Question

a 20.0 kg box is pushed across a rough level floor by means of a

A 20.0 kg box is pushed across a rough level floor by mEANS of a 5ooN FORCE IP) applied at an angle of 370 below the horizONTAL AS SHOWN. tv P=500N g=9,80 M/A² (a) Draus a free-body ---... 2oka I THTRTTITOT - diagram of the box using the point-mass model. (6) Find the magnitude of the normal contact force (n) that acts on the box. (c) If the box slides to the right at a constant speed of 2.50M/ , what magnitude frictional force (fa) acts on it ? (d) Calculate the kinetic frictional coeficient elk. (e) If the push (P) on the box by the person is taken as the "action", describe the reaction. Specifically, give it's magnitude, direction, the body exerting it, and the body experiencing

Answer 1

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a) FBD of box, 2011-zop Cp37 MN = f p=500N esinzi b) N=20g eplin 37 = 20x9.87SOogsinsi=496.9075N) And (Normal force ) c) for constant speed, along horizontal net force =0 pop) = f fiction (fr) = 500 Cop37 = 399.3177 N 1 And d) Mx = to = 399.3177 = 0.8036) And 496.9075 e) Action and reaction are equal in magnitude but opposite in direction, 37 mm KR=P=SOON