FORCE: is any cause capable of deforming a body Changing its state of rest or motion.
MOTION: is a change of position of a body over time With respect to the reference system which is considered fixed.
We need to choose a body or a place which we consider To be permanently fixed. This body or place is called the reference system and the body which moves is referred to as a mobile.
Position: location of the mobile object in space with Respect to the reference point.
Displacement: the distance in a straight line between Two positions of the mobile object.
Space covered: the distance covered by the mobile Object on the trajectory.
Trajectory: an imaginary line joining the positions Which the mobile object goes through.
Linear motion: a straight-line trajectory.
Circular motion: a curve trajectory.
VELOCITY: is the distance/space covered by a mobile Object in the time.
FORCE OF FRICTION: is a force opposing motion, which Is produced by the interaction between the surfaces of two bodies which are in Contact.
The astronomical unit: is the average distance between The Earth and the Sun. Equivalent to 149 000 000 000 m. Used to measure Distances within the solar system. (au)
The light year: distance travelled by light in a Vacuum in one year. Equivalent to 9 460 000 000 000 000 m. It´s used to measure Distances between galaxies and clusters.
MASS: is the amount of matter in a body.
WEIGHT: is the force with which the Earth attracts a body