It's good to try hard at your school work.
Sam is assigned a book report that is due next Friday.
Sam wants to finish the book report.
Sam reads the book thoroughly and gives his best effort on writing the report.
Sam gives little effort on the book report and finishes it as quickly as possible without actually reading the whole book.
Sam receives an A on the report and easily passes the class.
Sam receives a D on his book report and fails the class.