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A Physics Talk summarizes the physics principle and includes equations where appropriate.

An Inquiry Investigation is presented for specific students or classes who wish to go further independently. In this case, they can investigate the effect of friction of different surfaces.
A Reflecting On The Activity And The Challenge relates the activity to the larger challenge of developing the moon sport.
" Friction is involved somehow in most if not all sports... One thing is certain, your proposal to NASA won't 'slide through' if you don't demonstrate that you understand frictional forces on the moon. Students have been given another piece of the jigsaw puzzle. How is the sport that they are developing going to be modified because of the decreased friction on the moon? "