2nd year of post-compulsory secondary education
Gravitational fields
José Luis San Emeterio
 GRAVF 
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Presentation of the unit

   According to the legend, the fall of an apple inspired Newton to create the theory of gravitation. No such thing ever happened.

    The toilsome development of modern physics in the seventeenth century, which was often obstructed by prejudice and by different interests, finally culminated after a long process in the theory of gravitation.

    It was the first body of physical theory developed according to our present conception. This is why the study of this subject is especially interesting.

   Furthermore, the law of universal gravitation has allowed the human race to begin to understand the cosmos in which we live.

  Click on Next to see the objectives of the unit. 
    

 

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Ministerio de Educación, Cultura y Deporte

Historical background
Freely falling bodies
Two theories of the universe
Kepler's laws
Conclusions
The force of gravity
Newton's law
The superposition of forces
Angular momentum and central force
Conclusions
Field intensity
The concept of field intensity
Variations according to position
Conclusions
Energy in the gravitational field
Gravitational potential energy
Equipotential surfaces and lines of force
Conclusions
Some consequences of the theory
Explanation of the tides
The movement of artificial satellites
Coherence of galaxies
Conclusions
Evaluation