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100 Project Ideas (page 4)

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

Engineering

  1. What effect does the shape of an object have on its strength?
      Independent variable: Shape of object
      Dependent variable: Strength
  2. Which brand of antacid tablet is the best at neutralizing stomach acid?
      Independent variable: Brand of antacid tablet
      Dependent variable: Degree of neutralization
  3. Which brand of hair spray holds hair in place the longest time?
      Independent variable: Brand of hair spray
      Dependent variable: Holding time
  4. Which brand of toilet paper decomposes the fastest in water?
      Independent variable: Brand of toilet paper
      Dependent variable: Rate of decomposition
  5. Which brand of detergent has the most effect on stain removal from clothes?
      Independent variable: Brand of detergent
      Dependent variable: Degree of stain removal
  6. Which type of cloth is the most resistant to food stain?
      Independent variable: Type of cloth
      Dependent variable: Degree of resistance to food stain
  7. Which brand of shampoo produces the most lather?
      Independent variable: Brand of shampoo
      Dependent variable: Amount of lather
  8. What effect does borax concentration have on softening water?
      Independent variable: Borax concentration
      Dependent variable: Degree of water softness
  9. Which brand of washable colored markers does water most effectively remove from skin?
      Independent variable: Brand of washable colored markers
      Dependent variable: Degree of water solubility

Mathematics

  1. How does age affect the mean height of a group?
      Independent variable: Age
      Dependent variable: Height
  2. How does gender affect the mean height of a group?
      Independent variable: Gender
      Dependent variable: Height
  3. How does the height of a rain gauge affect the distance between scale measurements?
      Independent variable: Height of rain gauge
      Dependent variable: Distance between scale measurements
  4. How does the diameter of a rain gauge affect the distance between scale measurements?
      Independent variable: Diameter of rain gauge
      Dependent variable: Distance between scale measurements

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
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