## A girl pushes a 1.04 kg book across a table with a horizontal applied force 10 points of 15.0 N. If the coefficient of kinetic friction

Question

A girl pushes a 1.04 kg book across a table with a horizontal applied force 10 points
of 15.0 N. If the coefficient of kinetic friction between the book and the
table is 0.35, find its acceleration. *​

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3 years 2021-07-14T02:13:20+00:00 1 Answers 68 views 0

Approximately . (Assuming that , and that the tabletop is level.)

Explanation:

Weight of the book:

.

If the tabletop is level, the normal force on the book will be equal (in magnitude) to weight of the book. Hence, .

As a side note, the and on this book are not equal- these two forces are equal in size but point in the opposite directions.

When the book is moving, the friction on it will be equal to

• , the coefficient of kinetic friction, times
• , the normal force that’s acting on it.

That is:

.

Friction acts in the opposite direction of the object’s motion. The friction here should act in the opposite direction of that applied force. The net force on the book shall be:

.

Apply Newton’s Second Law to find the acceleration of this book:

.