The mousetrap car project is a classic physics challenge: Build a vehicle that can travel as far as possible by using only the energy from a single mousetrap.
Seems simple enough, but the reason it's so popular is because it's rich in science concepts, applied math, and design possibilities.
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Tips and Troubleshooting
If the car isn't moving at all, then...
The wheels may be pressed too tightly against the straw. Make sure the wheels can spin freely.
Check for excessive friction, such as hot glue inside the straws, the wheels rubbing against something, etc.
The mousetrap car might be too big.
If the car isn't rolling in a straight line, then...
The wheels aren’t aligned. Remove and reattach the wheels to make the axels parallel with each other.
Make sure to wind up and release the car so the drive wheels are in front.
If the car isn't coasting very far, then...
Again, look for excessive friction.
The car is too heavy. Try making it smaller or removing excessive material.