Find the kinetic friction of an object at an angle

AI Thread Summary
To find the kinetic friction of the box, first calculate the normal force by considering the weight of the box and the vertical component of the pulling force. The weight of the box is 87 lb, and the pulling force has a vertical component of 60 lb * sin(15 degrees). The normal force is then the weight minus this vertical component. The kinetic friction can be calculated using the formula F_friction = coefficient of kinetic friction * normal force, where the coefficient is 0.35. This approach effectively determines the kinetic friction acting on the object.
Samantha Durrey
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A box weighing 87 lb is being pulled with a rope that exerts a force of 60. lb at an angle of 15 degrees with the horizontal. If the coefficient of kinetic friction is .35, what is the kinetic friction?
 
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Hello,

you see in this case weight mg have two componets along the plane and prependicular to plane. component along the plane tries to bring weight down the slide and the other component pushes the plane. As this component push plane, plane would also push it with same force unless plain would have deprssed. This resultant gives rise to friction.
F = mgCos(alpha)
Rest you can calculate. Hope this one helps.
 

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