Help the spider return home!
Warning! Only under adult supervision.
- Nitinol coil;
- battery pack with crocodile clips;
- toy spider;
- paper clips.
Suspend a nitinol coil above the ground and fix a toy spider to the free end. Stretch the coil down. Attach the crocodile clips of a battery pack to the ends of the coil. The spider is climbing up!
Nitinol possesses a rare and amazing property – the shape-memory effect. At room temperature, it deforms easily and readily adopts new shapes. But when heated, it returns to its previous state, as if the metal remembers how it was before. Nitinol is a conductor, so it can easily be heated with electric current. In metals, current is the ordered movement of electrons. The running electrons collide with the metal atoms and accelerate their vibrations, which causes the metal to heat up.
All the components needed to complete this experiment can be found in the MEL Science subscription!