This demonstration is my first use of the blowgun (repurposed use of Pasco Scientific's Lenz's Law Demonstrator) in my Physics class. In AP Physics 1, we leveraged the blowgun on a tour of the equations of motion during our study of kinematics. (See Blowout Kinematics.)
So if the calculation of the launch speed inspires déjà vu, there's a good reason for that. We do ponder where that speed would be legal for a motor vehicle.
The high speed blowout and breaking through the catch box is intended to set the stage for a review of Newton's laws of motion:
- How are those laws relevant when the marker is in the tube?
- How are those laws relevant when the marker is flying through the air?
- How are those laws relevant when the marker is stopping at the catch box?
Reciting the text of the laws is not encouraged here. The point is to apply Newton's laws to the specifics of this demonstration. The question of how to get an even greater launch speed is explored.
The blooper footage included in the kinematics version of the demo is also included here, since this is the first blowgun demo that many will see.
Here's the post I wrote for my Blog of Phyz when I initially updated this demo for remote teaching/distance learning (RT;DL).
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