determines if and how an object will accelerate|a force that pulls objects toward each other|a measure of the amount of matter in an object|a measure of the force of gravity on an object|resistance to change in motion|a characteristic of a moving object that is related to the mass and velocity of the object|Sir Isaac ......|acts opposite the direction of motion|a falling object that keeps missing the ground; (they orbit around Earth!)|motion where the acceleration is caused by gravity