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### 20 Cards in this Set

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 air resistance th eopposing force created by objects moving through air equilibrium when forces in an object are balanced force a push, a pull, or any action that has the ability to change motion friction the force that results from relative motion between objects gravity the attractive force that exists between any two objects that have mass inertia the reluctance of a body to change its state of motion law of conservation of momentum as long as interacting objects are not influenced by outside forces, their momentum before the interaction will equal their momentum before the interaction mass a measure of the inertia of an object; the amount of matter in an object momentum mass times velocity net force the amount of force that overcomes another force to cause motion -force can be 0 if they are equal newton unit of force N Newton's 1st Law of Motion an object at rest will stay at rest and an object in motion will stay in motion unless acted upon by an outside force Newton's 2nd Law acceleration of an object is proportional to the force acting on it and inversely proportional to its mass Newton's 3rd Law every action has an equal and opposite re-action pounds English system's unit of force sliding friction resistance created when two surfaces rub against each other weight a force created by gravity difference between mass and weight mass never changes weight does rolling friction resistance created when one object rolls over another viscous friction resistance created by objects moving in water or other fluid