| 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?
A block weighing 80N rests on a plane inclined at 20o to the horizontal. The coefficient of static friction is 0.25, while the coefficient of kinetic friction is 0.15. a) What is the minimum force |F|, parallel to the plane, that will prevent the block slipping down the plane? b) What is the minimum force |F| that will start the block moving up the plane? c) What force |F| is required to move the block up the plane at constant speed?
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?
b) A 25.0kg crate is at rest on a floor as shown. The coefficient of static friction between the crate and floor is
0.375 and the coefficient of kinetic friction is 0.320. Calculate the minimum horizontal force (F) required to
make the crate start sliding.
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