1. 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)

2. 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?

3. – 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

4. 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?