Next class: CH1 Exam & Lab #2: Velocity
WARM-UP:
How can you calculate an average?
Give three examples of units we can use for speed.
Search the web for formulas for
position Δd = df-di/Δt
velocity
acceleration
In the velocity and acceleration equations, what is changing over time?
CLASSWORK
Lecture/Notes: Speed vs. Velocity & Practice Problems
Moving Man Simulation
What does physical motion look like on a graph?
HOMEWORK
1. Period 1: Complete pages 1-2 of the Physics Moving Man Simulation
Period 5: Complete pages 2-3 of the Physics Moving Man Simulation
2. ALL: CH 1 Exam next class:
- vocabulary: precision, accuracy, indep variable, dep variable, linear, inverse, best-fit
- skills: dimensional analysis, graphing, significant digits, measurement and uncertainty
3. ALL: 1/2 sheet of notes for the exam. Single Side only. This is a required HW assignment
***Teacher Notes***
Prep with reading for HW, and group discussion to review (7 topics, as discussed with Julie Z).
Make video showing some of the things not to do.
- Measuring one data point on 6 different runs...Constant!
- Using data during acceleration instead of during constant period (terminal velocity time)
Wednesday, August 31st, 2016
#Goals: SWBAT...
1. ...use data to create graphs
2. ...choose a proper location for a particle in particle diagrams
3. ...draw correct particle diagrams
4.
WARM-UP:
A. Pull up chapter 1, and answer questions 25-27 on page 19
B. I still need a group name for your group, by the end of the day. Write it here: https://docs.google.com/spreadsheets/d/1dGGqrsv05QiIc_LKSh15f-LkLtV4pKCmXYZIih_i7BE/edit?usp=sharing
CLASSWORK
1. CH 1 Exam Review: LINK
2. Group Evaluations
fill out the "Name" "Role(s) Assigned "Role(s) Actually Completed" sections in class.
complete the last two columns at home. Due Friday.
3. HW Review
Part 2: Picturing Motion
Read CH 2 pg 31-33. Answer the following:
- Motion Diagrams
1. In figure 2.2, what is changing? The runner, or the background?
2. So, what is in motion?
- Particle Model
3. Where would be the best place to put the particle on a runner? Say why each of the following would be good or bad.
A. Right foot.
B. Belly Button.
4. Solve pg 33 1-3
4. Velocity Inquiry Lab Prep
TITLE: Constant Velocity
Your team will design an experiment to compare the position of an object moving with constant velocity over a series of time intervals. Discuss with your group the variables that will need to be measured to prove that an object is moving with constant velocity. Decide which variable being measured will be dependent and which will be independent.
Measurement Equipment
You will have access to several pieces of lab equipment. There are ball bearings, ramps, meter sticks, rulers, etc. You may use objects from home if you like. Make a list of all the equipment you expect to use. You are allowed to make changes during the lab.
Discuss with your group how you could take the proper measurements to prove that your object is moving with constant velocity. Put together a list of procedures that you will follow. Perform at least three trials.
Graphing
After you take your measurements, construct a graph of your data and draw a best fit line. Construct one graph for each set of data that you take. Calculate the slope of the best fit line.
Percent Error
When you have calculated the slopes, take an average of the three values measured without the phone. Also take an average of the three values measured with the cell phone. Now compare the average value with the value that is farthest from the average. You can calculate your percent error as follows:
percent error = (average - outlier) x 100
average
For all scientific experiments we aim for a % error that is less than 5 and preferable less than 1. The smaller the better. How did your team do? Answer the following questions.
What sources of error did you identify during your experiment?
How many sources of error were sources that your team had control over?
For each of the sources of error you identified in problem two, suggest a possible way to change the experiment to minimize that source of error.
Lab Report
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: Graph your data. There should be one graph per data table. Calculate the slope for each graph. Take a mathematical average for the slopes. Use the average slope to write an equation that for the line. Calculate the percent error for your data. Answer the analysis questions.
What sources of error did you identify during your experiment?
How many sources of error were sources that your team had control over?
For each of the sources of error you identified in problem two, suggest a possible way to change the experiment to minimize that source of error.
Conclusion: Answer the following conclusion questions.
What is the relationship between x and t for constant v?
Were you able to achieve constant velocity? How can you tell?
Homework:
Complete CH 1 Exam Review Problems. Due Friday
Complete Group Eval. Due Friday
Next Class:
Part 1: Watch https://edpuzzle.com/media/5782b02627ed9aaf1338528d
- answer the questions
- Poster Eval
- Constant Velocity Lab Begins