You press a book flat against a vertical wall with your hand. What is the direction of the friction force exerted by the wall on the book?
(a) downward
(b) upward
(c) out from the wall
(d) into the wall.
What type of friction is present?
(a) static
(b) kinetic
(a) downward
(b) upward
(c) out from the wall
(d) into the wall.
What type of friction is present?
(a) static
(b) kinetic
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FRICTION
1.) You press a book flat against a vertical wall with your hand. What is the direction of the friction force exerted by the wall on the book?
ANSWER
B. Upward
» When you try to press a book to a vertical wall, the tendency of friction is upward, because the friction will try to oppose the downward pull of gravity coming from the Earth.
2.) What type of friction is present?
A. Static
» Static friction exists in this situation because the book is at rest, and the enegy applied by the person in pushing the book is also being pushed back by the vertical wall, this is the law of interaction by Sir Isaac Newton. As long as there is no motion, it is static friction not kinetic.
ADDITIONAL INFORMATION
The frictional force resists force that is being applied to the book by the person, and the book remains at rest until the force of static friction acting between the wall and the book is overcome.
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