1J20.70 Rolling Uphill (Double Cone on Incline)
Centre-of-mass, gravitational potential energy
A symmetrical double cone piece is positioned on the narrow end of a triangular track with a slight incline at the other end. The shape of the track and the pitch of the cones are such that the centre-of-mass of the double cone is at its lowest point at the highest part of the track. As the cone rolls to lower its centre-of-mass, the piece appears to roll uphill on the track.
-  Triangular track
-  Metal cylinder
-  Double cone
- Place the triangular track on a horizontal surface.
- Be sure to check that there are no other objects present that may affect double cone's direction of motion.
- Catch the metal cylinder that is rolling down the track before it hits the end of the track
- Release metal cylinder at the widest part of the track as a control experiment.
- Release the double cone at the widest part of the track. Nothing should happen.
- Release double cone at the narrow end of the track, see how it counterintuitively rolls uphill.
- PIRA 1J20.70
- Don't attempt this at home!
If you have any questions about the demos or notes you would like to add to this page, contact Ricky Chu at ricky_chu AT sfu DOT ca.