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Simple Machine: Lever Hands-On Labs, Inc. Version 44-0275-00-01 Lab Report Assistant This document is not meant to be a substitute for a formal laboratory report. The Lab Report Assistant is simply a summary of the experiment’s questions, diagrams if needed, and data tables that should be addressed in a formal lab report. The intent is to facilitate students’ writing of lab reports by providing this information in an editable file which can be sent to an instructor. Data Table 1. Fulcrum at Trial Load (Mass) cm. Distance of Load from fulcrum 1 2 3 1 quarter 2 quarters 3 quarters 1 quarter 1 quarter 1 quarter 4 4 quarters 1 quarter Data Table 2. First-class Lever, Fulcrum at Trial 1 2 3 Effort (Mass) Load (Mass, g) Load (Mass, N) Load distance, m Distance of Effort from fulcrum Ratio: Effort Distance/ Load Distance m. Mass of 500-g Spring scale 62g = 0.61N 62g = 0.61N 62g = 0.61N Spring scale reading, N Effort Force, N Effort Distance, m M.A. Data Table 3. Second-class Lever, Fulcrum at Trial Example 1 2 3 4 etc. Load (Mass, N) 1.47 Load distance, m 0.2 Data Table 4. Third-class Lever, Fulcrum at Trial Load (Mass, N) m. Load distance, M Effort Force, N 80g = 0.78N Effort Distance, m .90 M.A. 1.9 Effort Force, N Effort Distance, m M.A. m. 1 2 3 Questions A. In Experiment 1 you calculated the ratios of the measured distances, i.e. the ratios of Effort Distance/Load Distance. What is the significance of these ratios? How did your calculations compare to your expectations? B. The spring balance is reasonably accurate for determining the load mass. However, the spring balance weighs 62 grams. Explain how to use the Workin = Workout principle to verify the mass of the spring balance. C. After examining the 1st class lever data what kind of general statement can be made with regards to mechanical advantage and the relationship of load distance to effort distance? D. What happens to the mechanical advantage for 2nd class levers as the load moves further away from the fulcrum? E. What is the significance of the mechanical advantage of class 3 levers? F. What class lever is represented by a fishing pole? Why? G. What kind of lever is represented by an oar used in rowing? Why?
