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EA Physics Unit 4

Forces

TermDefinition
force A push or a pull (vector quantity)
free-body diagram A diagram showing all the forces acting ON an object.
inertia The tendency of an object to resist change in motion
net force The combination (sum) of all the forces acting on an object (taking into account direction with +/-)
equilibrium The state in which the net force on an object is 0.
weight A measure of the gravitational force exerted on an object. (May change depending on location in the universe.)
mass A measure of the amount of matter in an object. (Does not change anywhere in the universe.)
normal force A force provided by a surface in a direction perpendicular to that surface.
static friction The force that resists the initiation of sliding motion between two surfaces that are in contact and at rest.
kinetic friction The force that opposes the movement of two surfaces that are in contact and are sliding over each other.
coefficient of friction A (unit-less) number that is used to determine the strength of a frictional force between two surfaces
normal Perpendicular to the surface
acceleration A change in motion (From rest to moving, from moving to rest, etc. )
newton's 1st law (Law of Inertia) an object in motion tends to stay in motion & an object at rest stays at rest unless acted upon by a net external force.
newton's 2nd law The acceleration of an object is directly proportional to the net force on it, and inversely proportional to the mass of the object.
field force A push or pull in which the interaction occurs "at a distance" without visible contact between the system and the environment
contact force A force that is exerted only when two objects are touching.
newton's 3rd law For every action force there is an equal and opposite reaction force.
newton's 3rd law pair The two forces involved in N3L. For example, force of butt-on-seat and the equal and opposite force of seat-on-butt
net Total, sum, combination, the extra amount that is not cancelled by anything else.
Created by: ehansen_eak12
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