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This Concept Map, created with IHMC CmapTools, has information related to: Why Do Things Move Group 4, A car going with a constant velocity stays in motion, till an unequal force acts upon it Inertia, Universal Law of Gravity Explains the laws of gravity. Gravity, Net Force What causes an object's velocity to remain constant. An object's velocity will remain constant, unless you have a net force., Newtons First Law Newton's First Law is the law of inertia. Inertia, An object in motion tends to stayin motion, unless an unbalanced force acts upon it the definitions of Newtons First Law, Force Force can be measured by doing mass multiplied by acceleration F=ma, Mass The amount of substance, that the object accelerating has. Newton's Second Law, Mass Mass is measured in newtons. Newtons, An object at rest tends to stay at rest unless an unbalanced force acts on it the definitions of Newtons First Law, Acceleration Due to Gravity Acceleration due to gravity is the effect gravity has on the acceleration. Acceleration, Air Resistance When skydiving, the force of gravity pulls you down, and air resistance opposes this force. Gravity, Gravity An attractive force that pulls things to the earth. Newton's Second Law, Acceleration How you calculate acceleratoin. a=F/m, Skydiving When skydiving, the force of gravity pulls you down, and air resistance opposes this force. Gravity, A ball in fee fall A ball in free fall, or any object, accelerates at a rate of -9.8 m/s2. Acceleration, Acceleration is the speed rate at which objects move, and objects byde by this to follow this law. Newton's Second Law, Force what is applied on objects for htem to accelerate Newton's Second Law, units The units for acceleraton. m/s2, Mass of Object 2 Mass 1 and 2 have the same weight, but different masses. Mass, Force When forces are balanced, the acceleration is zero. Balanced