Question

How much support force does a table exert on a book that weighs 15N when the book is placed on the table?

Answer 1

How much support force does a table exert on a book that weighs 15N when the book is placed on the table?

Solution

$\mathsf{N}_1$ - reaction force, the table exert on a book with this force;

W - the weight of the book;

Third Newton's law: When one body exerts a force on a second body, the second body simultaneously exerts a force equal in magnitude and opposite in direction to that of the first body:

$$\begin{array}{l} \overline {{\mathrm {N}}} _ {1} = - \overline {{\mathrm {W}}}; | \overline {{\mathrm {N}}} _ {1} | = | \overline {{\mathrm {W}}} | \\ \mathrm {N} _ {1} = \mathrm {W} = 1 5 \mathrm {N} \\ \end{array}$$

Answer: the table exert on a book with the force $\mathrm{N}_1 = 15\mathrm{N}$