Transcript 5.1-The process of Science - Homework

The process of Science
Homework
Design an experiment!
Think about what it would
take!
Due
• Monday – 8/29 – Period 1-3-5-7
• Tuesday – 8/30 – Period 4-6-8
• Warning – Mid-Quarters Go
home 9/2 and this will be a
grade on it.
Basics
• Write up the design for figuring out the
answer(s) to the following questions.
• Use the Process we looked at –
• Question
• Hypothesis
• Experimental Design ***** this is the
important one!!!
• What will you do? Step by step. What Materials?
What data will you collect? Prepare a data table.
What Problems will there be in doing this
experiment? How many repetitions / days will it
take?
The Curiosity
• How long is a Day? (first decide
what a “day” is)
• How long is Daylight during a
Day?
• Which direction is North – the
Spin Axis of the Earth?
OK
• How to write it up – Look at your
notes on the scientific process
and follow them!
• Hints:
Process of Science
homework – Part 2/try 2
• The Problem: to come up with a
DESIGN for an experiment.
• The experiment is to figure out
how long a “day” is. (we’ll try the
first one first)
• First – we have to decide what a
day is in a way that we can test!
What’s a Day?
• From the Dictionary:
• The period of light between
sunrise and sunset
• The 24 hour period during which to
earth makes one complete
rotation on its axis
• The part of the day devoted to
work or study
What’s a “day”
• From the “net”:
• The duration of one rotation of the Earth, or
occassionally another celestial body, on its axis. Its is
measured by successive transits of a reference point
on the celestial sphere over the meridian, and each
type takes its name from the reference used…
www.reson.com/Gloss-d.htm
• 1. A basic time increment defined by the earth's
motion; specifically, a complete revolution of the earth
about its own axis. The sidereal day is defined as the
time required for the earth to make one complete
revolution in an absolute coordinate system, that is,
with respect to the stars. The day in common use is
the mean solar day, derived, by means of the equation
of time, from the apparent solar day, which is
determined directly from the apparent relative motion
of the sun and earth.
amsglossary.allenpress.com/glossary/browse
Which definition is best?
• First, which of the definitions is
easily do-able? A couple of them let
you know exactly how to do it!
• “The duration of one rotation of (a)…
body on its axis. Its is measured by
successive transits of a reference
point on the celestial sphere over
the meridian…”
Lets translate:
• “The duration of one rotation of (a)…
body on its axis. Its is measured by
successive transits of a reference
point on the celestial sphere over
the meridian…”
In basic English :
• The time it takes for a particular
point (sun or star) to pass
“overhead” twice.
How can we do that?
• Seems simple enough – just
measure the time for a star or
the sun to cross the meridian
twice.
• We need an accurate watch,
and a way to figure out when
the sun/star crosses the
meridian.
Meridian?
• The meridian is the “imaginary”
line going from the North to
South pole and going directly
overhead.
• For the Sun, that would be
“real” noon. (12:00 is rarely
Solar Noon!) (on Monday 5-Sept-05 the sun’s
transit for Keaau was 12:18)
Transit?
• The crossing of a meridian is
called a “Transit”
• How can we determine the time
of the transit?
Disclaimer
Aloha
I put together these power points for
use in my science classes.
You may use them in your classes.
Some images are public domain, some
are used under the fair-use provisions
of the copyright law, some are mine.
Copyright is retained by the owners!
Ted Brattstrom