Operational Definitions/Measurement System Analysis. The focus for this month is on operational definitions. Operational definitions are one key to good data collection. They are a necessary, although not sufficient, condition for good data collection. Plus, we will look at how control charts can be used to evaluate the measurement system.
Air resistance induces a drag force on any body that falls through any atmosphere other than a perfect vacuum, and this drag force increases with velocity until it equals the gravitational force, leaving the object to fall at a constant terminal velocity.
At the peak of the trajectory, a vertically thrown object has gravity acting on it (accelerating it downwards at 9.8 m/s/s) while its velocity is zero. A simple example using calculus also suffices. which has zero velocity at [math]t=t_0[/math] and non-zero acceleration at [math]t=t_0[/math].