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EQUILIBRIUM
THE STATE IN WHICH THERE IS NO CHANGE IN THE MOTION OF A BODY
EQUILIBRIUM
THIS CONDITION EXISTS WHEN THE VECTOR SUM OF THE FORCES TENDING TO PRODUCE TRANSLATION OR MOTION IN A STRAIGHT LINE IS ZERO
EQUILIBRIUM
THIS CONDITION EXISTS WHEN THE ALGEBRAIC SUM OF THE MOMENTS TENDING TO ROTATE THE BODY IS ZERO
FREE-BODY DIAGRAM/FORCE DIAGRAM
IS AN ISOLATED VIEW OF A BODY WHICH SHOWS ONLY THE EXTERNAL FORCES EXERTED ON THE BODY
CONTACT FORCES, FIELD FORCES
THE TWO TYPES OF FORCES WHICH ACT ON A BODY
WEIGHT
THIS GRAVITATIONAL ATTRACTION ON A BODY BY THE EARTH DOES NOT HAVE A POINT OF CONTACT WITH THE BODY
DOWNWARD
THE DIRECTION OF THE WEIGHT VECTOR ALWAYS BE ASSUMED TO BE ___
FRICTION
REFERS TO THE RESISTANCE TO MOTION THAT OCCURS WHENEVER TWO MATERIALS OR MEDIA ARE IN CONTACT WITH EACH OTHER
FRICTION
MAY BE DEFINED AS THE CONTACT RESISTANCE EXERTED BY ONE BODY UPON A SECOND BODY WHEN THE SECOND BODY MOVES OR TENDS TO MOVE FAST
FRICTION
THIS RESISTANCE OCCURS IN ALL TYPES OF MEDIA: SOLIDS, LIQUIDS, AND GASES
STATIC, SLIDING (KINETIC), ROLLING
TYPES OF FRICTION BETWEEN SOLIDS
STATIC FRICTION
INCLUDES ALL CASES IN CHICH THE FRICTIONAL FORCE IS SUFFICIENT TO PREVENT RELATIVE MOTION BETWEEN SURFACES
SLIDING/KINETIC FRICTION
OCCURS WHEN THERE IS RELATIVE MOTION AT THE INTERFACE OF THE SURFACES IN CONTACT
ROLLING FRICTION
OCCURS WHEN ONE SURFACE ROTATES AS IT MOVES OVER ANOTHER SURFACE
