1
Which is an example of a model:
a. globe
b. a shoe
c. a soccer ball
a. a globe
What are the 3 purposes of a model?
to observe, to make and test predictions, to see relationships
What are some human made systems?
pen, car, light, computer, bike
What do models allows us to do?
see things that are too big to study on their own
What is a variable?
anything that can be changed
What is a system?
a group of things (parts) working together for a goal or outcome
What are some examples of Natural systems?
ecosystems, digestive system, skeletal system, solar system, water cycle
In a controlled experiment, one variable is changed in order for the scientist to get accurate r______, see the c____ and e______ r_______, and dr____ c____________
to get accurate results, see the cause and effect relationship, and draw conclusions
In a controlled experiment, how many variables can be tested or changed?
ONE and the other variables stay the same
True or False:
You can take away only one part from the system and it will work the same way
FALSE
You cannot take away a part or else it will NOT work the same way
What is an independent variable?
the thing that you are choosing to change
(what is being tested)
What is the dependent variable?
the outcome or the result
(this depends on the independent variable)
What is the control variable?
things we keep the same