying distance of the earth's surface to its center,that the gravitational force, in contrast to mass at the poles, is at its highest and lowest directly on the equator. On the surface of the moon, which has one sixth of the earth's mass, the gravitational force would be six times as high. The gravitational force is measured e.g., using a spring balance. Its unit is Newtons (N). 1 N means that in one second 1 kg will accelerate at 1 m/s.

Even if a body expands when heated, its mass remains the same.

F = m · g

m =

gGravitational acceleration

Check your calculation!     You need help?
Please enter numbers only in one of the two fields!
m Mass g kg
g Force of gravity 9,81   m/sē
F Force (weight) N kN
Places behind the comma: 2 3 4 5


Var. set:

m = 2300 kg;

Var. asked for:

F in N


F = m · g = 2300 kg · 9,81 m/sē = 22563 N

The Identifier remains static, the unit rotates.

The force is also described as a vectorial value, because not only its absolute amount is important. If two forces have the same (effective) direction, they can be both added or subtracted according to the value, if they are directed exactly against each other.

1Application point

If the two forces have different directions, the result is summarized through a forces-parallelogram. This is precisely how a force can be divided, if both force-directions are specified. In the above diagram, one can also see, that nothing changes, if the application point is moved along efficiency line.

Here you can see the effect that the two forces have on the value (length) of the result. The more the two forces pull in the same direction, the greater the effect is. 08/11

A strange experiment: The right hand vehicle has an engine, which through the winding in of the rope to the left hand vehicle, shortens the distance between the two. The question is, which vehicle moves which?
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Translator: Don Leslie - Email:

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