| angular momentum |  |
|
| apparent gravity |  |
|
| artificial satellites |  |
|
| comets |  |
|
 | | Coulomb's law |
|  | | electric current and power |
|  | | electric field intensity I |
|  | | electric field intensity II |
|
|
| electric potential and work |  |
|
| electric potential energy |  |
|
| equipotential surfaces |  |
|
| Evolution of stars |  |
|
 | | fixed stars |
|  | | free fall |
|  | | free fall in air |
|  | | gravitational potential energy |
|
|
| Kepler's laws |  |
|
| lines of force |  |
|
| lunar phases |  |
|
| mass and weight |  |
|
 | | Measurement of G |
|  | | measuring g |
|  | | Relative movement of the earth |
|  | | rotation of the earth |
|
|
| solar eclipse |  |
|
| the earth's orbit |  |
|
| The Milky Way |  |
|
| the movement of electric charges |  |
|
 | | The planets |
|  | | the principle of superposition I |
|  | | the principle of superposition II |
|  | | The shape of galaxies |
|
|
| The signs of the zodiac |  |
|
| The Solar System |  |
|
| The Solar System (II) |  |
|
| The solar system (theories) |  |
|
 | | the variable intensity of gravity |
|  | | tides |
|
