Download - May 25 - Unit 2, Lesson 1
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What are related variables? Oftentimes, we see situations where
two variables are related.
For instance, the hotter the temperature outside, the more energy an electric plant has to provide.
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What are related variables? The more a person lifts weights, the
stronger they get
The louder your parents yell at you, the less you listen
What’s another?
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What are related variables? These variables are said to be
related. They are related because one of them is a function of the other –
for instance, how much you tune out your parents is a function of how loud (or how often) they yell
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What are related variables? How strong you get is a function of
how hard you work when you lift weights
When one variable is a function of another, those two variables are related
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What are related variables?• The variable that is a function of
another is called the dependent variable
• The variable that “causes” the other to happen is called the independent variable
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Independent v Dependent variables
• The harder you work when you lift weights, the stronger you get
• What are the two variables?• how hard you work• how strong you get
• Which one is a function of the other?
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Independent v Dependent variables
• The harder you work when you lift weights, the stronger you get
• How strong you get is a function of how hard you work – so…
• how strong you get is the dependent variable
• how hard you work is the independent variable
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Bungee Jumping
Bungee Jumping 2
One more
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In your groups, design an investigation in which you test the effect of different weights on the amount of stretch on a bungee cord.
Bungee cord: rubber bands with paperclip on end
weight: use masses provided (hook onto paperclip)
* Total number of rubber bands used should not change
* Weights should not strike the ground (that wouldn’t be too safe)
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On Your Own (OYO)
pg 101 a – d
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Modeling• As a group, consider the situations
described on pg 102 (MORE #1)
• Create one answer sheet for your group on notebook paper, and answer questions a – d; if you use a table or a list as an answer, be sure to title your list/headings so that other people will understand what you are writing
• Follow the directions and as a group, create a coordinate graph on poster paper that reflects the effect of the price charged on the number of customers
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Density
density of a property of matter that depends on two variables: mass volume
Mass is measured on a scale (we’ll use grams)
Volume of regular shapes is found by multiplying length x width x height
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Density Sample Problem
The mass of a piece of wood is found to be 35 grams
The wood measures 15 cm wide, 2 cm thick, and 4 cm long
draw a labeled diagram that represents this piece of wood and solve the problem
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Density Lab
Does the size of a piece of wood affect its density?
In your groups, design a method to answer the following question. One rule: you must use at least five different sizes of wood.
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Density Lab Assessment On your own, create a report that
contains: lab question short explanation describing mass, volume, &
density + formula list of steps group followed that includes each
team members responsibilities data table will contain at least five different
trials data will have all appropriate units graph of data is properly created and labeled conclusion is reached and results are
explained