Question

a book is sitting still on a flat table. the force of gravity pulls the book down with 15 n. what is the upward support force (normal force) from the table on the book? 0 n less than 15 n 15 n more than 15 n

Explanation:

Step1: Analyze the book's state

The book is at rest, so it's in equilibrium.

Step2: Apply equilibrium condition

The net - force on the book is zero. Let the gravitational force $F_g = 15N$ (downward) and the normal force $F_n$ (upward). According to Newton's first law for equilibrium, $\sum F = F_n - F_g=0$.

Step3: Solve for normal force

$F_n=F_g$. Since $F_g = 15N$, then $F_n = 15N$.

Answer:

15 N