Fourth year of secondary education
The force of gravity
José Luis San Emeterio Peña
 F G 
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In this case, the body does not fall in a glass cylinder as we have not produced a vacuum.  This is a normal fall in the atmosphere.
Objectives of the teaching unit
Falling bodies
Free fall in a vacuum
Free fall in the air
Falling kinematics
Conclusions
The mass and weight of bodies
The weight of bodies
The difference between mass and weight
Conclusions
Measuring the intensity of g
A simple measuring device
g is not a true constant
Conclusions
Gravity beyond the earth
The force of the tides
The movement of satellites
The solar system
Conclusions
Evaluation