PASS Tutorial

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PASS Tutorial

• Science Measurements
• And
• Use of the formula page ruler

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What is on the side?

• Along the side of the science chart is a ruler.
• What are the units of this ruler?
• How many of them are there?
• What are the smallest divisions of units called?

Centimeters
20 Cm
Millimeters
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We need to measure . . .

• Length in meters, or centimeters, or millimeters.
  
• Volume of a liquid or odd shaped solid, in Liters
  or milliliters.
• Mass remember is always in grams or Kilograms.

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Typical science measurement question . . .

• The pictures above show two organisms. Measure
  their body lengths to the nearest tenth of a
  centimeter. What is the difference between the
  body lengths of the grasshopper and cricket?
  Record and bubble in your answer to the nearest
  tenth on the answer document.

But, thats not all, is it? It wants you to use
some math also . . . . .
Difference, that means subtract, right? Okay,
big little, to the nearest 1/10. . .
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Do you know how to read the ruler?
2.22 cm is just smaller than an inch - Just so
you know!!

• Which of the following shows the length of a
  rubber strip measured precisely to 2.22
  centimeters?

In science, precise means repeatable. So, you
should measure each line more than once!!
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Pay attention to precision requested! Again,
measure more than once!!
Now that you measured, use it to calculate speed!
After all the real reason for math is to DO
Science . . .

• 20 An ant crawled from Point A to Point B in 4.0
  seconds. To the nearest tenth, what was the ants
  speed in centimeters per second?

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You may have noticed . . .

• I have not given you answers today. That is
  because the copy that is placed on the projector
  is not the same size as you have on your
  handout. So, our measurements will be different.
  

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4 The picture shows the position of a ball every
0.25 second on a photogram. Using a ruler,
determine the velocity of the ball.
What do you need to do to answer the
question? Multiply your distance measured by 2,
since we only measured ½ second.

• F 3.5 cm/s
• G 10.5 cm/s
• H 14.0 cm/s
• J 28.0 cm/s

When measuring anything, make sure you measure
from and to the same position, front to front or
back to back.
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Be sure you measure more than once . . .

• The key on the science test to measuring
  problems, is in 9 released tests, only one
  question asked for just a measurement.
• In order to answer correctly, you must measure
  correctly AND calculate correctly. Do not stop
  until you have actually answered the question.
• Do not answer in cm if you want cm/s, calculate
  using your formula page.