question archive A box of weight w=2
A box of weight w=2
Subject:PhysicsPrice:2.85 Bought3
A box of weight w=2.0N accelerates down a rough plane that is inclined at an angle 30 degrees above the horizontal, as shown (Figure 6) . The normal force acting on the box has a magnitude n=1.7N, the coefficient of kinetic friction between the box and the plane is AA1/4k=0.30, and the displacement of the box is 1.8 m down the inclined plane. What is the work Ww done on the box by the weight of the box?
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A) What is the work W_grav done on the box by gravity?
Vertical distance = 1.8 sin 30 = 0.90 m
W = 2.0 N * 0.90 m = 1.80J
B) What is the work W_n done on the box by the normal force?
W = 0 J force is perpendicular to displacement
C) What is the work W_f_k done on the box by the force of kinetic friction?
W = -1.8 m *0.30 * 1.7N = -0.92 J
