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Ethics Study Guide
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, weight force a body exerts due to the pull of gravity
mass the measure of the amount of material in a body
weight= mass x velocity
objects are stable if lower com
large surface area
objects will topple if vertical line through the com falls outside the base
a moment is produced which causes the object to rotate
com is the point where all the mass of that object may be considered to be
balance at com because the moments on each side are equal
density is mass per unit volume
density= mass/volume
density tells us how closely the particles are packed
friction is a force that opposes motion
air resistance or drag occurs when the object moves through air or fluid
reduce friction by lubrication
changing the material or fluid
rollers
streamlining
friction acts in the opposite direction of the object
friction exists when two surfaces move over each other