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Mechanics

Free online mechanics lesson for elementary school,  middle school and high school.
chemistry high school
 




















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Gravity

Weight of an object

 
1) What is weight ?

For an object on Earth we can define weight as follows:
Weigth is the gravitational action exerted by Earh upon this object.


The weight can also be defined for objects on other celestial bodies. For instance, on the Moon the weight is the gravitational action exerted by the Moon upon an object.
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2) Weight properties

- Axis and direction:
If an object is dropped it falls down along a vertical axis.
The weight has the same properties: it is exerted along a vertical axis oriented downwardly.
At the Earth's scale, the weight is exerted following the direction of terrestrial radius, toward its center.

The weight value:
The weight value is denoted W. It is expressed in newton ( symbol: N )

We can measure weight using a dynamometer.
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