The weight P and the mass m of an object are two quantities of different kinds and they are proportional. The relationship of proportionality is expressed by P = mg An object has: - An energy position close to the Earth; - Energy of motion called kinetic energy. Movement of a solid rotation around a fixed axis, angular velocity - An approach to Newton's laws applied to the center of inertia 1st law : The principle of inertia This principle is true that in some benchmarks These repositories are called Galilean.The sum of its kinetic energy of position and is its mechanical energy. The kinetic energy: the relationship giving the kinetic energy of a solid translation is: Ec = 1 / 2 m.v. The braking distance is growing faster than the speed. Second law : Appearance Semi-Quantitative comparison of the sum of the forces and the variation of the velocity vector of center of mass in a Galilean.Observing the reflection of a wave on a fixed obstacle; qualitative interpretation of the shape of the reflected wave. Wave: superposition of the incident wave and sine wave reflected from a fixed obstacle. Study of a uniform circular motion, velocity, acceleration vector, normal acceleration.
Geometric modeling of a thin lens convergent optical center, fireplaces, focal distance, vergence.
- Characteristics of the intermediate image and final image by building and / or application forms of conjugation. Gravitation governs the whole universe (solar system, stars and galaxies).
Remote action exerted by the Earth on an object in its neighborhood: weight of a body.
Orders of magnitude of distances from Earth to a few stars and galaxies in the Universe or duration of propagation of light corresponding.
- Sound travels in matter media (solid, liquid and gas) and it does not spread into space. Sounds too intense have implications for the hearing.