Chapter 5, Problem 80A

(a)

To determine

Thecomponents of the force whichincreases when the increase in the angle that table makes with the horizontal surface.

Explanation of Solution

Introduction:

Normal force on any object is a contact force. If two surfaces are not in contact, they cannotapply normal force on each other.

The y axis is taken perpendicular to the table.The x axis is along the surface of a table.

Here weight of the book has two components one component is along the y-axis that is perpendicular and another component is along the x-axis that is parallel to the incline surface.

The component the book's weight force along the table increases as there is increase in the angle that table makes with the horizontal.

Conclusion:

The component the book's weight force along the table increases as there is increase in the angle that table makes with the horizontal.

(b)

To determine

The component of the force which decreases when the increase in the angle that table makes with the horizontal surface.

Explanation of Solution

Introduction

Normal force is a contact force. When two surfaces are in contact, they exert a force on each other.

The y axis is taken perpendicular to the table.The x axis is along the surface of a table.

Here weight of the book has two components one component is along the y-axis that is perpendicular and another component is along the x-axis that is parallel to the incline surface.

The component the book's weight force perpendicular to the table decreases and the friction force decreases as theangle table makes with the horizontal increases.

Conclusion:

The component the book's weight force perpendicular to the table decreases and the friction force decreases as the angle table makes with the horizontal increases.