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3. The brakes on a 20 kg cart are locked so that the rubber wheels cannot turn. A child pushes horizontally to the right on the cart until it just begins to slide. The maximum horizontal force he applies is 150,N. After that the child is able to keep the cart sliding with a horizontal force of 80 N. 3.1 Define a normal force. 3.2 Explain the difference between static and kinetic friction. 3.3 Calculate the coefficients of static and kinetic friction between the rubber wheels and the ground
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Sagot :
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