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Acceleration Rate of change of velocity as acceleration. Acceleration= Change of velocity/time interval. Free Fall When air resistance doesn't affect the motion of a falling object. Force and Acceleration Acceleration is directly proportinal net force. The direction of acceleration is in the direct of net force. Mass Greater the Mass greater its inertia. Kilograms What mass is measured in. Difference between mass and weight Mass is the amount of matter in an object. Also, a measure of the intertia that an object shows when you try to change its state of motion. Weight is the force due to gravity that acts on an object's mass. Mass Resists Acceleration. Mass is inversely proportional to mass. Acceleration~ 1/mass. Newton's Second Law The acceleration produce by a net force on an object is directly proportional to the net force, is in the same direction as the net force, and is inversely proportional to the mass of the object. Acceleration= Netforce/Mass Air Drag Whan an object falls downward through the air, the force of friction (air drag) acts upward. Friction alwats acts in a direct to oppose motion. Terminal Speed The speed at which the acceleration of a falling object is zero because friction balances the weight Terminal Velocity The constant velocity of a falling object when the force of air resistance is equal in magnitude and opposite in direction to the force of gravity. Tangential Velocity the velocity tangent to the path of an object moving in a curved path. Law of Universal Gravitation The scientific law that states that every object in the universe attracts every other object. Force ~ (mass1)(mass2)/(D)(D) Inverse-Square Law Gravitational force varies inversely with the square of the distance between two objects Gravity F=G(m1*m2/d*d)