Biological
Plants
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How does the size of a pumpkin compare to the number of seeds in it?
How do different laundry detergents dissolved in water affect plant growth?
How does sugar water affect the growth of alfalfa seeds?
How do microwaves affect seed germination?
Are organic or inorganic fertilizers more effective?
How does the size of kidney bean seeds affect the rate of germination?
What is the effect of drought on the growth of different grass species?
How does temperature affect the rate at which seeds sprout?
How does the pH of water affect seed germination?
How does the amount of acid added to water affect the growth of a plant?
How does acid rain affect seed germination?
How does the type of bean seed affect the time it takes to germinate?
How does the amount of light/heat affect the germination of seeds?
How do different plants affect evapotranspiration rate?
How do different types of soil affect the growth of a geranium plant?
How does a different liquid added to a plant affect its growth?
How does adding different nutrients to a corn seedling affect its speed of growth?
How do different colors of light affect the growth rate of a tomato plant?
How does the type of soil affect the growth rate of a calendula plant?
How do different genres of music affect the growth of plants?
How does the type of "product" added to the soil affect a dill plant's growth?
How does the type of irrigation system affect the height and growth of a bean plant?
How do nutritional waters affect the growth of a lima bean plant?
How does the color of light affect the growth of a young balsam plant?
How do different types of water affect the germination of pinto beans?
How does the amount of fertilizer a plant receives affect plant height and weight?
How does the type of potato affect the hydroponic growth rate?
How does the temperature of water affect the growth rate of a black bean plant?
Animals/ People
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How does the concentration of salt in saltwater affect the hatching rate of brine shrimp?
How does vision affect your ability to balance?
Which organic food is the best ant repellant?
How do video games affect your reaction time?
How does talking on a mobile phone affect your ability to drive (using a video game)?
How does the color of humming bird “nectar” affect how much they consume?
How does the type of dog affect its paw preference?
How do different types of exercises affect heart rate?
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How do different exercises affect your heart rate going up or down?
How does a person's age affect lung capacity?
How do different color basketball nets affect the accuracy of a free-throw?
How does the amount of distance you have to run affect how far you jump?
Fungi (Yeast) /Bacteria/ Decomposition
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How does the concentration of bleach affect the amount of mold that can grow?
How does the type of bread /amount of moisture /amount of light affect the growth rate of mold?
Which type of natural cleanser is most effective at reducing bacteria colonies?
What effect does temperature have on the growth of common bacteria?
How does the cleaning treatment of a sponge affect the amount of bacteria on a sponge?
How do different types of light affect the growth of bacteria?
How does the length of time that you wash your hands affect how much bacteria stays on your hands?
How does temperature affect the growth of bacteria?
How do the parts of an egg affect bacteria growth at 74 degrees Fahrenheit?
How does the ratio of vinegar affect the growth of bacteria?
How do the variables that help the earth's soil affect the half-sliced apple's rotting speed?
How do different natural preservative slow down the amount of time in which a grape decomposes?
How does the amount of yeast used in a sour dough bread recipe affect the volume of the bread?
Physical
Evaporation
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How does the surface area of a container affect the amount of water evaporation?
How does the type of water salt/plain affect the amount of evaporation?
How does surface area affect the evaporation rate of water?
How does the type of substance added to tea affect its evaporation rate?
Newton’s Laws of Motion
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How does the weight of a car affect the distance it travels off a ramp?
How does the size of the parachute affect the time it takes to land?
Does the air pressure in a _________ ball affect how high it bounces?
Does the weight (or type) of ball affect how high it bounces?
Does the amount of air pressure in a bike tire affect how far the bike travels?
Does the size/hardness of a skateboard wheel affect how far it can roll?
Does the placement of weight on a skateboard affect the distance it can roll?
Does the design of a paper airplane affect how long it can stay in the air?
Does the type of paper affect how long it can fly in the air?
Does the weight of an object affect the speed of a parachute?
How does the spin of soccer ball affect its path?
How does the distance away from a hockey goal affect the accuracy of your shot?
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How does the position on basketball court affect the accuracy of the shot?
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How does age affect the Stroop Effect?
How does the placement of weight on a paper airplane affect its flight?
How does the mass of a ball affect the time it takes to land?
How does distance affect accuracy of a thrown football?
How does the height of which the bouncy ball is dropped affect the height it rebounds in the air?
How does weight affect the distance a bike will travel off a ramp if speed and distance are the same?
How does the length of a pendulum affect the period of its swing?
How does the weight of a ball affect the momentum gained from rolling down an inclined plane?
How does the weight of a person affect the distance of an air stomp toy rocket?
How does the angle of a ramp on a Hot Wheels track affect the distance the Hot Wheels car travels?
How does the type of balloon affect its distance traveled?
How do the materials of a ball affect how high the ball bounces?
How does the placement of weight on a toy car affect the distance it travels?
How do different types of electronic entertainment affect human brain speed in reaction and which does the
most damage?
How does the amount of distance you have to run affect how far you jump?
How does the angle of a football affect the height and distance of the football?
Engineering/ Flight (aerodynamics)
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How does the length of a bridge affect its ability to support weight?
How does the shape of a wing affect the amount of lift?
How does the wingspan of a paper airplane affect the distance it travels forward?
How does the type of paper affect its strength?
Does the shape of a parachute affect the time it takes to land?
How does the material used affect the distance a paper airplane flies?
How does the type of bridge affect how much weight a bridge can hold?
How does the height of a LEGO tower affect the frequency of the tower's collapse in an earthquake model?
How does the type of packaging material affect the amount of impact protection?
How do different types of materials affect the breakage of an egg?
Electricity
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How does the number of coils affect the strength of an electromagnet?
How will the amount of salinity affect electrical output?
Does the type of citrus affect the amount of electricity it conducts?
Does the type of battery affect how long it works?
How do different citrus fruits affect the amount of electricity generated?
How does the wattage of a light bulb affect the time it takes to evaporate water?
How does the type of citrus fruit affect the voltage produced?
How does varying voltage to a DC motor affect the revolutions?
How does the size of the bag affect the amount of mold on a piece of bread?
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How does light affect growth of bread mold?
How does the type of cheese affect the growth of mold?
How do different types of bread affect the growth rate of mold?
Waves (Electromagnetic and Radio)
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What materials block radio waves most effectively?
Water and Surface Tension
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How does temperature/amount of salt affect the surface tension of water?
How does the type of filter material affect the turbidity of runoff water?
Does pH affect surface tension?
How do differences in surfaces affect the longevity of a bubble?
Heat (Thermal)
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What effect does color have on temperature?
What effect does the material a mug is made of have on its ability to retain heat?
How does the temperature of a liquid affect its ability to hold dissolved gases?
How does the color of a material affect its ability to absorb heat?
How do different conductors affect the temperature attained in a hot dog chunk?
How does flavor affect the melting time for ice cream?
How does the type of wax affect a candle's burn rate?
How do different insulation materials affect the temperature of water in a container?
How does the type of cup affect how fast an ice cube melts?
How does the type of packaging material affect the amount of impact protection?
How do different types of materials affect the breakage of an egg?
How does color of a box affect the internal temperature?
Renewable Energy
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Does the angle at which the Sun's rays fall on a solar cell affect the power that's produced?
Does the angle at which the Sun's rays fall on a solar cell affect the power that's produced?
Do different light frequencies (colors) affect the output of a solar panel?
Does the length of a blade (or number of blades) on a wind turbine affect its energy output?
Does the type (design) of wind turbine affect its energy output?
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Crystals
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How does the type of sugar affect the amount of crystals grown under identical conditions?
What are the effects of temperature on the growth of crystals?
How does the amount of sugar dissolved in water affect the size of sugar crystals?
How does the type of sugar used affect the size of sugar crystals?
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How does the type of salt affect crystal growth?
How does the type of substance used affect the growth and height of a crystal?
Chemistry/ Solubility/ Density/ Food
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How does the pH of water and vinegar affect the volume of a shell?
How does the number of Mentos affect the height of the cola-geyser? (I know, I know!)
How do different products containing acids affect how quickly teeth/egg shells dissolve?
How does a type of substance affect the dissolve rate of jaw breaker?
How does the type of acid affect the height of bubbles produced?
How does the type of sugar used to bake a vanilla cupcake affect its volume?
How does changing the ratio of sugar to corn syrup affect the density of a marshmallow?
How does changing the kind of fat in a biscuit affect its softness?
How does the amount of water used to make a polymer affect the time it takes to slide down a 45 degree angle?
Earth/ Weather
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How does the time of day affect the salinity of sea water?
How does weather affect air pressure?
How does the type of soil affect how much water it can hold?
Adhesion
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How do differences in surfaces affect the adhesion of tape?