201 1. Make 4 plots of Frictional Force (y axis) vs (weight of block+ additional weight) (x axis) on one graph. Answer the following questions based on your graph. 2. Which surface pair exhibited the greatest frictional force? Explain why. (How do you know from your graph?) 3. Does placing additional weight on the wood block change the amount of frictional force between the block and the surface it is on? Explain why or why not. (How do you know from your graph?) A. Kinetic friction (Use wood blocks or flat masses for race.) Place the board on the table with equal metal weights on the 4 different surfaces. The results are better if you use the flatter brass 10 g or 20 g masses or 4 like coins. Slowly lift the board from the starting position end. The weights will begin to slide as it is raised. Once they begin sliding you are observing kinetic friction (friction when one surface slides against another surface). 4. Which surface has the greatest amount of kinetic friction? How do you know based on what you observed? Make sure not to confuse static friction with kinetic friction!!!!! Cardboard, the cardboard started to fall Fist. 5. Which surface has the least amount of kinetic friction? How do you know based on what you observed? Make sure not to confuse static friction with kinetic friction!!!!! Cork, court has the last to eva 6. How does the force of static friction compare with the force of kinetic friction? (Compare the surface pair with the greatest static friction with the surface pair that has the greatest kinetic friction etc....) Discuss the results.