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Newton's laws are often stated in terms of point or particle masses, that is, bodies whose volume is negligible. This is a reasonable approximation for real bodies when the motion of internal parts can be neglected, and when the separation between bodies is much larger than the size of each.
A unit of volume of lumber, defined as the volume of a board or plank of wood that is one foot long, one foot wide, and one inch thick, i.e. 12 in × 12 in × 1 in (305 mm × 305 mm × 25.4 mm), which is equivalent to 1 ⁄ 12 of a cubic foot (ft 3), 144 in 3, or 2,360 cm 3.