Wednesday, September 16, 2015
9:18 AM
Units used in work problems:
Metric:
Force = mass acceleration
1 Newton (N) = 1 kilogram -meter/second^2
Work or energy = force distance
1 Joule (J) = 1 Newton-meter
Acceleration due to normal Earth gravity
= = 9.8 meters/second^2
Gravitational force on an object with mass is
English:
Work is measured in foot-pounds
Force is measured in pounds, where a pound of force is the gravitational
force on an object weighing 1 pound.
The density of water is 1000 kg/m^3 or 62.5 lbs/ft^3.
Typically the force is a function of distance which
must be integrated over some range.
Fabio's pool has a radius of 15 ft and a
depth of 8.5 ft and is filled to a depth of 6.5 ft.
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