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Q. 41

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Physics for Scientists and Engineers: A Strategic Approach with Modern Physics
Found in: Page 179

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Short Answer

The physics book in FIGURE P is connected by a string to a coffee cup. The book is given a push up the slope and released with a speed of . The coefficients of friction are and

a. How far does the book slide?

b. At the highest point, does the book stick to the slope, or does it slide back down?

(a) The book will slide to a distance of

(b) The book will slide down back.

See the step by step solution

Step by Step Solution

Step 1: Given information (part a)

The mass of the book,

The mass of the cup,

Initial speed,

Coefficient of static friction,

Coefficient of kinetic friction,

Step 2: Explanation (part a)

From the free body diagram of the cup, the net forces acting on the cup are Tension (T), weight, and applied force.

The net forces acting on the book can be shown as

The vertical component can be given as

The horizontal component:

Equation of kinematics,

The book will slide to a distance of

Step 3: Given information (part b)

The mass of the book,

The mass of the cup,

Initial speed,

Coefficient of static friction,

Coefficient of kinetic friction,

Step 4: Explanation (part b)

Whether the book sticks to the slope or slides down back, can be known by comparing the maximum amount of static friction to the tension and gravity acting down.

For maximum static friction

For tension

For gravitational pull

Now,

We can see that the total of the forces that causes the downward pull to the book exceed the maximum static friction, hence the book will slide down.

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