fk = μkFN Equation 5-3 Notice that Equation 5-3 is different than the one for static friction. Static friction had a range from 0 to some maximum value but kinetic friction just has one value. Exercise 5-3. For these questions, imagine a very heavy object like a refrigerator sitting on a rough floor. We have now given it enough force to make it move so all the questions below are about kinetic friction. Assume that the applied force is horizontal and to the right (so in the + X direction). 1. If you increase the amount of applied force, what will happen to the acceleration of the object? 2. If you increase the amount of applied force, what will happen to the coefficient of kinetic friction, μk, of the object? 3. If someone eats all the food in the refrigerator but you keep pushing with the same applied force, what will happen to the acceleration of the object 4. If someone eats all the food in the refrigerator but you keep pushing with the same applied force, what will happen to the friction force of the object? 5. If someone eats all the food in the refrigerator but you keep pushing with the same applied force, what will happen to the coefficient of kinetic friction, μk, of the object? 6. If you stopped pushing (so the Applied Force is now 0), what will happen? Briefly explain your reasoning using velocity, acceleration, and friction forces. fk = μkFN Equation 5-3 Notice that Equation 5-3 is different than the one for static friction. Static friction had a range from 0 to some maximum value but kinetic friction just has one value. Exercise 5-3. For these questions, imagine a very heavy object like a refrigerator sitting on a rough floor. We have now given it enough force to make it move so all the questions below are about kinetic friction. Assume that the applied force is horizontal and to the right (so in the + X direction). 1. If you increase the amount of applied force, what will happen to the acceleration of the object? 2. If you increase the amount of applied force, what will happen to the coefficient of kinetic friction, μk, of the object? 3. If someone eats all the food in the refrigerator but you keep pushing with the same applied force, what will happen to the acceleration of the object 4. If someone eats all the food in the refrigerator but you keep pushing with the same applied force, what will happen to the friction force of the object? 5. If someone eats all the food in the refrigerator but you keep pushing with the same applied force, what will happen to the coefficient of kinetic friction, μk, of the object? 6. If you stopped pushing (so the Applied Force is now 0), what will happen? Briefly explain your reasoning using velocity, acceleration, and friction forces.