If the content size is: 1024x600, an object with free fall gravity (gy=9.8) should fall after a second?
Example, the formula in real word (meter) is: d = 1/2 * g* t^2. If t=1s, then d=0.5*9.8*1 = 4.9m.
Similar to when applying a force, how to estimate how fast/far the object will be/travel for given density/friction?