Projects matched to 9th grade (ages 14–15) from the library's high school collection, at the difficulty tier that fits this year. Every one lists its materials, time, cost, safety notes and the variables to control.
108 published projects in this collection
Ninth grade mixes students arriving from very different middle schools. These high-school projects are the most approachable in that library — proper controls and repeated trials, without a long build or specialist equipment — a fair first step into judged high-school science.
Each project page carries an at-a-glance panel with a cost estimate, a realistic time estimate, the hazards involved and whether adult supervision is required, so you can check suitability before any materials are bought.
By subject
By school level
By difficulty
Preparing for a fair? Read the science fair guide or record your data in the lab.
They are filtered from the library's High School collection at the difficulty tier that fits 9th grade. The wider school-level collections are linked under "By school level" on this page.
A clear question, a hypothesis written before testing in if… then… because form, one independent variable with the rest controlled, at least three trials at each setting, and a conclusion that follows the data.
A research question and hypothesis, the independent and dependent variables, the variables to hold constant, a full materials list with costs, numbered steps, safety guidance and a data table you can fill in as you test.
It varies, so every project page states a cost estimate and a realistic time estimate up front. You can rule a project in or out before buying anything.
Some do. Every project lists its hazards and whether adult supervision is required in an at-a-glance panel on its page, so you can check suitability before you start.