Motion {velocity}| involves going from one space position to another, over time. Velocity has speed and direction and so is vector. Instantaneous velocity v is distance change ds divided by time change dt: v = ds / dt. Average velocity v is position change s divided by time t: v = s/t.
Final velocity vf equals initial velocity vi plus constant acceleration a times time change dt during acceleration: vf = vi + a * dt.
Final velocity vf squared equals initial velocity vi squared plus two times constant acceleration a times distance over which acceleration applies ds: vf^2 = vi^2 + 2 * a * ds.
types
Translation is in straight lines. Oscillation is back and forth. Spin is around object axis or point. Orbit is around point or axis outside object. Spins and orbits are rotations. Electronic transition is from one orbit to another, in atoms or molecules.
examples
When it is raining, to be less wet, run through rain instead of walking, to hit more drops per second but for fewer seconds.
graph
If acceleration is zero, graph of velocity versus time is a horizontal line. If constant acceleration is positive, velocity versus time is a rising straight line. If constant acceleration is negative, velocity versus time is a falling straight line.
Physical Sciences>Physics>Kinetics
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Date Modified: 2022.0224