Some systems have less heat loss than others. Motion position, direction, and speed. Motion is change in position. Video Roller Coaster Physics 2 Force push or pull. Common forces are magnetism and gravity.
Motion is in the direction of the greatest force.
Greater force, greater acceleration. 1 Object in motion remains in motion unless acted upon by an outside force. Objects in rest remain in rest. Inertia - balance of forces. For every action, there is an equal and opposite reaction.