# Vocabulario

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Speed
A scalar quantity that refers to how fast an object is moving.

Velocity
A vector quantity that refers to the rate at which an object changes its position.

Acceleration
The rate ofchange of velocity over time, is the rate at which something speeds up or slows down.

Projectile motion
An object upon which the only force acting is gravity.
An object that once projected ordropped continues in motion by its own inertia and is influenced only by the downward force of gravity.

Newton’s three laws of motion:
1) Every object in a state of uniform motion tends to remain inthat state of motion unless an external force is applied to it.
Example: The motion of a ball falling down through the atmosphere, or a mpdel rocket being launched up into the atmosphere are bothexamples of Newton's first law.

2) The relationship between an object's mass m, its acceleration a, and the applied force F is F = ma. Acceleration and force are vectors in this law the direction ofthe force vector is the same as the direction of the acceleration vector.
Example: If a 50 lb child pushes on an 80 lb box, the force would only be half that it would be if a 100 lb child pushed onan 80 lb box.

3) For every action there is an equal and opposite reaction.
Example: When a bullet is fired from a gun, the force sending the bullet forward is equal to the force sending the gunbackward. Due to high mass of gun, it moves only a little distance backward and gives a backward jerk of kick to the shoulder of the gunman.

Keepler’s three laws of motion:
1) The orbit of everyplanet is an ellipse with the Sun at one of the two foci.

2) A line joining a planet and the Sun sweeps out equal areas during equal intervals of time.

3) The square of the orbital period of aplanet is directly proportional to the cube of the semi -major axis of its orbit.

Law of universal gravitation
States that every massive particle in the universe attracts every other massive...