A student of physics is carrying a heavy wooden crate. Being educated about friction, this student temporarily reduces the burden by pressing the crate against a wooden wall with a force, Fapp, applied at an angle θ above the horizontal, as shown in the figure. Assume that the crate slides with a small but constant speed up the wall to a point where the student can grip it more comfortably. The coefficients of static and kinetic friction are μs and μk, respectively. Coordinate axes have been indicated. Please use the interface below to create your free body diagram for the crate. If appropriate, use Fg to represent a weight, use Fn to indicate a normal force, use Fs to indicate static friction, and use Fk to represent kinetic friction. Enter an expression for the x component of the net force on the crate in terms of the various forces acting upon it. Part (c) Enter an expression for the y component of the net force on the crate in terms of the various forces acting upon it. Part (d) Enter an expression for the magnitude of the applied force which keeps the crate moving with constant speed. Use only the symbols provided in the palette. Part (e) Suppose that μs=0.67and μk=0.25 If the mass of the box is 39.7 kg, then, if it is applied at an angle of 76.7∘76.7∘, what is the magnitude, in newtons, of the applied force that keeps the crate moving upward at a constant velocity?
A student of physics is carrying a heavy wooden crate. Being educated about friction, this student temporarily reduces the burden by pressing the crate against a wooden wall with a force, Fapp, applied at an angle θ above the horizontal, as shown in the figure. Assume that the crate slides with a small but constant speed up the wall to a point where the student can grip it more comfortably. The coefficients of static and kinetic friction are μs and μk, respectively. Coordinate axes have been indicated. Please use the interface below to create your free body diagram for the crate. If appropriate, use Fg
to represent a weight, use Fn to indicate a normal force, use Fs to indicate static friction, and use Fk to represent kinetic friction. Enter an expression for the x component of the net force on the crate in terms of the various forces acting upon it.
Part (c) Enter an expression for the y component of the net force on the crate in terms of the various forces acting upon it.
Part (d) Enter an expression for the magnitude of the applied force which keeps the crate moving with constant speed. Use only the symbols provided in the palette.
Part (e) Suppose that μs=0.67and μk=0.25 If the mass of the box is 39.7 kg, then, if it is applied at an angle of 76.7∘76.7∘, what is the magnitude, in newtons, of the applied force that keeps the crate moving upward at a constant velocity?
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