From graphs, pictures, or tables of position vs. time determine the average speed and direction for any interval of time. Newton's Second Law of Motion - The acceleration of an object is directly proportional to the unbalanced force acting on it and inversely proportional to the object's mass. The direction of the acceleration is the same as the direction of the unbalanced force. An object which is moving with constant speed in a straight line, has no unbalanced forces acting on it. Newton's First Law of Motion - Inertia is the natural tendency of an object to remain at rest or to remain moving at constant speed in a straight line.
Force is an interaction.
For every force exerted by one object on a second object, the second object exerts an equal force in the opposite direction back on the first object. 7.Gravitational force is an attraction between masses. The strength of the force is proportional to the masses and weakens rapidly with increasing distance between them. 8.The change in motion of an object is proportional to the applied force and inversely proportional to the mass. 9.All motion is relative to whatever frame of reference is chosen, for there is no motionless frame from which to judge all motion.