5 Minute Check9/28/15

1. Why would you want to have only 1 variable in an experiment?

2. What is the difference between the control group and the experimental group?

Today’s Standard:1.8 - The student will identify the control(s) and dependent and independent variables in an investigation.

First we need to finish our foldable from Friday

Taking care of business

The Scientific Method involves a series of steps that are used to

investigate a natural

occurrence.

Link

Step 1- Problem There are 2 parts to this:

1. Make observations using your 5 senses to gather information on a topic of interest

2. Develop a question or problem that can be solved through experimentation.

Ask yourself: Why? How? What?

*Remember it must be something that is measurable.

Step 2- Hypothesis1. Educated guess about how things work.2. Prediction3. Use If, then statements

◦ If ____ [I do this], then _____ [this will happen]4. Focus on one variable only.

Example: If soil temperatures rise, then plant growth will increase.

Step 3- Experiment1. Tests your hypothesis.

◦ Is it accepted (right) or rejected (wrong)?

2. Change only one variable at a time.

3. Use a control or control group (A group that has nothing done to it. Standard used for comparison in an experiment.)

4. Record data in a table – Results are your dependent variable

5. The outcome must be measurable (quantifiable).

6. In order for results to be valid, conduct several tests.

Step 4- Analysis1. Modify the procedure if needed.

2. Confirm the results by retesting.

3. Reduce the data Average (Mean)

4. Graph the data to look for trends & relationships

Step 5 - Conclusion

1. Include a statement that accepts or rejects the hypothesis.

2. If hypothesis is rejected, give possible reasons for the difference between your hypothesis and the experimental results.

3. Make recommendations for further study and possible improvements to the procedure.

Steps Example

Problem Peter

Hypothesis Has

Experiment Every

Analysis Answer

Conclusion Correct

So how do I remember all these steps???

Date Title Page #

09/21/15 What is Science? 1

09/25/15 Scientific Methods Flip book 2

09/28/15 What are variables 3

Unit 2 Procedures of a Lab

What are variables?It is what changes during experiments

Independent Variables

The one thing that is changed in an experiment

This variable makes one test “independent” of another test

On a graph it is on the x-axis (along the bottom)

Dependent Variable

The result of the experiment

The effect caused by the independent variable.

The data – “What is measured”

This “depends” on what you changed

On a graph, it is on the y-axis(along the vertical side)

Controlled Variables

Things that are kept constant (the same) by scientists

These allow for a fair test.

In a scientific experiment, the control is the group that serves as the standard of comparison.

The control group may be a “no treatment" or an “experimenter selected” group.

The control group is exposed to the same conditions as the experimental group, except for the variable being tested.

All experiments should have a control group.

Controlled Group

Independent Variable is

Review / Posters

1. A study was done to find if different tire treads affect the braking distance of a car.

◦ Independent Variable: ________________

◦ Dependent Variable: __________________

◦ Control Variable: __________________

Let’s look at some examples

2. The time it takes to run a mile depends on the person’s running speed.

◦ Independent Variable: ________________

◦ Dependent Variable: __________________

◦ Control Variable: __________________

Let’s look at some examples

3. The height of bean plants depends on the amount of water they receive.

◦ Independent Variable: ________________

◦ Dependent Variable: __________________

◦ Control Variable: __________________

Let’s look at some examples

4. The higher the temperature of the air in the oven, the faster a cake will bake.

◦ Independent Variable: ________________

◦ Dependent Variable: __________________

◦ Control Variable: __________________

Let’s look at some examples

5. Lemon trees receiving the most water produced the most lemons.

◦ Independent Variable: ________________

◦ Dependent Variable: __________________

◦ Control Variable: __________________

Let’s look at some examples

6. An investigation found that more bushels of potatoes were produced when the soil was fertilized more.

◦ Independent Variable: ________________

◦ Dependent Variable: __________________

◦ Control Variable: __________________

Let’s look at some examples

7. Students measured the temperature of the water at different depths in Lake Skywalker and found that the temperature varied.

◦ Independent Variable: ________________

◦ Dependent Variable: __________________

◦ Control Variable: __________________

Let’s look at some examples

8. The amount of pollution produced by cars was measured for cars using gasoline containing different amounts of lead.

◦ Independent Variable: ________________

◦ Dependent Variable: __________________

◦ Control Variable: __________________

Let’s look at some examples

9. Four groups of rats are first massed (weighted) and then fed identical diets except for the amount of vitamin A they receive. Each group gets a different amount. After 3 weeks on the diet, the rats’ masses are measured again to see if there has been a decrease.

◦ Independent Variable: ________________

◦ Dependent Variable: __________________

◦ Control Variable: __________________

Let’s look at some examples

What is the difference between a an independent variable, dependent variable, and control variable?

Closing

5 Minute Check9/29/15

1. Today we are meeting with the councilors in the theater

Today’s Standard:1.8 - The student will identify the control(s) and dependent and independent variables in an investigation.

5 Minute Check9/30/15

1. What are the steps to the scientific method?

2. What are:A. Independent VariableB. Dependent VariableC. Control Variable

Today’s Standard:1.8 - The student will identify the control(s) and dependent and independent variables in an investigation.

Friday is going to be our test on Scientific method, and variables

Taking care of business

Independent Variable: a factor that’s intentionally changed by the experimenter.◦ Example: different amounts of water to the same type of plant

Dependent Variable: Results from your data◦ Example: The plant that receive 20ml of water each day grew

6cm in one month. The plant that received 10ml of water each day grew 2½cm in one month.

Control Variable: What you control that stays the same.◦ Example: Using the same species of plant, using the same

type of soil, using the same type of water, giving both plants the same amount of sun, using the same size pot.

Let’s review from Monday

Mrs. Hunt Says

Class Says

Independent Variable What Gets Changed “WHAT I DO”

Dependent Variable The results “DATA”

Control Variable What stays the same

Control Group Group that Does NOT get changes to them

Let’s try a little shout out

Date Title Page #

09/21/15 What is Science? 1

09/25/15 Scientific Methods Flip book 2

09/28/15 What are variables 3

09/30/15 Controls and Variables 4

Unit 2 Procedures of a Lab

Let’s read some examples from the worksheet Scientific Methods controls

and Variables

Let’s read some examples from the worksheet Scientific Methods controls

and Variables

Turn to a neighbor and explain the difference between a control group and the control variable.

Closing

5 Minute Check10/01/15

Two groups of students were tested to compare their speed working math problems. Each group was given the same problems. One group used calculators and the other group computed without calculator.

1. What is the Independent, Dependent and Control Variable?

Today’s Standard:1.8 - The student will identify the control(s) and dependent and independent variables in an investigation.

Tomorrow is our test on the scientific method and variables

Taking care of business

Date Title Page #

09/21/15 What is Science? 1

09/25/15 Scientific Methods Flip book 2

09/28/15 What are variables 3

09/30/15 Controls and Variables 4

10/01/15 Penny Drops Lab 5

Unit 2 Procedures of a Lab

Question/Problem: Compare how many drops of tap water vs. how many drops of soapy water a penny will hold? Hypothesis: I think a penny will hold more ___________ water.Why: _____________________________________________________________ Experiment:Materials: Penny, Eyedropper, Tap Water, soapy water, 2 paper towels, calculator Procedure:Put the penny on a flat surface on top of a paper towel.Use the eye dropper to drop tap water on the penny, one drop at a time.Count the number of drops until the water spills over the edge of the penny.Record your data.Repeat steps 1 -4 for a total of 5 trials.Use the eye dropper to drop soapy water on the penny, one drop at a time.Count the number of drops until the water spills over the edge of the penny.Record your data.Repeat steps 6-8 for a total of 5 trials

Today we are going to perform the Penny Drops Lab

5 Minute Check10/02/15

1. In our experiment yesterday what do you think was our independent variable?

2. What was our dependent variable?

3. What was our control variable?

Today’s Standard:1.8 - The student will identify the control(s) and dependent and independent variables in an investigation.

After your test you are going to work on the blue packet What is inside the Earth which is due 10/8

Taking Care of business