Study Hall (8:45 – 9:15) Sharpen all pencils, grab your notebook, ready to begin
Welcome to Science Class
September 15th ( A) , 2014
September 16th (B), 2014
Warm up
The Sandwich – Cookie Challenge
A cookie company has asked us to figure out how much filling will go on a cookie.
Three different labs are conducting the tests, however the lab with the most reliable results, will be awarded the contract
Lab = classroom
Contract = money given to you
Classroom with the most reliable results = eat the cookies at the end of the challenge!
The Sandwich – Cookie Challenge
In this challenge, you must find out how much filling can be placed on the bottom cookie so it is completely covered and it does not leak over the sides
The Sandwich – Cookie Challenge
To complete the challenge, you will be using a penny, a dropping pipette, and a cup of water
Penny will represent the cookieWater will represent the filling
The Sandwich – Cookie Challenge
Do we all agree….that the best cookies have the most filling
possible with no overflowing fillingThat the penny is going to represent our
cookieThat the water is going to represent our
filling
The Sandwich – Cookie Challenge
We will work in pairs for this challengeEach pair will receive a set of materials to
complete the challengeFirst we must identify the criteria and
constraints for the challenge
2.0 The Sandwich Cookie Challenge
On the next blank page, write this title: 2.0 The Sandwich Cookie Challenge
add entry to table of contents
Criteria (goals that must be met)
Constraints (limiting factors)
Determine maximum number of drops of water that will fit on a penny without overflowing
1 pipette
1 cup of water
6 pennies
Draw this table on the page you just labelled List criteria and constraints for this challenge (4 minutes)
2.0 The Sandwich – Cookie Challenge
For today’s challenge, you will work in pairs
I will put you in pairs now and give you your materials in a moment
2.0 The Sandwich – Cookie Challenge
I am now going to model how to use a pipette
Questions?
2.0 The Sandwich – Cookie Challenge Before we start the challenge, you and your partner
must determine the procedure you two are following
Procedure = series of steps that you will follow
Think about our procedure for taking tests / quizzes
I pass out folders
You sit up your folders to make your office / business space
You take the test / quiz
You place everything inside the folders and lay it down on the desk when you finish
Any questions about a procedure?
2.0 The Sandwich – Cookie Challenge
Remember the criteria (goal) and the constraints (limiting factors) when you develop your procedure
Both you and your partner will write down the procedure you are going to follow today
7 minutes to develop and record your procedure
2.0 The Sandwich – Cookie Challenge
Soon the fun will begin!You will be trying out your procedure
and recording your dataHow do we record data in science
class?In a TABLE!
2.0 The Sandwich – Cookie Challenge
Draw this table in your notebook
Trial # # drops of water123456
2.0 The Sandwich – Cookie Challenge
I will now pass out materials….1 pipette1 cup of water6 pennies
2.0 The Sandwich – Cookie Challenge
You will repeat your procedure 6 times (6 trials)
This means you will repeat this challenge 6 times
Both you and your partner must draw the table and record the # of drops of water for each trial
My advice, 1 person drop the water, the other person record the data
After all 6 trials, you both will fill in your table
Questions?
You have 15 minutes – GO!
2.0 The Sandwich – Cookie Challenge
How do we share results in our science class?
SOLUTION BRIEFING!
You will receive 1 sticky note = write the # of drops your recorded for each trial
This means you should have 6 numbers recorded
When I call you up, bring your sticky and I will record your data on a sheet of graph paper that everyone can see
Questions?
2.0 The Sandwich – Cookie Challenge
Project the graph and record each pairs’ data
2.0 The Sandwich – Cookie Challenge
The data I just recorded is known as a Line Plot
You will now get your own sheet with 2 graphs on it
copy what you see in my graph onto your own graph paper (the graph on the left side of your paper)
2.0 The Sandwich – Cookie Challenge
Find the page in your notebook with your data table and write this word: Line Plot
copy the definition (page DIV 27)
The Sandwich – Cookie Challenge
Does everyone understand how we recorded our data on the line plot?
Example: 8 X’s above 24 = 8 students recorded 24 drops of water on their penny (8 trials resulted in that measurement)
Questions?
The Sandwich – Cookie Challenge
Why do you think each pair got different results?
Why do you think our class data was spread out over a large range?
It’s because we all used different procedures!
The Sandwich – Cookie Challenge
Our class data was spread out or distributed over a large number of water drops
This spread of data is referred to as distribution
Copy this down in your notebook:Distribution = spread
The Sandwich – Cookie Challenge
Every group used a different procedure
Copy this down in your notebook:Variation = wide spread of data
The Sandwich – Cookie Challenge
Do you think scientists have data that is spread out or distributed over a wide range
NO!Their data would not be reliable or
trustworthy and people would not believe their research
The Sandwich – Cookie Challenge
Let’s think about….How did you squeeze your pipette?How high was your pipette from the
penny?Was the penny on heads or tails?
The Sandwich – Cookie Challenge
What can we do to make our data more reliable or consistent?
The Sandwich – Cookie Challenge
We can create a classroom procedure
With 1 procedure, we can all follow the same steps
Do you think this will make our data more trustworthy?
The Sandwich – Cookie Challenge
On the next blank page, record these 2 vocabulary words
Repeatable: Replicate:Use the textbook to write the
definition for each word (DIV 29)
The Sandwich – Cookie Challenge
On this same page, record these 3 vocabulary words
Trial: Precision:Range:Use the textbook to write the definition
for each word (DIV 30)
Our Classroom Procedure… 1. Determine who will be recording data and who will be
dropping water droplets
2. Place the penny heads side up
3. Fill the pipette up with water by squeezing the bulb, placing it in the cup of water and releasing the bulb slowly (this will allow water to fill inside the pipette)
4. Hold the full pipette 1 paper clip length above the penny
5. Squeeze the pipette gently so only 1 drop of water falls at a time
6. Count and record each water drop until the entire surface of the penny is full (this means water is near the edge of the penny but not over flowing)
7. Repeat these steps 6 times and record the data
Run the procedure again
You will now repeat the procedure however you must follow the classroom procedure
You will have 10 minutesYou will record your data on a sticky
again and we will graph our results GO!
Follow this Procedure… 1. Determine who will be recording data and who will be
dropping water droplets
2. Place the penny heads side up
3. Fill the pipette up with water by squeezing the bulb, placing it in the cup of water and releasing the bulb slowly (this will allow water to fill inside the pipette)
4. Hold the full pipette 1 paper clip length above the penny
5. Squeeze the pipette gently so only 1 drop of water falls at a time
6. Count and record each water drop until the entire surface of the penny is full (this means water is near the edge of the penny but not over flowing)
7. Repeat these steps 6 times and record the data
2.0 The Sandwich – Cookie Challenge
Project the graph and record each pairs’ data
What’s the point!
Was the data closer together after the 2nd trial?
Why is this?
We used the same procedure!
Scientists must follow the exact steps or the same procedure so their results can be repeated by other scientists. This is the only way scientists can produce reliable, trustworthy data!
Did anyone notice….
During our first trial, half of you received a pipette that had been cut
By cutting some of the pipettes, the water drops were different sizes!
So again, scientists have to make sure they are all using the same materials and the same procedures to produce repeatable and reliable results.
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