When you push a 1.92-kg book resting on a tabletop, you have to exert a force of 2.05 N to start the book sliding. Once it is sliding, however, you can use a force of only 1.03 N to keep the book moving with constant speed. What are the coefficients of static and kinetic friction between the book and the tabletop?

A 97-kg sprinter wishes to accelerate from rest to a speed of 13 m/s in a distance of 22 m. What coefficient of static friction is required between the sprinter's shoes and the track?

A 42.0-kg parachutist is moving straight downward with a speed of 3.85 m/s. (a) If the parachutist comes to rest with constant acceleration over a distance of 0.750 m, what force does the ground exert on her? (b) If the parachutist comes to rest over a shorter distance, is the force exerted by the ground greater than, less than, or the same as in part (a)? Explain.

Using all of the students in your class, find the actual time it takes to pass the book. Actual time to pass the book: _____

If you drop a sheet of paper and a book side by side, not surprisingly the book falls faster than the paper. If you place the paper against the lower surface of the raised book and again drop them at the same time, they hit the floor at the same time. The book simply pushes the paper with it as it falls. Repeat, but with the paper on top of the book, and not sticking over its edge. How will the accelerations of the book and paper compare? Will these objects separate and fall differently? Or will they have the same acceleration? Try it and see! Then explain what happens.

It is hard to imagine that there can be enough air between a book and a table so that there is a net upward (buoyant) force on the book despite the large downward force on the top of the book. About how many air molecules are there between a textbook and a table, if there is an average distance of about 0.01 mm between the uneven surfaces of the book and table?

A string is tied to a book and pulled lightly as shown at right. The book remains in contact with the table and does not move.

a. Draw a free-body diagram for the book. Label each of the forces exerted on the book as you were instructed in the tutorial Forces. String

b. How do the forces exerted on the book in this case compare to the forces exerted on the book when the string is not present? List any forces that are the same (i.e., same type of force, same direction, and same magnitude) in both cases. Make a separate list of forces that change (or are not present) when the string is pulled.

Wilbur is asking Mr. Ed the talking horse to pull a cart. Mr. Ed replies that he would like to, but the laws of nature just won't allow it. According to Newton's third law, he says, if he pulls on the cart, it pulls back on him with an equal force. Clearly, then, the net force is zero, and the cart will stay put. How should Wilbur answer the clever horse?

A container has a square base. The area is 800$cm ^ { 2 } .$ The size of a book is 25 cm by 30 cm. Can the book lie flat on the base of the container?a. Find the side length of the container. b. Compare the side length with the dimensions of the book. c. Use the comparison to determine if the book will fit.

Describe book lungs.

Describe the relative amounts of potential and kinetic energy for a book in the following situations. a. The book on a high shelf which is 2 meters off the ground. b. The book after it has fallen off the 2-meter shelf and is now 1 meter off the ground. c. The book just before it hits the ground.

Mike used 2989 digits to number the pages of a book. How many pages does the book have?

An eraser with a mass of 100 g sits on a book at rest. The eraser is initially 10.0 cm from any edge of the book. The book is suddenly yanked very hard and slides out from under the eraser. In doing so, it partially drags the eraser with it, although not enough to stay on the book. The coefficient of kinetic friction between the book and the eraser is 0.150. (a) The sign of the work done by the force of kinetic friction of the book on the eraser is (1) positive, (2) negative, or (3) zero work is done by kinetic friction. Explain. (b) How much work is done by the book's frictional force on the eraser by the time it falls off the edge of the book?

What inference rule is illustrated by the argument given? If Martina is the author, then the book is fiction. But the book is nonfiction. Therefore Martina is not the author.