Kinematics is the branch of classical mechanics that describes the motion of bodies (objects) and systems (groups of objects) without consideration of the forces that cause the motion.
When we study the motion of a body, we always have to do it respect to a Reference System, which is a point or set of points through which we describe the movement that a body has.
We say that a body is moving respect to a Reference System when it changes its position over the time, if it doesn’t change, we will say that it is in repose. The movement is relative, that is, it will depend on the reference system we choose.
If we join all the points where passes a body, we obtain a curve called trajectory, on which we can determine the position of a point that after join it with OX and OY axes, we obtain as result a vector called position vector.
The length or module of that position vector is calculated by:
Scalar average velocity
Scalar instant velocity
Vectorial average velocity
Vectorial instant velocity
Rectilinear uniform motion
Rectilinear uniformly varied motion
Free fall motion
Uniform circular motion (T = period ; f = frequency)
Uniform circular varied motion
Vibratory harmonic motion (s = elongation ; A = amplitude ; ω = pulsation)
COMPOSITION OF MOVEMENTS
Vertical launch of projectiles
Horizontal launch of projectiles
Oblique launch of projectiles
You can download the App BioProfe READER to practice this theory with self-corrected exercises.