Physics 1 – Sept 5, 2017 P3 Challenge – Do Now

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Presentation transcript:

Physics 1 – Sept 5, 2017 P3 Challenge – Do Now Meet with your assigned group for ave and Std dev to check your answers and resolve any differences in answers. Post your common answers on the board for the class. Then copy the common answers into your lab and continue on. (This will also serve as the homework check.)

Objectives and Agenda IB 1.2 Uncertainties and Errors Determine the error present in graphs Agenda for IB 1.2 Uncertainties and errors Lab to investigate Error in Graphs Assignment: Complete the Graphing Lab Error analysis.

Graphing Lab Overview Collect Mass and Volume Data for water for volumes of approx. 5, 15, 25, 35, 45 mL. Record the actual volume used as accurately as possible. Record the mass to 3 decimal places using a triple beam balance. Share your data with the class on the board and copy all class data. Find ave and std dev of all volume and mass data. (Divide and conquer.) Plot points (mass vs volume) with error bars for each point reflecting std devs Determine min/max lines to asses uncertainty in slope and intercept. Determine best fit line with uncertainties for the density of water. Compare results to accepted 1.00 g/mL with a % error.

Exit Slip - Assignment If the mass of 7.33 +/- 0.3 mL of an unknown liquid is found to be 6.389 +/- 0.05 g, determine the density of this liquid. Use error propagation to determine the uncertainty in your answer. What’s Due on Thurs Sept 7? (Pending assignments to complete.) Graphing Lab Activity - complete What’s Next? (How to prepare for the next day) Read IB 2.1 (1 D) p35-43