The block shown is pulled across the horizontal surface at a constant speed by the force shown. If M = 6.0 kg, F = 15 N and θ = 37°, what is the coefficient of kinetic friction between the block and the horizontal surface?

A block weighing 38 kg is on an incline with a slope of 17o. If the block is at the verge of sliding down the incline, what is the static frictional force of resistance? A block weighing 25 kg is on an incline with a slope of 28o. If the block is at the verge of sliding down the incline, what is the static friction coefficient?

A block with mass m is at rest on a rough inclined plane and is connected to an object with the same mass as shown. The rope and the pulley may be considered ideal. The coefficient of static friction between the block and the plane is ps; and the coefficient of kinetic friction is uk. If the rope were cut between the block and the pulley, which of the following equations can be used to calculate the magnitude of the acceleration of the block down the plane? (Hint: draw free body diagram). g-Hk cos(e)) Og- P sin(0) Og Og(tan(0) Hk sin(@)) Og(sin(0)- u cos(0))

A crate with a mass of m=254kg rests on the horizontal deck of a ship. The coefficient of static friction between the crate and the deck is μs=0.83. The coefficient of kinetic friction is μk=0.47.  Write an expression for the magnitude of the force, Fv, that must be applied to keep the block moving at a constant velocity.

A 5.95 kg block is sitting on a level floor.  A person is pulling on a rope attached to the block at a 34.84 degree angle above the horizontal (see figure). The force exerted by the person is 7.33 N.  What is the normal force acting on the block from its contact with the floor?

A block of mass m = 1.85 kg is pushed a distance d = 3.15 m along a frictionless horizontal table by a constant applied force of magnitude F = 16.0 N directed at an angle ? = 32.0° below the horizontal as shown in the figure below. A block labeled m is on a horizontal surface. An arrow labeled vector F points downward and to the right at an angle ? above the horizontal, and acts upon the upper left corner of the block. A faded image of the block is a distance d to the right of the block. (a) Determine the work done on the block by the applied force.(b) Determine the work done on the block by the normal force exerted by the table.(c) Determine the work done on the block by the force of gravity.(d) Determine the work done by the net force on the block.

The coefficient of kinetic friction between a box and the floor is μk = 0.14 and the coefficient of static friction is μs = 2.0μk. Calculate the ratio of static to kinetic friction force if m = 8 kg.

A block of mass  m = 2.50 kg  is pushed  d = 2.90 m  along a frictionless horizontal table by a constant applied force of magnitude  F = 15.0 N  directed at an angle  θ = 25.0°  below the horizontal as shown in the figure below. A block labeled m is on a horizontal surface. An arrow labeled vector F points downward and to the right at an angle θ above the horizontal, and acts upon the upper left corner of the block. A faded image of the block is a distance d to the right of the block.   (a) Determine the work done by the applied force. J(b) Determine the work done by the normal force exerted by the table. J(c) Determine the work done by the force of gravity. J(d) Determine the work done by the net force on the block. J

A 1500-N crate is to be held in place on a ramp that rises at 30.0° above the horizontal (see figure). The massless rope attached to the crate makes a 22.0° angle above the surface of the ramp. The coefficients of friction between the crate and the surface of the ramp are uk = 0.450 and us = 0.650. The pulley has no appreciable mass or friction. What is the MAXIMUM weight w that can be used to hold this crate stationary on the ramp? %3D W= ? Crate 22.0° Ramp 30.00

You are a bully.  You pin a 48 kg dweeb to a wall so that his feet aren't touching the ground.  Your arm is extended so that it makes an angle 28 degrees with the horizontal.  The dweeb's back is so sweaty with fear that there is no friction between his back and the wall.  What is the magnitude of the force , in N, you must apply to keep the dweeb in equilibrium? (Use g = 10 m/s2) This scenario is represented schematically below.  Unfortunately for you, years later the dweeb is your boss and he makes your life miserable. (Please answer to the fourth decimal place - i.e 12.3445)