High School Physics/Physics experiments
Force edit
Rubber bands, known weights
Electricity edit
Wheatstone bridge, resistors, various materials Rubber, metal, steel wool Electrochemical Cells High voltage, low capacitance "human" circuits. Parallel vs. series.
Heat edit
Simple Solar Cookers Temperature equilibrium Energy of common foods
Multi-subject projects Making a better mousetrap...car that is. Floating boats: making boats out of balsa and seeing who can get trough the 20 meter float. The green cannon: Using renewable energy to accelerate a tennis ball
Sound edit
Computer speakers Representation of waves Annoying music, characteristic waves.