Fourth year of secondary education
The force of gravity
José Luis San Emeterio Peña
 F G 
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The movement of satellites

Not only do the sun and moon have a gravitational effect on the earth, our planet also exerts its attraction on all types of distant heavenly bodies.

 

  An interesting application of knowledge of the earth's gravitational field has been the creation of artificial satellites.  Once they have been put into orbit with the necessary velocity and height, the force of gravity keeps them there. 
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