The Zimbabwe Secondary School Science Project (ZIM-SCI) developed student study guides, corresponding teaching guides, and science kits for a low-cost science course which could be taught during the first 2 years of secondary school without the aid of qualified teachers and conventional laboratories. This teaching guide, designed to be read in conjunction with the related student guides, includes instructional strategies, lists of required materials, laboratory procedures, and other information for two units dealing with various aspects of forces and of forces associated with living things. Major areas investigated in the two units include: forces and changes they cause; measurement of forces; machines; power; and energy converters (Unit H1) and three main forms of support in plants; three main skeletal types in animals; limbs in animals as machines (muscles exerting a force on bone which acts as a lever); and protective functions of various skeletal parts (Unit H2). Each section in this guide corresponds to given sections in the student guides. (JN)