Act as my workshop production assistant. Use only the attached Pendulum Source Packet and fictional observation sheet. Create three finished files: a one-page student investigation, a teacher review checklist and a three-question quiz with a separate answer key. The lesson is a 20-minute browser investigation for secondary students. Include a prediction, a controlled comparison and a reflection. Preserve the small-angle assumptions, units and distinction between period and one-way swing. Include one sketch or labelled diagram. Use an uncluttered teal and coral style. Inspect the files you make, correct any mismatched facts and tell me what you changed. If file creation is unavailable, say so and give separately labelled copy-ready sections. Mark missing curriculum information. Finish with the files and one question for the teacher.