10_03_2nd_law_Energy_2

10_03_2nd_law_Energy_2 - Show your reasoning. c) Find the...

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Physics 211 10/1 HW Handout Due Monday 10/7 Fall 2002 2 nd Law vs. Energy 1) Paul pushes a 10kg box across a rough floor. The box’s initial velocity is 0.5m/s to the right. The coefficicient of kinetic friction is μ k = 0.3 Paul applies a steady force of 50N to the right on the box. Let g = 10N/kg for this problem. a) Draw a free body diagram at right consistent with the second law, including arrows showing the directions of the acceleration and the net force. b) Find the acceleration, magnitude and direction, of the box.
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Unformatted text preview: Show your reasoning. c) Find the velocity when the box has moved a distance of 5m. You will need to find the time but neither v i or v f equal 0. So, first find the time the box took to get from v = 0 to v = 0.5m/s, then the distance from when v = 0 to v = 0.5, add this to 5m, then find time. d) Now find the same final velocity using energy buckets and work. Show your reasoning. a = F net = box rough floor Paul...
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