@inbook{10.2307/j.ctt7sgcs.10,
ISBN = {9780691129495},
URL = {http://www.jstor.org/stable/j.ctt7sgcs.10},
abstract = {Gravity sucks! If you drop something, it will fall. The gravitational acceleration at the surface of the Earth isg= 10m/s².*This means that a falling object will increase its speed by 10 ms (about 20 mph or 36 kph) every second. If you fell for 5 s, you would hit the ground at 50 ms or 110 mph or 180 kph. Ouch!gis also the gravitational force (measured in newtons (N)) exerted on an object of mass 1 kg (1 kg is about the mass of 2 lb) at the surface of the Earth. Thus, a 1-kg},
bookauthor = {Lawrence Weinstein and John A. Adam},
booktitle = {Guesstimation: Solving the World's Problems on the Back of a Cocktail Napkin},
pages = {113--144},
publisher = {Princeton University Press},
title = {Energy and Work},
year = {2008}
}