Controlled Experiment
Swingers
Graphs
Plane and lifeboats
Grab Bag
100
Only change one variable at a time.
What is a controlled experiment?
100
If you wanted your pendulum to swing faster in 15 seconds, what would you do?
Shorten the pendulum.
100
In science class, how did we make predictions for future experiments?
Using graphs.
100
What is the relationship between the incline of the flight line and the distance the plane would fly?
The higher the elevation or slope, the less the distance.
100
What is a variable?
Anything that you can change in a system that might affect the outcome of an event or experiment.
200
Listen to the following experiment. What three different variables are in this experiment?
People, shoes, and length of the school (running length)
200
What are the parts in the pendulum system?
Pencil, string, penny, paper clip.
200
What variables goes on the x-axis?
The independent variable.
200
Which angle did we find made the greatest distance when flinging an aluminum ball from out flipper system?
40 degrees.
200
Which would improve the accuracy of your results: using smaller units or using larger units?
Smaller units.
300
In the shoe experiment, what variable did we keep controlled?
Length of run.
300
What was the standard swinger system?
38 cm long string, one penny, released straight out to the side, swing for 15 seconds.
300
What variables goes on the y-axis?
The dependent variable.
300
What is the mass that we added to our plane system?
Paper clips
300
What is a pendulum and where have you seen one?
A mass hanging from a fixed point that is free to swing to and fro is called a pendulum. You might find one in an old clock, at a museum, as a playground swing or in a metronome.
400
In the shoe experiment, what would you do to change this experiment to determine which type of shoe helped someone reach the fastest speed?
Have one person try the different shoes one pair at a time. Run only the length of the school and time her.
400
Which variables made no difference in the number of swings?
Mass and release position.
400
Why is a picture graph useful?
Picture graphs are made on paper, so they are easily stored; they look like the real thing so they don't need precise labeling.
400
What are the parts in the standard flipper system?
Flipper base, flipper stick, 2 small craft sticks, object being flung.
400
Is there a relationship between the capacity of lifeboats and the number of passengers they hold?
The greater the capacity, the more passengers a boat can hold.
500
What are the four variables that we kept controlled in our lifeboat experiment?
1) Even placement of pennies 2) Calm sea 3) Gently placing pennies 4) Size of boat
500
Is there a relationship between the length of a pendulum and the number of swings it makes in a unit of time?
As the length of the pendulum increases, the number of swings decreases. As the length of the pendulum decreases, the number of swings increases.
500
What is a two-coordinate graph and how does it help us make predictions?
A two-coordinate graph shows the outcome of a series of experiments when a variable is changed by steps. We can then draw a best fit line which will allow us to make predictions.
500
What are the three variables we could change in our flipper system?
Angle, spacers and flip stick length.
500
What is a system?
A set of objects that are working together.
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