A domino chain reaction is a fun school project that turns a simple line of standing dominoes into a moving science demonstration. When the first domino is pushed, it transfers energy to the next domino, then the next, until the whole path falls. Adding ramps, turns, and trick stations makes the project more creative while showing how energy moves through a system.
This project matters because it helps students see physics in action using safe, everyday materials.
Each standing domino stores gravitational potential energy because its center of mass is raised above the table. A small push gives the first domino kinetic energy, and collisions pass that motion along the chain. Ramps can change the height and speed of rolling objects, while turns and spacing affect whether the reaction keeps going.
By testing and improving the setup, students learn how engineers design systems that work reliably.
Key Facts
- Potential energy is stored energy, and a standing domino has gravitational potential energy before it falls.
- Kinetic energy is energy of motion, and a falling domino has kinetic energy.
- Energy transfer happens when one falling domino pushes the next domino.
- A good starting gap is about half the height of one domino between neighboring dominoes.
- Speed = distance ÷ time, so a chain that covers 3 m in 6 s has a speed of 0.5 m/s.
- On a ramp, gravitational potential energy changes as height changes: PE = mgh.
Vocabulary
- Chain reaction
- A chain reaction is a series of events where one event causes the next event to happen.
- Potential energy
- Potential energy is stored energy that an object has because of its position, shape, or condition.
- Kinetic energy
- Kinetic energy is the energy an object has because it is moving.
- Collision
- A collision is an event where two objects bump into each other and can transfer energy.
- Ramp
- A ramp is a slanted surface that helps an object move between different heights.
Common Mistakes to Avoid
- Placing dominoes too far apart is wrong because a falling domino may not reach the next one with enough force to knock it over.
- Making turns too sharp is wrong because the domino may fall past the next domino instead of striking it squarely.
- Testing only at the very end is wrong because one small problem can stop the whole project, so each section should be tested as it is built.
- Building on a bumpy or slippery surface is wrong because uneven friction and wobbling can make the dominoes fall early or miss each other.
Practice Questions
- 1 A domino path is 4 meters long and takes 8 seconds to finish. What is the average speed of the chain reaction?
- 2 A student uses 60 dominoes and spaces them 4 cm apart from one domino to the next. About how long is the path between the first and last domino, not counting the domino widths?
- 3 A marble rolls down a ramp and hits the first domino, but the chain stops after a tight corner. Explain two design changes that could help the energy transfer continue around the turn.