IV/DV Powerpoint

1. CIRCLE three unsafe activities in the picture and EXPLAIN
why each is unsafe.

2. Today’s Objective:
You will be able to identify
independent and dependent
variables.

3. The pistol star is FIVE
times the diameter of
Antares.
10,000 times brighter
than the sun!

8. What do you
observe?
What can you
infer?

14. Identifying independent and dependent variables:
Jerry is not happy with the bats his team uses. He claims
that his personal bat is longer and that he can hit the ball
further with it. The coach thinks Jerry is muy loco!
So….Jerry decides to run an experiment to find his answer
to the problem:
Does the length of the bat affect the distance
the baseball travels?

15. Jerry goes to the store and buys 4
identical bats, however, each one is a
different length.
Jerry rents a pitching machine and
begins his experiment.
Using each bat, he hits the ball 10 times.
After each hit, he measures the
distance from home plate to the spot
where the ball landed.
Jerry calculates the average distance he
hit the ball with each bat.

16. Yes! The distance the ball travels.
This is the dependent variable (data).
Great! The length of the bats.
This is the independent variable.
What is Jerry measuring? (The variable he
did not know BEFORE the experiment.)
What is Jerry testing? (The variable he
knows BEFORE the experiment.)

17. (
Whichtypeofbattery Duracellor
)
Energizer keepstheflashlightonfor
?
thelongestamountoftime

18. Independent Variable?
Right! The type of battery (energizer/ duracell.
Dependent Variable?
If you said TIME, you’re absolutely right.
How LONG does the flashlight stay on?
Long suggests length of time in minutes,
seconds, hours, days, etc.
Tough one?!