In transformation, energy changes produce heat as a byproduct. 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.