Question

2 which of the following cases does the free - body diagram below represent? f_norm f_grav a a book falling off a table b a book sliding across a table at a constant speed c a book resting on a table d a book being lifted off the table

Explanation:

The free - body diagram shows a normal force ($F_{norm}$) acting upwards and a gravitational force ($F_{grav}$) acting downwards. When a book is resting on a table, the normal force from the table balances the gravitational force on the book. In the case of a falling book, there is no normal force. When a book is sliding, there is also a frictional force involved which is not shown. When a book is being lifted, there is an additional upward applied force.

Answer:

C. a book resting on a table