WARM-UP
1. A race car can be slowed with a constant acceleration of 11 m/s2.
a. If the car is going 55 m/s, how many meters will it travel before it stops?
b. How many meters will it take to stop a car going twice as fast?
2. You throw a water balloon downward from the roof at a speed of 5.0 m/s. You miss, because you have terrible aim. How fast will it be moving when it hits the sidewalk 4.0 m below?
CLASSWORK
We worked on the warm up problems all period. Here are the solutions to 1A and 2.
You can click on it to make it larger...
HOMEWORK
Homework from Day 24, Day 24.5, and the handout from today is all due Tues, 10/25
Link to the handout ----> LINK
BELOW IS FOR NEXT CLASS:
1. What makes a good procedure, good?
Handout (Here is the LINK, in case you're absent)
I have colored pencils by my desk in case you'd like to do some advanced highlighting :-)
We'll do a Think-Pair-Share with this, so make sure it's good. You'll have an audience ;-)
2. Free-Fall Lab
You'll need to log in to a school Google account to submit this on _____day (10/ . 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
D. Begin!! Fill in data tables, answer questions, work on the procedure, analysis, etc.
3. Lab Report
, then begin
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: 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 one of the sources of error you identified in #2, 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?
WARM-UP:
Our punter is at it again... He kicked the ball straight up, at an initial velocity of 14.7m/s. If the total flight time of the ball is 3.0s, how high does the ball go?
1. List your Givens
2. List your Unknown
3. Choose an Equation
4. Solve! :-)
LAB: How Fast is My Fastball?
Mr Alexander wants to know how fast you can throw an object upwards. Your team will design a lab to calculate the initial velocity of a thrown object. You will choose your materials and your experimental procedure. If you can provide evidence that you threw your object with a faster velocity than Mr Alexander can throw, you will receive extra credit for your team.
Abstract: What is the purpose of this lab?
Materials: What object did you use? What tools did you use to measure with?
Procedure: How did you set up the experiment and how did you take your measurements? Draw the experimental setup, including the path the object took through the air.
Data: Write down your measurements, preferably in a data table.
Calculations: Calculate the initial velocity of the thrown object. Show your work.
Conclusion: How fast did your team throw the object? Were there any errors or other issues which affected your results? How might those errors have affected your results?
Acceleration Lab Work-time (30 min)
- Labs are due Friday at beginning of class
Practice for Acceleration Written Test
- We will have the acceleration written test this Friday.
- The test will include 5-7 problems, as well as 2-3 reading related questions. I will also ask you to define the rules of free-fall and terms like "acceleration".
- Today is the last chance to solve practice problems with Mr Alexander.
- Individually, practice by solving the following problems:
Chapter 3, Page 81, # 80, 81, 82, 85, 90, 92, 100, 102, 110
- Prep for Exam:
Equation sheet is allowed (equations only)
1/2 sheet of notes allowed
Review
Each group will be responsible for posting and explaining one of the solutions on the board. Problem assignments are as follows:
82: Black Shadow (Ramon) 82: SQUAD (Ricky)
85: Zero Gravity (Monique) 85: Triple Dream Squad Krew (of Zircon) (Ariella)
90: Synergy Squad (John) 90: West Coast Physics (Parker)
92: Hustlin Honey's (Koraima) 92: Nasals (Patty)
100: OG Pretty Thugs (Jaden) 100: The Asmaras (Asmara)
110: Velocity Raptors (Esai) 110: Straight Outta Physics (Xiomara)
Answers:
80: 8.0m/s2
81: 33m/s
82: a. 6.0m/s2 b: 0.0m/s2 c. -2.0m/s2 d. -4.0m/s2
85: Car B is greatest at 6.4m/s2
90: a: 140m b: 550m (about 4x farther at double the speed)
92: 920m
100: 7.3m/s
102: a: 6.2m b: 11m/s
110: a: 247m/s2 or 25 times greater than g (gravity)
b: 207m/s2 or 25 times greater than g (gravity)
HOMEWORK:
pg 75 problem 51
Read 86-89 (reading quiz Fri), pg 89 problems 1-3
EXAM on Tuesday, 10/27