Ch4_2 #3

See Ch 4 Sheet 19: turn the inclined plane such that it is horizontal (the 30 degrees go to 0 degrees.) and introduce friction (see Sheet 24) between the bottom of block A and the supporting surface. See Sheet 21 equation (2). How do you have to modify that equation to be valid for your block B (Hint: B moves with constant velocity. Is there an acceleration ?) ? What does your modified equation (2) say about the tension T in the string, which is also the tension pulling on block A ? The tension T acting on block A and the frictional force acting on it together make up the net force acting on block A which moves with constant velocity too. What is then the net force on A ? Write down your condition for this net force. You need to express the frictional force as is done on Sheet 24 using for the Normal Force Sheet 11. You obtain an equation where all variables are known except the coefficient of friction asked for. Solve for it.