Day 27

WARM-UP (10/25/16)

The high-dive board at most pools is 3.00m above the water. A diving instructor dives off the board and strikes the water 1.18s later. USE G.U.E.S.S.

    A. What was the initial velocity of the diver?

    B. How high above the board did the diver rise?

CLASSWORK

1. Quiz --> LINK

2. Free-Fall Lab

    You'll need to log in to a school Google account to submit this on Friday (11/04)  . Try out your account now...

    A. First, review the lab instructions here: LINK

            You'll need to make a copy of the lab report. Once you've saved a copy, share it with your group-mates.

    B. Second, write down any questions you have on the board by the struggle zone

    C. Third, choose roles for this lab LINK

    D. Begin!! Fill in data tables, answer questions, work on the procedure, analysis, etc.

3. Lab Report

SOME TIPS ON WRITING LAB REPORTS: http://www.chem.ucla.edu/~gchemlab/labnotebook_web.htm

Here's what needs to be included in your lab report:

Introduction

Materials:  List all the materials used in your experiment.  

Procedure:  List all steps that your group followed in this experiment.  Include diagrams of your experimental setup.  Your procedure should be detailed enough that another group could follow your steps and get the same conclusions.

Data:  Data should be listed in data tables.  There should be one data table for each trial.  

Analysis:  Answer the analysis questions.  

Conclusion:  Include the following components:

What you did: Reiterate your procedures briefly (including any changes you made).

What you found: Restate any results that you may have calculated (with errors if applicable). You don't need to include the raw data, but if you calculated an average over several trials, state the average (not each trial). Usually you want to report the results as x +/- y (like 2.345 +/- 0.003), where y is the absolute error in x. In this case, you're comparing measured acceleration with actual acceleration

What you think: What do your results mean? Are they good? Bad? Why or why not? Basically, comment on the results. If your experimental error (RAD, RSD) is small or large compared to the inherent error (the error in the standards and equipment used), comment on what this means, too.

Errors: Speculate on possible sources of error. For the error portion:

1. What sources of error did you identify during your experiment?  

2. How many sources of error were sources that your team had control over?

3. For one of the sources of error you identified in #2, suggest a possible way to change the experiment to minimize that source of error. 

HOMEWORK

Quiz next class on 3.3 (free-fall) problems

Copy the problem and answer the questions: https://edpuzzle.com/media/5787f4d0a163208e0e7433f6

0. No Warm-Up

1. Test

2. HW check (pg 89 problems 1-5, vocab:  "Net Force" & "Newton's Second Law")

3. FBD Practice Worksheet

Examples are in the video below. If you choose to watch this in class, use headphones or very low volume while folks are testing...

 https://www.youtube.com/watch?v=Cdw9Vg3o2Jw 

or search: Free Body Diagrams Practice SGHS Physics

4. HW Due Thursday:

Read pg 90-93

Define "Inertia" & "Equilibrium" (if you didn't already,  "Net Force" & "Newton's Second Law")

Do pg 93 #8; pg 95 #9-10