Phone book friction formula physics

Here you will be introduced to the laws of friction and how the coefficient of friction and the angle of friction are used to solve problems. Put friction to the test with this fun family physics activity. Try pulling apart two interleaved phone books and youll inevitably be defeated by huge frictional forces. When two phone books are put together page by page, they become inseparable unless a great amount of force is used. There are sliding friction experiments, a phone book friction experiment, a way to make rice stick together, an experiment to create frictional heat, and lots more friction experiments for all ages. In this paper we describe a simple alternative to the telephone book friction experiment, a classic demonstration where a small force generated for example by the bending of the outer pages is.

Friction is the hindering force that comes into play when two items are interacting with each other. People have tried pulling two interleaved phone books apart by playing tug. Test which surfaces create more friction, see how strong friction is, learn how to reduce friction, and even discover the side effects of friction. How many pages have to be interleaved before the books resist being pulled apart. In this phone book case however the area is increased by interleaving many friction surfaces so that the force is applied in series to all the surfaces without the corresponding decrease in pressure. A simple alternative to the phone book friction demonstration. Will tory and kari successfully pull apart two phone books in 30 minutes without breaking their teeth. Its well known that two phone books with their pages interleaved are almost. Check your understanding of friction with an interactive quiz and printable worksheet. Researchers explain why its nearly impossible to separate. The friction force, f, always acts in the opposite direction of the intended or actual motion, but only parallel to the surface.

Many people are familiar with the friction enigma of two interleaved phonebooks, in which all of the pages of two phonebooks are overlapped, one by. Even a small number of interleaved pages can result in a surprisingly large amount of friction, making the sticky notes impossible to pull apart. Learn the physics behind the surprisingly powerful force of friction. This phenomenon is commonly demonstrated with phone books. Friction and equilibrium a powerpoint presentation by paul e. How to calculate the coefficient of friction sciencing. The humble phone book has been the subject of one of the more entertaining physics puzzles in recent years. If the fullyloaded sled has a mass of 700 kg, what is the maximum force of static friction, and is the force applied enough to overcome it. Tippens, professor of physics southern polytechnic state university a powerpoint presentation by. The pages of the sticky note pads are held together by friction. Phone book friction science activity at science buddies phone book friction science activity at scientific american making connections.

The more pages you put together, the bigger the area and the more friction you. These practice questions will help you study at any time on. When the force of friction covers a big area, it becomes very strong. Two equalsize books does not have to be a phone book or two thick magazines, notepads or tablets. Friction formula with practice problems byjus formulas. The skis of the sled have a coefficient of static friction. The numerics are, the magnitude of friction is f f, the coefficient of friction is. To measure the force of friction, set up an experiment in which a block, pulled by a string that runs over a pulley and. Physicists solve the mystery of interleaved phone books. Scientists figure out why interleaved phone books cant be. Just calculate the force per page from the formula f coefficient of friction x normal force and then multiply this times the number of pages. Passion brands in the age of disruption rosenblum, jeff, berg, jordan on. The formula to calculate the coefficient of friction is. Learn vocabulary, terms, and more with flashcards, games, and other study tools.