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PSA Microgravity Challenge
Final Design

Caroline Robins Community School, Canada
Mrs. Liebrecht’s Grade 4/5 class
photo of design with student designers
By: Jenna, Rochelle, Chelsea and Nicky

See Preliminary Design
Student Response to Experts Questions

How our PSA works: We cut out and taped two pieces of cardboard and stuck them on to opposite ends of the remote controlled skateboard. Then we stuck two strings into the tennis ball and tied the two ends through the pieces of the cardboard. With the remaining piece of string, we held the end of the string and let it go. This caused the tennis ball to lift up 3 inches. We can easily move the PSA forward and back by the use of the remote controlled skateboard.

photo of final design

photo of student prototype

Questions from Expert Dan Andrews with Student Responses:

This is a very nice diagram, and I think I sort-of understand how it works. If I push on the PSA (ball) the skateboard will begin moving.

Student Response

Actually, it is not a matter of pushing on the PSA. You can easily move the PSA forward and back by the use of the remote control.

Expert Question

What if I push the PSA sideways, though? I don't think the skateboard could move in that direction, so the PSA couldn't move.

Student Response

The skateboard does not move side to side, but the string attached to it allows one to accomplish that task manually.

Expert Question

What if I pulled-up on the PSA (Ball)? Would it keep moving up, or would it fall back down as soon as I let go of it?

Student Response

If you let go of the PSA it would fall down once you let it go. This is one problem we are stilling figuring out.

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