Science Fair

Grown-ups

Top 10 science fair projects for 7th and 8th graders

Every project on this list is one of Peabody's own, free, with the hypothesis, steps, results table and board plan on its page. Each has a second variable for middle school, in its Going further line.

How it's ordered: Projects that reach 8th grade first, then 7th; within each, the ones that start oldest, so the hardest lead.

The ten projects

  1. 🍶 Does a full bottle roll down a ramp faster? (ours): 5th–8th grade · 1 day of testing · free. A rolling bottle uses the energy of its fall for two jobs: moving forward and turning round.
  2. 📐 Does slanted light spread wider? (ours): 5th–8th grade · 1 day of testing · about $1. Light that hits a surface straight on is packed into a small spot, so that spot is bright.
  3. 🪀 Does a heavier pendulum swing faster? (ours): 5th–8th grade · 1 day of testing · free. Gravity pulls harder on a heavy weight, but a heavy weight is also harder to get moving, so the two cancel out.
  4. ➰ How much does a rubber band stretch with each extra weight? (ours): 5th–8th grade · 1 day of testing · free. A rubber band stretches more when more weight pulls on it.
  5. 🧂 Does warm water hold more salt than cold? (ours): 5th–8th grade · 1 day of testing · free. Water can only hold so much salt, and after that the extra just sits at the bottom.
  6. 🥶 Does a cold ball bounce lower than a warm one? (ours): 4th–8th grade · 1 day of testing · about $3. A ball bounces because it squashes against the floor and then springs back.
  7. 🧂 Does salty or sugary water change a bean plant? (ours): 4th–8th grade · 14 days of testing · about $2. A plant's roots pull in water, and the water carries minerals the plant needs.
  8. 🍞 Which bread turns the brownest in the toaster? (ours): 4th–8th grade · 1 day of testing · about $3. Toast turns brown when heat makes the sugars and proteins in bread join up into new, brown stuff, which scientists call the Maillard reaction.
  9. 💨 Where is it windiest around your home? (ours): 4th–8th grade · 3 days of testing · free. Wind is moving air, and it pushes harder on the open side of each cup than on its rounded back, so the spinner turns.
  10. 🍯 Do the heaviest liquids always sink to the bottom? (ours): 4th–8th grade · 1 day of testing · about $2. Density is how much stuff is packed into a space, so a quarter cup of honey weighs more than a quarter cup of water.

👨‍👩‍👧 For grown-ups and teachers: how much to help, the safety rules, and running a school fair. Science fair v0.16.1 · Checked .

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