Okay I had a test question today, was unsure what the question meant. Basically here it is:
A person applies 35N at a 25degree angle on a book, sliding it for 40m. What is the total work done on the book?
One possible answer was simply 1400joules, or 35*40.
But because it is being applied at a 25 degree angle to the horizontal, that to me means not all of the force the person exerts is going toward moving the book, some is just pushing downward on the earth. Some of it is In fact, 31.172N is being applied and actually moving the book forward. This means the total work done is 1268.83Joules
Was I correct?