Motion and Gravity

The hypothesis which we accept ought to explain phenomena which we have observed, but it ought to do more than this: our hypothesis ought to foretell phenomena which have not been observed.

- William Whewell

Basic concepts, finishing chapter 2:
Momentum
Centripetal Force
Gravity
Orbit
Weightlessness

Summary of units used so far

You need to know these!
variable abbrev. unit formula
Distance d m (meter)
Mass m kg (kilogram)
Time t s (second)
Velocity v m/s d/t
Acceleration a m/s2 change in d/change in t2
Force F N (Newton) = kg m/s2 F=ma
Momentum p kg m/s mv
Force F N (Newton) = kg m/s2 F=mv2 / r
(centripetal) r = radius
Gravity F (force) N G*m1*m2/d2
G = gravitational constant


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