Research Question & Hypothesis
❓ Research Question
💭 How does the number of candles affect the rotational speed of a candle carousel?
This question is researchable through experimentation because we can systematically vary the number of candles (the independent variable) and measure the resulting rotational speed (the dependent variable) while controlling all other factors.
💡 Hypothesis
If more candles are placed under the candle carousel, then the carousel will spin faster, because more candles produce more heat energy, which creates stronger convection currents that exert greater force on the carousel blades.
📝 Explanation of Predicted Relationship
This hypothesis predicts a positive relationship between the number of candles and rotational speed. The reasoning is based on the scientific principle that:
- 🕯️ Each candle produces thermal energy (heat) when burning
- 🔥 More candles produce more total heat energy
- 💨 More heat energy creates stronger convection currents
- ⬆️ Stronger convection currents mean faster-rising hot air
- 💪 Faster-rising air exerts greater force on the angled blades
- ⚡ Greater force results in faster rotational speed
This hypothesis can be tested by measuring the rotational speed (in rotations per minute, or RPM) of the carousel with 1, 2, 3, and 4 candles, while keeping all other variables constant.