Show:
Scientific Method
Parts of Experiments
Variables
Metric Conversions
SURPRISE!
100
What is the 1st step of the Scientific Method?
Ask a QUESTION (or state a problem)
100
Define HYPOTHESIS in your own words
HYPOTHESIS is an educated guess or prediction about what is going to happen in an experiment.
100
Define INDEPENDENT VARIABLE
IV is what the scientist changes on purpose
100
State the correct order of the metric units from greatest to least.
Kilo Hecto Deka (base: meter, liter, gram) deci centi milli
100
How many Independent Variables can there be in one experiment? Explain why!
There can only be 1 Independent Variable in each experiment. This is done to test for which change is causing the result!
200
What is the 2nd step of the Scientific Method?
Make a HYPOTHESIS
200
Expain PROCEDURE. In the Cars & Ramps Investigation, what was your procedure for letting the car roll down the ramp?
Procedure is the steps you take to do an experiment (the directions/method/recipe). Procedure in Cars & Ramps was to bring car to the top of the ramp, release the car ranturally (don't push it down), place photogates at the same place for all groups.
200
Define DEPENDENT VARIABLE
DV is what the scientist measures as the result of the experiment.
200
Convert 2.3 Kg = ____________ g
2300 grams
200
The Metric System of Measurement is important to use in science. Why to scientists choose to use this system?
Answers Vary: This is the system used in most of the world. It makes it easier to compare and communicate data.
300
State the 3rd step of the Scientific Method
Design and conduct an experiment
300
A student predicts that a plant will grow taller if it is placed near a window. Write a hypothesis using the 3 IMPORTANT WORDS we use.
Answers will vary: "IF the plant is placed near the window, THEN it will grow taller BECAUSE it is getting more sunlight."
300
What is a CONSTANT variable?
A constant variable is something that stays the same in an experiment.
300
Convert 11 mL = ___________ L
0.011 L
300
How do you know that a kilometer is larger than a meter? Explain why.
Answers vary: K is before base (meters) on the scale. A kilometer is approx. a mile, a meter is approx. a yard. Kilometers are units used in farther distance travel on roads, maps, etc.
400
Explain steps 4 and 5 of the Scientific Method
Collect and analyze data Make a conclusion
400
Explain the difference between the terms MATERIALS and TRIALS.
Materials are the tools or equipment you use in the experiment. Trials are the number of times you do the experiment (usually 3 times).
400
Identify the Independent Variable in this example: Jess thinks that shampoo makes bigger bubbles than dish soap. She makes bubbles with 3 different solutions, plain water, shampoo and dish soap. She measures the size of the bubbles in centimeters.
IV = the 3 different solutions
400
Convert 64 dg = ___________ g
answer: 6.4 g
400
Science Safety: Explain why you do not return un-used chemicals to their original containers.
We do not return un-used chemicals to thier original containers becasue we don't know if that chemical has been mixed with something else. Our instructor will give us only as much chemicals as we need to cut down on waste. We must dispose of chemicals according to Ms. H's instructions.
500
State the 6th step of the Scientific Method. Explain why this step is so important in science.
Communicate results and repeat. We share data to help understand why things happen. Repeating trials is necessary to eliminate mistakes and make sure data makes sense (we usually do 3 trials).
500
***ALL GROUPS!!*** Write a CONCLUSION statement for the following data collected in an experiment. John predicted that a car would roll down fast on the steepest hill. The time between photogate A and B on the steep hill was 0.25 seconds, and the time on the low hill (not steep) was 3 seconds.
Answers may vary: In conclusion, the steep hill makes the car roll faster. The car rolled in 0.25 seconds on the steep hill. The car rolled in 3 seconds on the low hill. John's hypothesis was correct. Next time, John should do more trials.
500
Identify the Dependent Variable in this example: Jess thinks that shampoo makes bigger bubbles than dish soap. She makes bubbles with 3 different solutions, plain water, shampoo and dish soap. She measures the size of the bubbles in centimeters.
DV = size of bubbles in centimeters
500
Convert 5.7 Hm to ___________ cm
answer: 57,000 cm
500
***ALL GROUPS*** Write a conclusion for the following experiment. Mike predicted that giving children candy would make then do more jumping jacks. He gave 50 kids candy and 50 kids no candy. He counted how many jumping jacks the kids could do in 1 minute. The group with candy did 225 jumping jacks in total, and the group with no candy did 303 jumping jacks in total.
Answers will vary. In conclusion, the group with no candy did more jumping jacks. That group did 303 jumping jacks. The group with candy did 225 jumping jacks. The result did not agree with Mike's hypothesis. Next time, Mike could test more students, change the candy to see a different result, time it for longer, change the exercise, etc.