Simple Machines for Kids: 10 Hands-On Experiments That Teach Physics (2026)

By Alex Kumar · May 28, 2026

Simple machines are the building blocks of all mechanical technology. By building and experimenting with levers, pulleys, wheels, inclined planes, wedges, and screws, children gain an intuitive understanding of physics principles.

The Six Simple Machines

Every complex machine — from cars to computers — is built from combinations of just six simple machines: lever, pulley, wheel and axle, inclined plane, wedge, and screw. Understanding these basics gives kids a foundation for all future engineering learning.

Experiment 1: The Ruler Lever

Materials: ruler, pencil, small heavy object (book), lighter object (eraser)

Place the pencil under the ruler as a fulcrum. Put the book on one end and try to lift it by pressing the other end. Move the pencil closer to the book — notice how it becomes easier! This demonstrates mechanical advantage.

Experiment 2: DIY Pulley System

Materials: string, empty thread spool, hook, small bucket

Hang the spool from a hook. Thread string through the spool and attach a bucket to one end. Pull down on the other end to lift the bucket. Try adding a second spool — does it take less effort?

Experiment 3: Inclined Plane Race

Build ramps at different angles using boards and books. Roll toy cars down each and measure distance. Steeper angles = more speed but less control. This is exactly how engineers design highways!