Spinning tops are more than just toys—they are miniature physics laboratories. By building and testing your own tops, you can explore concepts like angular momentum, center of mass, friction, and balance. This guide walks you through creating a simple top from household materials and then running experiments to see how different variables affect spin time and stability. No prior science background is needed, just curiosity and a steady hand.
What You’ll Need
- A round wooden or plastic disc (like a large button or a bottle cap) – this will be the top’s body
- A short, pointed stick or a wooden skewer (about 4–6 inches long) – this will be the spindle
- Strong glue or a hot glue gun (with adult supervision if using hot glue)
- A flat, smooth surface (like a tabletop or a piece of cardboard)
- A stopwatch or a phone timer
- A ruler or measuring tape
- Optional: markers, stickers, or paint to decorate the top
- Optional: different materials to test (e.g., sandpaper, wax paper, aluminum foil) for friction experiments
Step-by-Step
- Prepare the disc. If you’re using a bottle cap, clean it and remove any liner. For a button, make sure the holes are not too large. The disc should be flat and have a small hole in the center (or you can carefully make one with a nail and hammer, with adult help).
- Insert the spindle. Push the pointed stick through the center hole. The point should extend about 1–2 inches below the disc, and the rest should stick up above. The stick should fit snugly; if it’s loose, wrap a bit of tape around the stick where it passes through the disc.
- Secure the spindle. Apply glue around the hole on both sides of the disc to hold the stick firmly in place. Let the glue dry completely. If using hot glue, be careful not to burn yourself.
- Test your top. Place the top on a flat surface, holding the top of the stick between your thumb and index finger. Give it a quick, sharp twist with your fingers and let go. Watch how it spins. If it wobbles a lot, check that the spindle is perpendicular to the disc (not tilted).
- Measure spin time. Start the timer as soon as you release the top. Stop the timer when the top falls over or stops moving. Record the time in a notebook. Repeat this several times and calculate an average.
- Experiment with variables. Now change one thing at a time. For example:
- Height of the spindle: Push the stick further up or down (within reason) and test again.
- Weight of the disc: Add small coins or washers to the top of the disc with tape, and see how spin time changes.
- Surface: Spin the top on different surfaces (carpet, tile, wood, sandpaper).
- Record your results. For each change, write down what you changed, how you changed it, and the resulting spin time. This is your data.
- Draw conclusions. Look at your data. Which top spun the longest? Which spun the shortest? Why do you think that happened? Think about friction and balance.
Common Mistakes
- Spindle not centered. If the stick is off-center, the top will wobble and fall quickly. Always check that the hole is exactly in the middle of the disc.
- Spindle tilted. The stick must be perpendicular to the disc. If it’s angled, the top will spin unevenly.
- Too much glue. Excess glue can make the top unbalanced. Use just enough to hold the stick.
- Spinning too hard or too soft. If you spin too hard, the top may jump; too soft, and it won’t get enough momentum. Practice a consistent, firm twist.
- Ignoring the surface. A bumpy or uneven surface will ruin the spin. Always use a flat, level area.
Tips
- Use a disc with a larger diameter (like a plastic lid from a yogurt container) for a more stable top.
- Make several tops with different disc sizes and compare them.
- Decorate the top with markers or stickers; this makes it easier to see the rotation and also adds fun.
- When timing, have one person spin and another person time to avoid delay.
- Try spinning the top in the opposite direction (clockwise vs. counterclockwise) to see if it makes a difference.
Troubleshooting
- Top falls over immediately. Check the centering and perpendicularity of the spindle. Also, make sure the disc is not warped. Try a different disc.
- Top wobbles a lot. This usually means the spindle is not perfectly straight or the disc is not balanced. Try repositioning the stick or adding a small piece of tape to the lighter side of the disc.
- Top doesn’t spin at all. Ensure the point of the spindle is sharp enough to make contact with the surface. If it’s blunt, sand it down gently with sandpaper.
- Spin time varies wildly between trials. This is normal; your hand may be delivering different amounts of force each time. Try to use the same motion each time, and take multiple trials.
- Glue doesn’t hold. If the spindle comes loose, use a stronger adhesive or wrap a rubber band around the stick above and below the disc to hold it in place while glue dries.
Frequently Asked Questions
Why does a spinning top stay upright?
Because of angular momentum—a spinning object resists changes to its axis of rotation. The faster it spins, the more stable it is.
What makes a top spin longer?
Less friction at the point of contact, a lower center of mass, and a higher moment of inertia (weight distributed farther from the axis) generally help.
Can I use a pencil as the spindle?
Yes, but a pencil is thick and heavy. A thin wooden skewer works better because it reduces friction.
Why does my top always fall to one side?
That side is likely heavier. Try adding a small piece of tape to the opposite side to balance it.
Does the color of the top affect spin time?
No, color has no effect on physics. It only affects how you see the spin.
How can I make a top that spins for a really long time?
Use a smooth, hard surface, a sharp point, and a disc with weight near the rim (like a plastic lid with coins taped around the edge). Also, practice your spinning technique.