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Free Science Fair Projects Database

Learn all about the moon, including moon phases, full moon dates, and enjoy the full moon countdown clock.
Search results for free science fair projects for 3rd Grade in All Categories:
Battery Power For grades 1 thru 4
Category: Chemistry
Hypothesis: More expensive batteries will last longer. Duracell will last the longest.
Primary Materials Used: Wires, Stop Watch, Light Bulbs, Several Different Kinds of Batteries, Battery Holder, Optional: High Speed Motor Fans, Jumper Test Alligator Clips
Click Here for more details about the "Battery Power" science fair project.


Electric Charge in Fruits and Vegetables For grades 3 thru 8
Category: Physics
Hypothesis: The potato will have the greatest charge.
Primary Materials Used: Various Fruits and Vegetables, Multimeter
Click Here for more details about the "Electric Charge in Fruits and Vegetables" science fair project.


Heat and Evaporation For grades 2 thru 7
Category: Earth Science
Hypothesis: The light bulb with the highest wattage will cause water to evaporate the fastest.
Primary Materials Used: Light Bulbs, Light Sockets, Cardboard Boxes, Duct Tape, Camera
Click Here for more details about the "Heat and Evaporation" science fair project.


How To Make An Egg Float For grades K thru 3
Category: Physics
Hypothesis: Adding four teaspoons of salt to a cup of water will increase the water's density so the egg will float.
Primary Materials Used: Measuring Cup, Egg, Salt, Water, Teaspoon
Click Here for more details about the "How To Make An Egg Float" science fair project.


SPLAT! Forming Craters and Predicting Their Size For grades 3 thru 7
Category: Space and Astronomy
Hypothesis: The size of a crater formed by an object's impact will be greater when the object is bigger and faster. The size of the crater will be predictable after enough data is collected.
Primary Materials Used: Plaster of Paris, Cake Pans, Ladders, Clamps, Kite String, Triple Beam Balance, Wood, Tape Measure
Click Here for more details about the "SPLAT! Forming Craters and Predicting Their Size" science fair project.


The Effect of Salt on the Boiling Temperature of Water For grades 1 thru 5
Category: Chemistry
Hypothesis: Adding table salt to water will cause the water to boil at a higher temperature.
Primary Materials Used: Table Salt, Distilled Water, 2 Quart Cooking Pot, Measuring Cup, Measuring Spoons, Thermometer
Click Here for more details about the "The Effect of Salt on the Boiling Temperature of Water" science fair project.


Tricky Dice For grades 3 thru 6
Category: Mathematics
Hypothesis: Rolling two dice, the sum will be 4 most often and high numbers like 10, 11, and 12 will come up the least.
Primary Materials Used: Dice
Click Here for more details about the "Tricky Dice" science fair project.


What Angle of Incident Light Striking a Solar Cell Produces the Most Electricity? For grades 3 thru 7
Category: Physics
Hypothesis: Solar cells facing the sun directly (at a 90 degree angle) will be the most efficient.
Primary Materials Used: Solar Cell, Multimeter, Music Stand, Source of White Light, Protractor
Click Here for more details about the "What Angle of Incident Light Striking a Solar Cell Produces the Most Electricity?" science fair project.