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The conversion factors for SI system are:

**h**hour

**min**minute

**hp**horse power

**cv**steam horses

**T**metric ton

**g**gram

**slug**slug

**km**kilometer

**cm**centimeter

**mm**millimeter

**mi**mile

**ft**feet

**in**inch

**km/h**kilometers per hour

**cm/s**centimeters per second

**mm/s**millimeters per second

**mph**miles per hour

**ft/s**feet per second

**in/s**inch per second

**kt**knot

**cm/s2**centimeters per squared second

**mm/s2**millimeters per squared second

**ft/s2**feet per squared second

**in/s2**inch per squared second

And for the English system are:

**h**hour

**min**minute

**hp**horsepower

**cv**steam horses

**kg**kilogram

**g**gram

**km**kilometer

**m**meter

**cm**centimeter

**mm**millimeter

**mi**mile

**in**feet

**km/h**kilometers per hour

**m/s**meters per second

**cm/s**centimeters per second

**mm/s**millimeters per second

**mph**miles per hour

**in/s**inch per second

**kt**knot

**m/s2**meters per squared second

**cm/s2**centimeters per squared second

**mm/s2**millimeters per squared second

**in/s2**inch per squared second

**lb/in**pound per inch

In this module, the forces (elements Force, Friction or Contact) are added to the objects (elements Block, Pulley or Spring) placing the force in one of the cells around the object. Each object (if there isn’t in the chalkboard’s border) have 8 cells around it. This module have 44 elements, presented below. With a description of each one, its data and its number of equations. Note that some elements have one or two equations, depending of the applied forces, or of the objects that interact with it.