Lab Safety Policies  Don’t stand on lab chairs  Don’t sit or stand on lab tables  No dangling jewelry or loose clothes.  No open toed shoes.  Be careful.

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Presentation transcript:

Lab Safety Policies  Don’t stand on lab chairs  Don’t sit or stand on lab tables  No dangling jewelry or loose clothes.  No open toed shoes.  Be careful with sharp corners.  Recall location of phone and first-aid kit.  Report ALL injuries 1

Overview of Labs Lab 1Introduction to Roller Coaster Design Lab 2Energy Losses Lab 3Circuit Prototyping Lab 4Speed Sensor Calibration Lab 5Building Session #1 Lab 6Building Session #2 Lab 7Building Session #3 Lab 8Final Construction - Preliminary Testing of Design Lab 9Final Testing of Design Lab 10Oral Presentations

Roller Coaster Dynamics 2: Energy Losses - 2

Agenda  Experiment to calculate Static friction coefficient  Work on the post-lab data analysis for circular arc and half-horizontal loop while waiting for your team’s turn

Lab Activities (Part 1)  Lab Apparatus Ramp (Static Friction)  Group Rotation Data will be collected at the front table by each team. Each team will take turns rotating to the table and collect data with one ball on a total of three apparatus. Each group will be notified when it is their turn to rotate to the front table. Each group should record their data on the printed worksheet at the front table and on the computer at the instructor’s station.

Ramp Apparatus - Slippage  In the lab you will determine the value of angle, β, at which the conjoined balls begin to slide down the ramp. W = mg motion β Body doesn’t slideBody just begins to slide W = mg β NO MOTION  From β you can calculate Θ C, the angle above which you can expect slippage of a single ball on your roller coaster (with increased energy losses). The calculation is in the lab procedures.

Vertical Loop Apparatus – G force For consideration only, you will not be actually using this device in the lab.

Assignments and Reminders  The post-lab data analysis should be ed to instructor by midnight on Friday.  Instructor will send your team comments based on your calculations. Therefore you will have the correct results for the memo.  Weekly lab checklists, Memo Grading Guidelines and Lab Participation Agreement must be included with the weekly memos.  Lab Memo 2 (team) is due in Lab 3  Update Project Notebook