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When you walk, friction is what prevents your feet from slipping on the floor.
Imagine if every surface were as slippery as ice—getting around would be very difficult! Friction is a type of force, or a "push" or a "pull," that can act on objects. In physics the frictional force between two surfaces is determined by something called the coefficient of friction. A higher coefficient of friction means that there will be more friction between two surfaces, or they will be less "slippery. The amount of friction also depends on something called the normal force.
In this context "normal" means "perpendicular to the surface.
For example, imagine two identical cardboard boxes sitting on a wooden floor. One box is empty and very light and one is full of stuff and very heavy.
In both cases the coefficient of friction between cardboard and wood is the same. The heavier box, however, will be much harder to slide across the floor. This is because there is a higher normal force between the box and the floor, so there is more friction.
Now, think about friction between two pieces of paper. If you put two pieces of paper on top of one another, they should be very easy to pull apart, right? What will happen if you overlap a whole bunch of pieces of paper, like the pages from two books?
Will they still be easy to pull apart? Try this surprising activity to find out! Observations and results You should have found that it was pretty easy to pull the books apart when only a several pages were interleaved. As you interleave more and more pages, however, it quickly becomes surprisingly difficult to pull them apart—until pretty soon, you cannot separate them at all!
Although the classical demonstration of this project uses large phone books, it works well even for much tinier volumes, including sticky note pads. Can you figure out why this happens, based on what you read in the background section? You know that the coefficient of friction does not change, because the surfaces remain the same material paper. It turns out that when you try to pull the two books apart, the interleaved pages in the middle get squished together harder—this increases the normal force between them, thereby increasing overall friction.
This means that the harder you pull, the higher the friction, and the harder the pages are to pull apart! Physics Books in Chennai View by: Product Supplier. Location Near Me. Showing results with Videos.
Clear Filter. English Name Of Book: Qualified Top Medical Professionals Class: Senior Secondary Stage Age Group: Engineering Physics Ask Price Dr.
Jayraman brings 34 years of teaching experience to author this book. He got his Ph. Chennai, Tamil Nadu Call Anna Univ - ChennaiAuthor: Technical PublicationsPublished Year: Sawant at the cheapest and the best price of Rs. Engg Physics I is published by Technical Publications.
We have the latest edition of this book. Download a PDF copy. Look Inside! Chapters Make a bird Make a boat Make a rube goldberg machine Make a hot air balloon Make a cool house Make a lazer maze Make an eye bowl Make a heart Make a plumbing system Make a speaker.
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