Real Science4Kids Physics Level 1 - Real Science 4 Kids Author:Rebecca W. Keller Real Science-4-Kids Physics, Level I, written at a 4th and 5th grade level, presents college level physics in a way children can understand. Concepts included are: Laws of physics and the scientific method; force, work and energy; potential and kinetic energy; motion; chemical and electrical energy; current, magnets and electromagnets; light a... more »nd sound energy; and conservation of energy.« less