The glider floats on a cushion of air to reduce friction. suppose that this measure is ineffective, and there is a non-negligible, but unknown friction force caused by physical contact between the glider and the track, and that the frictional force now does depend on the normal force. show analytically how it would affect your resultant calculation of g. for example, will this added friction cause your calculated value of g to increase or decrease?

You need to be more specific.  i really don't know what a "motion map" is.you can draw a graph of an object's position, distance, displacement, speed,velocity, or acceleration versus time, or you can draw a graph of the object's x-position versus its y-position and not give any information about time at all.if the graph presents position or displacement against time,  then constant velocity is a straight line . . i.e. a line that has  constant slope.if the graph shows speed against time, then constant velocityis a horizontal piece of line.if the graph shows acceleration against time, then constant  velocity is a piece of line that lies on the x-axis . . it's value is zero. 

Inelastic is the answer your looking for.

Where is the diagram?