| A 2 kg book sits at rest on a horizontal table. The coefficient of static friction between the book and the surface is 0.40. and the coefficient of kinetic friction is 0.20. (a) What is the normal force acting on the book? (b) Is there a friction force on the book? (c) What minimum horizontal force would be required to cause the book to slide on the table? (d) If you give the book a strong horizontal push so that it begins sliding, what kind of force will cause it to come to rest? (e) What is the magnitude of this force?
| A 2 kg book sits at rest on a horizontal table. The coefficient of static friction between the book and the surface is 0.40. and the coefficient of kinetic friction is 0.20. (a) What is the normal force acting on the book? (b) Is there a friction force on the book? (c) What minimum horizontal force would be required to cause the book to slide on the table? (d) If you give the book a strong horizontal push so that it begins sliding, what kind of force will cause it to come to rest? (e) What is the magnitude of this force?
| A 2 kg book sits at rest on a horizontal table. The coefficient of static friction between the book and the surface is 0.40. and the coefficient of kinetic friction is 0.20. (a) What is the normal force acting on the book? (b) Is there a friction force on the book? (c) What minimum horizontal force would be required to cause the book to slide on the table? (d) If you give the book a strong horizontal push so that it begins sliding, what kind of force will cause it to come to rest? (e) What is the magnitude of this force?
The uniform dresser has a weight of 90 lb and rests on a tile
floor for which µs = 0.25. If the man pushes on it in the
horizontal direction e = 0°, determine the smallest
magnitude of force F needed to move the dresser. Also, if
the man has a weight of 150 lb, determine the smallest
F
coefficient of static friction between his shoes and the floor
so that he does not slip.
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Find the smallest possible force that the woman should pull to cause the crate to slide. Coefficientof static friction is 0.20.
a) A delivery truck with two stacked crates in the back brakes quickly. The crate on the bottom just barely stays put on the floor of the truck. Does the top crate stay put or does it fall off? The top crate has a mass of 27.0 kg and the mass of the bottom crate is 22.0 kg. The coefficient of static friction between the bottom crate and the truck is 0.420, and the coefficient of kinetic friction for that surface is 0.350. The coefficient of static friction between the crates is 0.400, and the coefficient of kinetic friction is 0.320.
Hint: Don’t forget about Newton’s 3rd Law especially when dealing with friction between the two crates
b) The top crate will slide off if it moves more than 87.5 cm. If the truck braked for 1.84 s did the top crate slide off? If not, how far did it move?
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