Physics and Astronomy

At Arms Length
Objective To build a mechanical arm.
Purpose To demonstrate simple mechanical power,
Participants: Any number of individuals or teams.
Materials 20 plastic drinking straws - 20 dressmaker's straight pins
  • Total construction time is 45 minutes.
  • The arm must be hand held.
  • The contestants may have trial runs within the 45 minute period.
  • Procedure The contestants will use his/her arm to lift a 100 gram mass as illustrated
    Judging The horizontal distance from the mass to the hand of the contestant who successfully lifts the mass is the deciding factor - the greater the distance, the greater the number of points. This is shown below.
    Source Youth Science Foundation Science Olympics Manual.

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