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Centripetal Force center-pulling force that keeps an object moving in a circle. Newton's First Law of Motion the tendency of an object at rest to remain at rest or an object in motion to stay in motion at a constant velocity until an unbalanced force acts on it. Inertia the property of an object to resist a change in motion. Latin meaning "lazy" Acceleration Vector shows direction object is accelerating when moving in a circle Force Vector shows the direction of the force that keeps an object moving in a circle Velocity Vector shows direction object would travel if centripetal force were eliminated Mass the amount of matter in an object inertia is dependent on mass - the more mass, the more inertia Acceleration a change in velocity speeding up, slowing down or changing direction