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.
A mass of 10 kg falls from a height of 45 metres to ground level. Calculate:- a). The initial P.E. of the body b). The K.E. of the body as it hits the ground c). The velocity of the body as it hits the ground (Take g = 9.81 m/s2) a).PE = mgh = 10kg x 9.81m/sÂ² x 45m = 4414.5 J b).As energy can neither be created nor destroyed, as the body falls and speeds up, the PE changes to KE.ts velocity = 15m/3s= 5m per 1 second (5m/s) Thus in 1 second it travels 5m. SO-at that Velocity it would travel in 4 seconds (4sx(5m/s)) = 20m. Note how the seconds cancel out leaving metres.