There is no subject so important as mechanics, as its principles are
founded upon the properties of matter and the laws of motion; and,
knowing something of these, the tyro will lay the foundation of all
substantial knowledge.
The properties of matter are the following: Solidity (or
impenetrability), divisibility, mobility, elasticity, brittleness,
malleability, ductility and tenacity.
The laws of motion are as follows:
1. Every body continues in a state of rest, or uniform rectilineal
motion, unless affected by some extraneous force.