Problems (2009)
Problems for IYPT New Zealand 2009
1. Stearin engine
A candle is balanced on a horizontal needle placed through it near its centre of mass. When the candle is lit at both ends, it may start to oscillate. Investigate the phenomenon. Maximize the output mechanical power of the system.
2. Skateboarder
A skateboarder on a horizontal surface can accelerate from rest just by moving the body, without touching external support. Investigate the parameters that affect the motion of a skateboard propelled by this method.
3. Drying
Investigate the drying process of a vertical wet paper sheet. How does the boundary of drying move?
4. Optical tube
Look down a cylindrical metal tube which is shiny on the inside. You will notice dark and light bands. Investigate the phenomenon.
5. Hot ball
Put a hot metal ball on parallel horizontal rails. The ball starts to move. Investigate the phenomenon.
6. Sand ripples
Investigate how the formation of sand ripples under shallow water depends on various parameters.
7. Electromagnetic motor
Attach a strong light magnet to the head of a steel screw. The screw can now hang from the terminal of a battery. Completing the circuit by a sliding contact on the magnet causes the screw to rotate. Investigate the parameters that determine the angular velocity of the screw.
