Falling Chimney (Faster Than g) (1Q20.50)
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Two boards are fixed together by a hinge at one end so as to allow them to fold together. One board is flat on the table and the other board is propped up by a stick, with a ball balanced on a golf tee attached to the end of the board. When the stick is pulled away and the board is released to free fall, there is a torque about the hinge and rotates as it falls. The rotation causes the end below the ball to accelerate faster than the ball and the ball falls into the cup.
1) Central Scientific Company Catalog #74874 Hinged Stick and Falling Ball Demonstrator.