Recent content by shalini_monalisa

I am not saying the work done by friction is zero. it is answered thus in the book.

i read in a book-'work is done when a force moves its point of application.this involves movement of the object on which force acts and movement of the force itself.' when this is true ,then why is the work done by friction on pencil zero when pencil makes a circle on a page ? i assume that tip...