This minicourse was prepared for use with secondary physics students in the Dallas Independent School District and is one option in a physics program which provides for the selection of topics on the basis of student career needs and interests. This minicourse was aimed at providing students with an understanding of some basic physics principles by playing with toys that have been classified into five different groups on the basis of the principle that each demonstrates. The minicourse was designed for independent student use with close teacher supervision and was developed as an ESEA Title III project. A rationale, behavioral objectives, student activities, and resource packages are included. Student activities and resource packages involve experimenting with toys that demonstrate force and motion, heat and thermodynamics, wave motion and sound, the principles of light, and electricity and magnetism. (GS)