Friction+hint

Using a ramp, or an inclined plane, to load a truck presents a whole different set of problems than using it to unload the truck. Think about when you want the ramp to keep you from slipping and when you want the package to slide easily.

Extra credit: I am sorry, but there is no extra credit available with the hint this week. Extra credit will now be earned by emailing your answer to Mr. Rossi.