Roller experiment can make students intuitively observe the phenomenon of alternating conversion between kinetic energy and elastic potential energy during the movement of an object, and also help students explore the influence of kinetic energy on the movement distance of an object.

Production method:

The appearance of the teaching aid is a closed cylinder, which can be made directly from an empty "eight-treasure porridge" jar. For aesthetic reasons, the sides of the jar are surrounded by cardboard or other colored paper.

When making, firstly, two holes are punched in the relative position between the bottom of the jar and the lid, each hole is about 05 cm in diameter, and a 1 rubber band and two rubber bands are inserted between the holes at the upper and lower ends.

Fix the 1 nut between two rubber bands, and the size should be about 05 cm away from the inner wall of the tin can around the fixed nut.

Two rubber bands are exposed at both ends outside the jar and connected with 1 paper clips to prevent retraction. In this way, the "magic drum" for studying the conversion of kinetic energy and potential energy is completed.