In the four special cases we have investigated so far:
work appears to behave differently in each one. Actually, of course, this is not the case. All four cases (and much more) can be calculated from a single equation (as long as the force is constant), which is:
Where:
(Why?) This equation fits the four special cases of motion as follows:
In this case, q = 0o, so:
In this case, q = 180o, so:
In this case, q = 90o, so:
In this case, Dx = 0, so: