A woman holds a book by placing it between her hands such that she presses at right angles to the front and back covers. The book has a mass of m = 1.1 kg and the coefficient of static friction between her hand and the book is μs = 0.55. m = 1.1 kg μs = 0.55 1) What is the weight of the book, Fgb in Newtons?  2) What is the minimum force she must apply with each of her hands, Fmin in Newtons, to keep the book from falling?

A supermarket pushcart is being pushed at 45 degrees with respect to the horizontal from the starting point to the cashier, which is 25 feet away. The cart is 5kg, it contains 2 boxes of 10-1b flour and seven packs of half-kilogram sugar. The coefficient of friction between the wheels and the floor is 0.03. a. What force is required? b. How much force is required?

A 500 N block is being pushed along a frictionless horizontal surface by a force of 150 N at 40° to the horizontal. What is the normal force from the surface on the object? A) 96 N B) 150 N C) 404 N D) 500 N E) 596 N 150 N 500 N 40.0°

An early submersible craft for deep-sea exploration was raised and lowered by a cable from a ship. When the craft was stationary, the tension in the cable was 6500 N. When the craft was lowered or raised at a steady rate, the motion through the water added an 1800 N drag force.  What is the weight of the rider?

5) A box with mass m=1.25 kg rests on the top of a bar. The coefficient of static friction between the box and the bar is μs=0.73 and the coefficient of kinetic friction is μk=0.39. a) Write an expression for Fm the minimum force required to produce movement of the box on the top of the bar.  b) Solve numerically for the magnitude of the force Fm in Newtons. c) Write an expression for a, the box's acceleration, after it begins moving. (Assume the minimum force, Fm, continues to be applied.)  d) Solve numerically for the acceleration, a in m/s².

A100-kg sofa needs to be moved across a level floor. The coefficient of static friction between the sofa and the floor is 0.40. Two physics students decide to apply a force F!" on the sofa. One student recommends that the force be applied upward at an angle theta above the horizontal. The other student recommends that the force be applied downward at an angle theta below the horizontal. Explain which student has the better idea and why.

2. A block of mass 3.00 kg is pushed up against a wall by a force P that makes a 50.0° angle with the horizontal as shown in the figure. The coefficient of static friction between the block and the wall is 0.250. Determine the possible values for the magnitude of P that allow the block to remain stationary 50.0° P

a 50kg block of wood is inially at rest on a horizontal surface. The coefficients of static and kinetic friction between surfaces are 0.35 and 0.30 respectively. A.what value of horizontal force is required to start the motion of the block? B.what value of horizontal force is required to keep the block in constant velocity after moving? C.what magnitude of force will be needed to keep the motion constant if the force is applied 30° upward to the right above the horizontal?

A 150-lb block rests on a horizontal surface. The coefficient of static and kinetic frictions between the block and the surface are 0.30 and 0.20, respectively. What is the acceleration of the block when P = 90 lb. P μs=0.30, μk=0.20 150 lb

30. An object is acted upon by an applied force F and a normal force N due to a surface with coefficients of static and kinetic friction µ, and µk, respectively. Which of the following statements is ALWAYS TRUE? A. The frictional force is opposite in direction to F. B. The static frictional force is equal to µ,N. C. The kinetic frictional force is proportional to N. D. The kinetic frictional force is greater than the static frictional force.