Question

When you lift a book from the ground to your desk, what kind of work do you do, negative or positive?

Answer 1

In which direction u r applying force on book?

Answer 2

U r applying force on book upward. Right?

Answer 3

And displacement of ur book frm ground to desk. So its also upward

Answer 4

So ur applying force and displacement is along upward

Answer 5

So angle between ur applying force and displacement is 0 degree

Answer 6

U know
w=Fs*cos thata=Fs*cos 0=Fs

Answer 7

Response plz!!!

Answer 8

Ascencion means gain in potential energy and descing is the opposite, hence when you lift a book, you apply a positive work.

Answer 9

You lose energy where as book gains energy. Therefore, positive work on book, negative on you.