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Mechanics:
PIRA Class: 1Q20.50
Purpose:
Demonstrate faster than g acceleration
Description:
A small marble is held in place at the end of an inclined meter stick hinged at the opposite end. The meter stick and marble are released simultaneously and the marble lands in a small cup attached to the meter stick showing that the end of the stick accelerated downward faster than g (as the board reaches the table before the marble in free fall).
Place the marble in the washer at the edge of the meter stick. While holding the marble in place with your finger, raise the meter stick so that the top side of the stick is just even with the top of the vertical guide rails (the stick is now at an approximately 35 degree angle). Release the stick and marble simultaneously.
NOTE: The marble will hit the edge of the cup or land inside the cup and bounce out if not done exactly correctly. Here is a slow motion video showing the marble land in the cup.
WHY: Writing Newton's 2nd law of rotation using the torque exerted at 50 cm due to stick's weight and the moment of inertia of the the stick: 1/3ML^2 you can calculate the linear acceleration of the end of the stick to be 1.2g initially rising to 1.5g at the end of the fall.
Equipment:
Falling chimney apparatus with marble
Location:
Shelf 145
Extras:
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