Question

cooler 2. Iee Fishing (6 points) Finnish physicist Niko Jokela is going ice fishing. He pushes a large full of beer, with a mass of 14 cooler is 32 N, and the cooler slides across the ice with a constant velocity of 1.8 m/s. Niko pushes d Kg, across a frozen pond in Lapland. The force of kinetic friction on the 20 m. (a) (3 positive or negative.) (b) (3 points) Niko slips, falls do points) How much work does Niko do on the cooler? (Be sure to indicate whether the work is friction in slowing down and stopping the cooler? (Agai positive or negative.) wn, and lets go of the cooler. How much work is done by kinetic n, be sure to indicate whether the work is

Answer 1

Person will have to do work to overcome kinetic friction w_p = (mg)d = 14 times 9.81 times 20 = 2746.8j work done to overcome kinematic friction, w_k = F_k times d = 32 times 20 w_k = 640j Therefore Total work = w_e + w_k = 3386.8j (positive) Distance travel by cooler after force is removed Therefore V^2 - u^2 = 2gh Therefore 1.8^2 - 0 = 2g(h) Therefore h = 0.1651 m Now kinetic friction work, w_k = F times h = 32 times 0.1651 Therefore w_k = 5.2844j Negative work