Where is it and

What is it?Presented by Mark Wilson – RET 2009

? Purpose: to develop an understanding as to how interactions determine the existence of matter

Objective: BY INDIRECT MEANS, determine the size and shape of an unseen object using a rolling marble

Procedure The white paper on top of each “cover” is a

tracing platform As you roll your marble under the cover, mark

the entrance and exit points of the marble Trace the approximate path of the marble on

the paper with a pen/marker Enough paths will help to “outline” the shape

of the object (NEVER TAKE PAPER OFF COVER)

Be sure to roll the marble from different angles/sides XXXX

After your rolling, prepare your whiteboard

Whiteboard Draw the shape of the object based on

your results Answer the following questions:

How was the speed of the marble a factor?

Discuss if marble size compared to the target size could size be a factor.

Why is it important to trace ALL paths?

Limitations/sources of error…