Newton's Laws HW

Julie Payette crew on the International Space Station

PDF versions of pages passed out in class.
Due Wednesday, 1/4/2017
Newton's HW page1
Newton's HW page2 

F=ma WRITE UP

F=ma write up instructions

DUE: Friday 1/6/2017

Your #1 objective: demonstrate that Newton's second Law, F=m*a, is true.

Each person needs to prepare their own report.  

Only one name can appear on what is turned in.  

Each person needs to create/make/design their own tables and graphs.

Design:

• State the objective
• Clearly explain the role of each variable – dependent, independent, constant
• Offer a clearly labeled diagram

Data Collection and Analysis:

• Provide a completed summary data table – use a spreadsheet to make this.  
• Be sure to include uncertainty values.
• Explain how the equation was re-arranged in order to linearize the data.
• Provide a graph of a vs. 1/m – include units and error bars for acceleration.
• Provide captions for your table and graph.
• Be sure to staple your raw data
•  – the multiple data tables with various trials – to what you submit

Evaluation:

• State your result.
• How close was your result to the expected?  
• Does the slope of your line match the pulling force?
• Discuss any sources of error

F=ma (Cart) LAB: directions

Proving F=ma

Remember:  You will keep the pulling force the same for ALL trials.  

You will vary the mass of the cart – use 5 different masses.  

You will run 5 trials for each mass.

• Go to the blog and download the spreadsheet template for the F=ma post.
• Save a copy of this ‘velocity template’ file into the folder that corresponds to your period number.
• Set the sampling rate on the motion detector to 25 samples per second.
• Be sure there is at least 20cm between the motion detector and the cart.
• Be sure that the motion detector can ‘detect’ the cart for the entire duration of the trial.
• After you have run what you think is a successful trial, copy and paste 10 position and time data points from Logger Pro into the excel velocity template.  You should paste over the existing data.
• The slope of the velocity-time graph is the acceleration for that trial.  Put this value in the data table you were provided by the instructor.
• Be sure to fill in the value for the pulling force you are using.
• Be sure to fill in the value for the mass that is being used for the 5 trials.
• Calculate the uncertainty for the acceleration by taking the difference between the max and min value and dividing by two.
• Prepare a summary data table with the following columns:  m (show uncertainty), 1/m (show uncertainty), a (show uncertainty).
• Make a graph of a vs. 1/m.  The slope of this line should equal your pulling force.  You can make your graph with excel or use the graph paper provided

F=ma Processing sheet

F=ma Data Sheet

Newton's 3 laws

'zero gravity' plane

Upside Down and Inside Out- OK GO video

'how we did this' OK GO VIDEO
background on Upside down and inside out

physics girl com Zero Gravity Plane Explanation

more on NEWTON'S 3 LAWS at 'Physics Classroom .com'

Bull's Eye

Bull's Eye Lab

Help in 2dimensions.

You're not the first person to struggle with solving 2d kinematics (projectile motion) problems.

Here are a few helpful links....

PhysicsClassroom Projectile Motion (also links to problem solving strategies)

Boston University: Motion in 2 dimensions (algebra-based)

Here are two videos showing how to solve 2-d projectile motion problems.
VIDEO #1
VIDEO #2
if you find better ones, please email me!

Projectile Motion Simulator

Launch a piano over David's head! 

pHet Simulator game will let you explore how changing angles, air resistance, mass, etc. affect the motion of a projectile.

2d Kinematics Practice (Pig Popper problem & friends)

2d kinematics practice problems 

(Pig Popper & Friends)

Texting & driving video

Projectile Lab (10 trajectory apparatus photos)

PROJECTILE MOTION LAB- directions

EXCEL FILE

Solving Vectors Graphically

Here are the practice problems we worked on in class.  These should be done with graph paper & protractor, but do not use Trigonometry.  Solve them GRAPHICALLY.

If you're struggling, here are some good links:
Physicsclassroom.com
Physics EH Video : Someone with excellent chalkboard skills shares vector addition technique video

From PhysicsEH youtube channel

Propagating error

step by step with great examples

ONLINE ERROR PROPAGATION TUTORIAL

How to propagate error through calculations.

from Physics at Columbia University Online Tutorial.

Vectors Practice Problems

Vector Practice Problems
Note: all problems must be drawn as scaled vectors, HOWEVER, you may solve them using trigonometry.
(just noticed #5 has a snag..... see if you can figure it out & we'll discuss in class).


More help on vector addition can be found at Physics Classroom.com.

Rise and Fall of the Ball

Rise & Fall of the Ball Lab

Up

vs. 

Down

Big throw

vs. 
Small throw

What happens to the acceleration of the ball?

Test 1 Review KEY

First test of the year, 10/11.
Bring a calculator & a lucky pencil.
All questions will be pulled from Homework OR this Review.

Software at Home

Directions to get your OWN copy of LoggerPro on ANY computer at home
Vernier makes this software available for free to all teachers and students who use their products.
You need a password to install this software- this has been provided in class OR you can email your instructor.

Lab Write up: objects (Books) of varying mass

Lab write up for Book Drop Lab

a good graph

likely there are better... but, as requested, here's an example of the details that should be included in a graph.

A pretty good data table.

Here's an example data table.  

Most of these formatting things (number of digits displayed, centering, text wrapping, text bold, border lines) can be found by hitting the key strokes "Ctrl + 1" on a PC or "open apple/command + 1" on a Mac.  My second favorite short cut keys. 

Here are some other examples:

IB (internal assessment) lab guidelines

Labs shouldn't make you feel like Beaker.

From "nothing nerdy"'s website: IB physics Internal Assessment Guidelines  with links to checklists.


From Dingrando and Reilly at ISM (International School Manila): the same rubric as above, formatted as a handy grid.
For our first labs, the design has been done for you.  You will be evaluated based on 'Data Collection & ProcessingData Collection and Processing' AND 'Conclusion and  Evaluation'

Here's a Kemper-version... very detailed handout - I created it using the IB guidelines above, with some added bonuses.

HW: More Kinematics!

Flower Pot falling.  

If we knew how fast it had been falling,
we'd have a good idea whose balcony it fell off of.

photo stolen from:
https://www.askideas.com/50-most-funniest-situation-pictures-that-
will-make-you-laugh-everytime/

1d Kinematics Practice due Friday, 10/7

Some Hints:
*acceleration due to gravity is -9.8m/s^2

*keep one direction positive and one negative (customary to make down=negative).

*'dropped' objects have no initial velocity.

HINTS- solving kinematic equations

1. Draw a picture
2. Write down all the known variables
     Do you know:
                 time?
                 displacement?
                 initial velocity?
                 final velocity?
                 average velocity?
                 acceleration?
3. What are you trying to find out? (What is/are your unknowns?)
4. Choose an equation from the kinematics toolkit....
       which equation contains the variables you know & want to know.
5. Substitute numbers for variables in your equation.
6. Solve for your unknown(s).
7. Check your answer ( put through calculator again, check if answer is in reasonable quantity and correct units).

Physics Classroom.com Kinematics Equations Help

Physics Classroom.com is AWESOME.

Here's a link to hints for 1-d kinematics equations.  

HW due 9/23

This next week, we'll delve more into all of these topics.
1) Significant figures: go to the signficant figure 'self -check' link OR sig figs 2.   Quiz yourself until you feel comfortable determining the number of significant digits in a number. If you haven't learned about sig figs in another class, it might be best to save this assignment until after 9/19.
2) Race Car Problem- we'll talk about position, velocity and acceleration on Monday, 9/19.  Afterwards, you should feel much better prepared for this assignment.
3) Position vs. time graphs: this is an in class assignment- we collected data on 9/15.  We'll analyze it in lab groups at the beginning of next week.

HW Race Car

RACE CAR PROBLEMS
A racecar accelerates from rest down a track at a constant rate of 18m s-2 for 6 seconds.  At the finish line (after 6 seconds), it deploys a parachute in order to slow down more quickly.  It stops over a distance of 200m.

1. What is the velocity of the racecar after 6 seconds?
2. What was the acceleration of the racecar after the parachute deployed?
3. How long did it take the car to stop after the parachute deployed?
4. Make a graph of velocity vs. time for the path of the racecar.
5. Use this graph to find the distance the car traveled during the initial acceleration.

Conversion practice answers- UPDATED!

Conversion practice answers! (click this link to open a PDF file)

if you need some extra help with these, PLEASE stop by lunch or flex!

Significant Figure ONLINE PRACTICE

HOW MANY SIG FIGS IS 0.00054687? 

online practice for significant figures,

same sort of tutorials for scientific notation, conversions and more! can be found here.

Significant figure rules

Significant figure counting rules

Significant figures: addition, subtraction, multiplication and division

Conversions Practice

The Mars Orbiter, a $125million satellite, failed to orbit Mars.

It came too close to the planet, and was destroyed by Mars' atmosphere.

The most likely cause of this loss?

a metric/English unit conversion error.

oops.

This page is due on Thursday, 9/15 AT THE BEGINNING OF CLASS.

Here's a video that explains dimensional analysis, the technique we used today in class.

Please write your calculations out with full numerators, denominators and UNITS.  It might feel like it's the long way now, but it will save you hours of headache later!






Here are some other noteable Great Miscalculations

Final Spreadsheets & Graphs Activity

Final Spreadsheet Activity
to be done INDIVIDUALLY
and graphs to be printed out.

Metric Prefixes

Image from University of Nebraska-Lincoln http://astro.unl.edu/classaction/tables/intro/si_prefixes.html

Excel Part 2

comic by xkcd

Today, we'll make some graphs.
This year, we'll make many graphs.
Graphs will help us interpret complicated data...

Here are the directions.
EXCEL Part 2

Excel Part 1

http://www.tylervigen.com/spurious-correlations
more such awesome graphs can be found here.
Real data.  Real Science...

Excel Part 1

SI Units

Astronomical Clocks: 

tell the location of celestial bodies and gong once/hr.  

There is no 'time' on the dial 

& the clock moves using weights.

This clock, mounted in Prague's Old Town square, 

has parts dating from 1410AD.

In class activity:  9/2
All groups will have 20 minutes for this activity.
You will research your question below, and, find an image to submit to google classroom for your presentation.

Group #1: What does "SI Unit" mean? What is "SI"?  A very brief history of SI.

Group #2: What is a derived unit? Provide several examples.  Explain how these are different than the fundamental units.

Groups #3-9:
you will race to 1) determine the 7 fundamental units, and then, 2) find your instructor to 3) determine YOUR unit.  Then.  You will:
1) determine what your unit can be used to measure
2) what is its symbol

3) how is this unit is defined- might involve a *tiny* bit of history
4) find an everyday thing- how much of this unit?
(for example... a very much not SI, non-metric example... a student at Cleveland is 5.5 feet tall... Do NOT use metric prefixes before your unit... as in the height of Cleveland high school is 10decafeet tall...).

Welcome!

Welcome to SL Physics (Kemper) at Cleveland

Libby Cross uses some physics to help
Cleveland girls soccer win against Franklin.  October 2015.
photo credit: Jonathan House, Portland Tribune

Great to see you here!

This is the site is where I'll post links to assignments, extra support sites when I find them, and a calendar of due dates.  You can subscribe to get updates & reminders when posts and new assignments are added.

First day! Physics survey.

Crankshaft mechanism;
designed and illustrated by al-Jazari
in "Book of Ingenius Devices" 1206 AD

SURVEY!
I'll use this information to better fit this class to you.
I'll only share answers as 'group' data-
as in "most students in this class have taken Chemistry",
NOT 'Alejandro took Chemistry'.