• Online Science Resources

    Online Science Resources
 

Come-Back Can

  • Discrepant Event (Investigatable)
  • Make & Take

Activity Length: 

35 mins.

Resource Topic: 

  • Energy
  • Engineering
  • Forces and Motion

Comments

For the BCScTA pro-D day on

For the BCScTA pro-D day on Feb 20, 2015, we made come-back cans out of 3 inch diameter mailing tubes. The caps that come with the mailing tubes are soft plastic, and it's not hard to poke or drill a hole in them. For the elastic bands, we used "Rainbow Loom" elastics, formed into a chain (the way the kids make bracelets). The C-clips that attach the bracelets make good stoppers on the outside of the lids, and we used washers for the weights, tied onto the elastics with a twist-tie. Frozen concentrated juice sometimes comes in cardboard cylinders with metal ends. You need a hammer and nail to punch the holes, but the size is very similar to the mailing tubes, so the rest of the equipment works.

I made a comeback can out of

I made a comeback can out of a large plastic peanut-butter jar; it was great as a final test of students theories of how the can works since you can see it wind and unwind! I only used one rubber band and tied the weight half way.

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