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### 15 Cards in this Set

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 friction resistance to motion (force) translatoinal equilibrium sum of all forces ating on 1 object equals 0 static friction force required to get an object moving frictional force proportional to the normal force sliding friction (kinetic) force required to help an object moving force produces changes in motion balanced force net force = zero newtons 3rd law of motion for every force (action) there is an equal and opposite force (reactoin) normal force a contact force exerted by an object on another in a direction perpendicular to the surface of contact coefficient of friction depends on type/nature of both surfaces -unitless unbalanced force nonzero net force results in acceleration in the direction of unbalanced force net force sum of all forces acting on a body inertia the tendancy of a body to resist changes in its motion -->mass is a measure of inertia<-- newtons 1st law law of inertia -a body of rest remains at rest and a body of motion remains in motion w/ constant velocity newtons 2nd law acceleration of object is directly proportional to the NET force and inversly proportional to its mass. direction of acceleration is in the direction of applied net force.