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# 100 Project Ideas (page 5)

By John Wiley & Sons, Inc.
Updated on Feb 15, 2011

### Physics

1. How does the length of the string of a stringed instrument affect pitch?
Independent variable: String length
Dependent variable: Pitch
2. How does the thickness of the string of a stringed instrument affect pitch?
Independent variable: String thickness
Dependent variable: Pitch
3. How does the volume of water in a glass bottle affect the pitch of the sound produced when the bottle is struck?
Independent variable: Volume of water
Dependent variable: Pitch
4. How does the volume of water in a glass bottle affect the pitch of the sound produced when air is blown across the mouth of the bottle?
Independent variable: Volume of water
Dependent variable: Pitch
5. How do the number of coils in a solenoid affect the strength of an electromagnet?
Independent variable: Number of coils in a solenoid
Dependent variable: Magnetic strength
6. What effect does the intermittent use of a dry-cell battery have on its life?
Independent variable: Time intervals of use of a dry-cell battery
Dependent variable: Length of life of a dry-cell battery
7. What effect does the type of material charged have on the time it holds a static charge?
Independent variable: Type of material
Dependent variable: Time of holding a static charge
8. What effect does humidity have on the strength of a static charge?
Independent variable: Humidity
Dependent variable: Strength of a static charge
9. What effect does temperature have on the strength of a static charge?
Independent variable: Temperature
Dependent variable: Strength of a static charge
10. Which brand of battery lasts the longest?
Independent variable: Brand of battery
Dependent variable: Time to discharge the battery
11. What effect does the wattage of a lightbulb have on the amount of light it emits?
Independent variable: Wattage of lightbulb
Dependent variable: Amount of light
12. What effect does the number of strokes of a magnet on a nail have on the degree the nail is magnetized?
Independent variable: Strokes of a magnet on a nail
Dependent variable: Degree of magnetism
13. How does the position of the fulcrum in a first-class lever affect the weight it can lift?
Independent variable: Fulcrum position
Dependent variable: Weight lifted
14. How does the position of the fulcrum in a first-class lever affect the force needed to lift an object?
Independent variable: Fulcrum position
Dependent variable: Force applied
15. What effect does temperature have on the elasticity of a rubber ball?
Independent variable: Temperature
Dependent variable: Elasticity of a rubber ball (measured by the height the dropped ball bounces)
16. What effect does the amount of a lubricant have on friction between a marble rolling down a wooden incline?
Independent variable: Amount of lubricant
Dependent variable: Amount of friction
17. What effect does the temperature of a lubricant have on friction between a marble rolling down an incline?
Independent variable: Temperature of lubricant
Dependent variable: Amount of friction
18. What effect does the diameter of a string have on its strength?
Independent variable: String diameter
Dependent variable: Strength (measured by supporting weight)
19. What effect does the number of fibers in a string have on its strength?
Independent variable: Number of fibers
Dependent variable: Strength (measured by supporting weight)
20. What effect does the thickness of plastic have on the weight it will hold?
Independent variable: Thickness of plastic
Dependent variable: Weight supported
21. How does wing shape affect flight distance of a glider?
Independent variable: Wing shape
Dependent variable: Flight distance
22. What effect does the viscosity of a fluid material have on the buoyancy of an object in it?
Independent variable: Fluid viscosity
Dependent variable: Object buoyancy
23. What effect does the density of an object have on its buoyancy in water?
Independent variable: Object density
Dependent variable: Object buoyancy in water
24. In what type of light is fluorescent ink most effective?
Independent variable: Type of light
Dependent variable: Effectiveness of fluorescent ink (measured by brightness)
25. What effect does the size of a prism have on the spectrum produced?
Independent variable: Prism size
Dependent variable: Spectrum
26. What effect does the type of metal have on conducting heat?
Independent variable: Type of metal
Dependent variable: Rate of heat conduction
27. What effect does paint color have on its colorfastness when exposed to solar energy?
Independent variable: Paint color
Dependent variable: Degree of fading in sunlight
28. What effect does the mass of an object have on momentum?
Independent variable: Mass of object
Dependent variable: Momentum