Fourth year of secondary education
The force of gravity
José Luis San Emeterio Peña
 F G 
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     By looking at phenomena known to everyone, like

the motion of bodies in free fall, or object's weight, we will understand

the general notion of gravitational field. 

   We will then try to use this notion to explain more complex

phenomena, like tides, the orbit of satellites around

the earth or the orbit of the planets around the sun.

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