Sample 4th Grade Science Fair Ideas

4th grade science fair projects typically would involve answering a question, solving a problem, or testing a hypothesis. Basically, a scientific investigation process is mandatory for 4th grade science fair projects. To assist the selection of an interesting project for 4th grade students, here is big list of sample science investigation questions for your reference.

1. Force and Motion:

Does the number of coils of wire in an electromagnet affect its magnetic strength?
Does voltage affect the strength of an electromagnet?
Does the weight of a permanent magnet affect its strength?
Does the height of a ramp affect the distance a toy car will roll?
Does the mass of a car affect the distance it will roll from the bottom of a ramp?
Does the material that the ramp is made of affect the distance a toy car will roll?
Does the distance a rubber band is stretched affect how far it will ?y when l released?
Does the amount of weight suspended from a rubber band affect how far it stretches?
Does the weight of a wooden block affect the force that it takes to drag it across a table top?
Does the height from which a rubber ball is released affect the height that it bounces?
Does the surface of the ground affect how far a ball will roll?
Does the amount of air (pressure) in a basketball affect how high it bounces?
Does the number of blades of a propeller affect how fast it will turn in the wind?
Does the angle of a wing affect the amount of lift it develops in the wind?
Does the number of pulleys affect the force necessary to lift a weight?
Does the length of a lever (from the fulcrum) affect the force necessary to lift a weight?
Does the length of a pendulum affect its period (time it takes to swing)?
Does the weight of a pendulum affect its period (time that it takes to swing)?

2. Heat and Temperature:

Does the temperature of the water affect how fast an Alka-Seltzer tablet will dissolve?
Does the color of water affect the time it takes to freeze?
Does the kind of water affect how long it takes to boil?
Does the kind of water affect how quickly it will evaporate?
Does the surface area of a container of water affect its evaporation rate?
Does the depth of the water affect its evaporation rate?
Does the temperature of water affect its evaporation rate?
Does the kind of material used to insulate a refrigerated can of soda affect its temperature change?
Does the color of a can affect its rate of temperature change when placed in the sun?
Does the kind of soil (sand, gravel, clay) affect its temperature change in the sun?
Does the color of a crayon affect its melting rate?
Does the temperature of a tennis ball affect how high it bounces when dropped?
Does the shape of an ice cube affect how slowly it melts?
Does the mass of an ice cube affect how slowly it melts?
Does temperature affect the density of a liquid?
Does the temperature of water affect the height at which an object ?oats?

3. Plants:

Does the type of fertilizer affect the height that a bean plant grows?
Does the amount of fertilizer affect the height that grass will grow?
Does the kind of water affect the number of leaves on a Marigold plant?
Does the size of a bean seed affect its germination rate?
Does temperature affect the germination rate of bean seeds?
Does the amount of sunlight affect the germination rate of radish seeds?
Does the amount of moisture affect the germination rate of pepper seeds?
Does temperature affect the height of petunias?
Does classical music affect the height of tomato plants?
Does the diameter of an apple affect the number of seeds inside?
Does the circumference of a pumpkin affect the number of seeds inside?
Does water drainage affect the height of sun?ower plants?
Non-Vertebrate Animals:
Does the type of surface affect the distance a meal worm travels?
Does the moisture of the surface affect the distance a meal worm travels?
Does the temperature affect the distance that a meal worm travels?
Does the amount of light affect the distance that a meal worm travels?
Does playing rock music affect the distance that a meal worm travels?
Does the number of earthworms in soil affect the germination rate of radish seeds?
Does temperature affect the number of “chirps” per minute that crickets make?
Does the color of light affect how far earthworms with travel?
Does the moisture of the surface affect the distance that an earthworm travels?
Does the color of light affect how many insects are attracted to it at night?

4. Earth/Space and Environmental:

Does the kind of soil affect the rate of water erosion?
Does moisture affect the rate of decomposition in a compost pile?
Does the slope of the surface affect the rate of water erosion?
Does the kind of soil affect how much water it will hold (retain)?
Does salt affect the freezing rate of water? Does wind speed affect the evaporation rate of water‘?
Does the rotation of the earth (time of the day) affect the length of a shadow?
Does the kind of water (fresh or salt) affect how long it takes an ice cube to melt?
Does the velocity of the wind affect the height of waves?
Does the direction of the wind affect the outdoor temperature?
Does the velocity of the wind affect the timing (high and low) of the tides?
Does barometric pressure affect the chance of rainfall?
Does the phase of the moon affect the height of the tides?
Does gravel affect the rate that sand erodes on a beach?