Lab Exam On answer sheet, make sure to fill out your NAME, SECTION and STUDENT NUMBER (written and in bubbles) Name Section Student number (written) Student number (in bubbles)

Experiment 4 part 2 – Feedback and recap of Experiment 4 part 1 – Lab 4: Coefficients of Friction using angles Goals for this lab: o How can you measure the static,  S, OR kinetic,  K, coefficients of friction using two different methods? o How can you determine which method is better?

– Design an experiment to measure  S OR  K using an inclined plane How many measurements are you going to take? Experiment 4 part 1 – Measure the same coefficient using the equipment from last time Make sure you are using a horizontal plane this time How many measurement are you going to take? – For each method calculate a value for the coefficient and its uncertainty – Which method is better? – Group discussions

Things to think about – How are you going to measure the uncertainties? – What makes one method better than the other? – Would one method be better in certain situations? Why? – How can you reduce the uncertainty of your measurements? – What can improve your measurements?