balanced forces - When the sum of the forces acting on an object are equal the object will remain at rest, or it will move at a constant velocity., force - A push or pull., net force - The sum of all the forces acting on an object., Newton's 1st Law of Motion - An object at rest remains at rest unless an external unbalanced force acts on it; an object in motion remains in motion unless an external unbalanced force acts on it., Newton's 2nd Law of Motion - An object accelerates in the direction of the net force acting on it., Newton's 3rd Law of Motion - For every action, there is an equal yet opposite reaction., unbalanced forces - When the sum of the forces acting on an object are not equal, the object will accelerate or decelerate., free body diagram - A figure used to visualize the forces acting on an object in a given condition., contact force - A push or pull transmitted across objects touching one another; examples are the applied force, spring force, and the normal force., friction - A force that resists motion., gravity (Fg) - One of the four fundamental forces of the universe; is exerted by anything that has mass on anything else that has mass., newton (N) - A derived unit of measurement for force; one newton is equal to one kilogram times meters divided by seconds squared (kgm/s2)., normal force (Fn) - The support force exerted upon an object by a surface; is always perpendicular to the surface., weight (w) - The force due to gravity acting on an object; equal to the mass of an object multiplied by the acceleration due to gravity on Earth., coefficient of friction (µ) - A ratio of the amount of resistance between two objects., static friction (Fs) - Friction that occurs when two objects are at rest relative to each other., kinetic friction (Fk) - The slowing force between two objects moving past each other; one object, or bother, can be moving., action-reaction pairs - Pairs of objects in which one object exerts a force, known as the action, on another object, and the other object reacts to that action in a way in which the force is equal in magnitude but opposite in direction., air resistance - The frictional force that air exerts on objects; also known as drag, Fd., terminal velocity - When the force due to gravity equals the force due to air resistance acting on a falling object and the object stops accelerating and moves at a constant velocity.,

Forces Review

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