Describes activities designed to discover what the fluid is in bubble lights used on Christmas trees. Also describes activities using soda straws (to make music and to make smoke). (JN)

Recommends an experiment which will help students experience the physical evidence that floors, tables, and walls actually bend when pressure is exerted against them. Set-up includes: laser, radio, solar cell, and wall-mounted mirror. When the beam is moved by pressure on the wall, participants can "hear the wall bend." (DH)

Describes three demonstrations/activities that involve forces: (1) a canoe-like boat made from copper window screen; (2) magnetic forces with a paper clip and ceramic magnetic; and (3) an "icemobile" machine that cuts ice cubes without an obvious source of energy. (DH)

Shows how an electric stud finder (available from hardware stores for $15-20) is used to detect changes in capacitance produced by changes in thickness of a medium or in dielectric constant. Also describes how to construct an inexpensive motor from a battery, rubber bands, ceramic magnet, and copper wire. (DH)

Introduces a demonstration kit for understanding conductivity by using several fruits and vegetables. Provides a parts list and assembly instructions for the "lemon screamer." (YP)

Shows how a baseball having a built-in clock can be used for measuring ceiling height. Suggests other questions to investigate. (YP)

Describes an activity which demonstrates standing waves in air generated by a loudspeaker driven by an audio oscillator. The waves are detected by cool spots on a glowing nichrome wire contained in an inexpensive piece of equipment. Also describes activities involving analysis of kinematics through data taking and graphing. (JM)

Presents examples of physics activities using common objects such as a tuning fork, umbrella (for double diffraction patterns), and a toy car. Provides questions designed to stimulate student curiosity/interest and which provide models for developing additional units on everyday objects and toys. (JM)

Suggestions are provided for demonstrating vector cross product and vector dot product using manipulatives. Also provides a method for producing quick and inexpensive diffraction slits and ideas for demonstrating two-dimensional diffraction. (JM)

Students are challenged to investigate a simple electric motor and to build their own model from a battery, wood block, clips, enameled copper wire, bare wire, and sandpaper. Through trial and error, several discoveries are made, including a substitute commutator and use of a radio to detect motor armature contact changes. (DH)

The first demonstration shows rolling balls on two tracks: one is straight and the other dips down and then comes back up. Discusses the reason why the former is slower than the latter. The second demonstration shows a rising cork inside a water tube flowing downward. (YP)

Describes three physics demonstrations: "Sticky Kinematics," dealing with motion in friction; "The Whistler," presenting a whistle-like sound of descending pitch from an iron spring; and "Magnetic Superconducter Mystery," generating a question why a magnet keeps spinning. (YP)

Provided are activities focusing on phenomena associated with rotation of a double wheel (two bicycle wheels mounted on a common axis and free to rotate independently of each other) and on the operation of an electromagnetic toy car. (JN)

Materials needed and procedures for conducting two activities are provided. The first investigates drops of a liquid which float on water in a watchglass resting on top of a loudspeaker. The second investigates electromagnetic phenomena. (JN)

Describes an activity in which two pulleys are connected by a wire loop; when the bottom pulley is dipped into hot water, the pulleys rotate. Also suggests that students design/build a machine to propel a bean; the machine must use materials including one bean, two plastic straws, and two rubber bands. (JN)