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Mass Lab - PowerPoint PPT Presentation


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Mass Lab. The metric system is a system of measurement used throughout the world by scientists. The basic unit of measurement for mass is the gram . . Purpose: To practice measuring objects in grams and convert those units to decigrams, milligrams, and kilograms. Background:

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mass lab

Mass Lab

The metric system is a system of measurement used throughout the world by scientists. The basic unit of measurement for mass is the gram.

slide2
Purpose:To practice measuring objects in grams and convert those units to decigrams, milligrams, and kilograms.

Background:

The metric system is based on the number ____. Because of this, it is easy to convert units of measurement into larger or smaller units, depending on what you are measuring. For example, if I measured the mass or an elephant, I would use __________ grams. But if I wanted to measure the mass of a butterfly, I would use ______ grams.

10

Kilo

Milli

calculate
Calculate
  • There are _____ cg in a gram.
  • There are _____ mg in a cg.
  • Therefore, there are ______ mg in a gram.
  • One decigranis equal to ____ cg.

100

10

1000

10

procedures
Procedures
  • Move all weights to zero and confirm that the arm is balanced at the zero mark
  • Place your first object on the pan
  • Move the 100s weight over until the arm drops below zero, then move it back one grove and lock it in place. Record this number.
  • Repeat for the 10s weight. Record this number.
  • Slide the 1s weight over until the arm is balanced at zero. Record this number to 1 decimal place.
  • Add up the total mass of the object.
  • Repeat for the remaining 9 objects
  • Convert to decigrams, milligrams, and kilograms
analysis questions
Analysis Questions
  • Draw a sketch of the scale and label: pan, weights, arm, zero mark
  • Why should your balance read zero before you place an object on the pan?
  • What object had the largest mass? How many grams?
  • What object had the smallest mass? How many grams?
  • Was it easier to find the mass of an object with a lot of mass or a little amount of mass? Explain why.