force - the push or pull on matter that enables that matter to CHANGE in motion (aka: accelerate) and interact; always present even when an object is not moving (balanced), net force - the sum of all the forces acting on an object, unbalanced forces - change the motion of an object; net force ≠0, balanced forces - do not change the motion of an object; net force =0, acceleration - ANY change in motion; can be in direction or speed; slowing down is considered acceleration as it is a change in speed, Newton’s First Law/Law of Inertia - objects will remain at rest OR in constant motion UNLESS acted on by an unbalanced force, inertia - RESISTANCE to change in motion, friction - RESISTANCE to motion against an object, Newton’s 3rd Law of Motion/Law of Action-Reaction - for every action there is an equal and opposite reaction; forces ALWAYS occur in pairs that are equal in magnitude and opposite in direction, Newton’s 2nd Law/Law of Mass and Acceleration - acceleration of an object is dependent upon two variables - the NET FORCE acting upon the object and the MASS of the object,

8th gr Force & Motion

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