motion, A change in an object’s position in respect to time and in comparison to other objects, kinetic energy, Energy of motion., speed, How fast an object’s position changes over time, potential energy, Energy that is stored in the position or condition of an object., energy, The ability to do work or to change an object. Units of energy are called joules (J), acceleration, The change in speed or direction of an object., friction, A force that opposes the motion of one object moving past another., force, A push or pull that causes an object to move, stop, or change direction., gravity, A noncontact force that acts over a distance and pulls all objects towards each other., inertia, The tendency of an object in motion to stay in motion or of an object at rest to stay at rest., magnetic force, The force between two magnets or between a magnet and certain metals. This force can push or pull., unbalanced forces, Forces that do not add up to zero. They change the motion of an object.The greater force determines the direction of motion., electrostatic force, A force that has to do with the charge an object carries. Opposite charges attract and same charges repel, balanced forces, Forces that act on an object without changing its motion. Balanced forces often point in opposite directions and always add up to zero., contact forces, A force that occurs when one object touches another., mechanical force, A push or pull that one exerts on a system’s state of rest or uniform motion.

Force and Motion

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