1. Gear ratio calculations in mechanical systems, moment calculations in levers, and force applications in opening mechanisms. 2. Density comparison of liquids using mass-volume relationships, experimental data interpretation, and graphical analysis. 3. Light-dependent resistor (LDR) resistance variation, circuit construction for resistance measurement, and experimental accuracy improvements. 4. Gas expansion effects on marshmallows, air pressure variation in a fish tank, and Boyle’s law applications. 5. Ultrasound wave behavior at material boundaries, medical imaging applications, and eye measurement calculations. 6. Efficiency comparisons of light bulbs, environmental impact assessments, and energy consumption cost calculations.