Simple Balancing is an excellent and fun science project.
You will need:
2 light weight containers that are identical (butter tubs work well)
a hole punch or something that can poke holes in the containers
6 pieces of yarn or string cut the same length
and a hanger
Carefully punch 3 holes equal distance around the rim of each container. Thread the yarn thru each hole and tie in a knot leaving equal amounts of yarn on each container. Tie and knot the three pieces onto the hanger do this with both containers one on each side of the hanger.
This will create a simple balancing scale. Hang the scale from a hook or door knob ( the scale cannot be leaning against anything for more accurate results).
Once the scale has been completed have the students compare objects weight. Which item is heaviest? Lighter? Weighs the same? Also use ‘prediction’ as well. Graphing the results adds another dimension to this fun activity.