Transcript Metric System

Metric System
7th Grade Notes 2011
Bell Work
Please get our your signed syllabus sheet
Please get out your science journal and begin answering
the following questions in complete sentences
1. What instrument is used to measure length?
2. Why do you think it is important to know how to
measure length?
Metric System
1. Referred to as the international system of
units or SI
2. Based on the number 10
3. Measuring system used by all scientists
4. Used to measure length, volume, mass, weight,
density, and temperature
Length
1.
2.
3.
Used to measure from one point to another
Instrument used to measure length is the metric ruler
Basic unit of length is the meter
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4.
kilometer- km
hectometer- hm
decameter- dam
meter-m
decimeter- dm
centimeter- cm
millimeter – mm
In space, distance is measured in light years
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A light year is the distance light travels in a year
Bell Work 8/17/10
1. What is the metric system used to
measure?
2. What is the metric system referred to as?
3. What is the basic unit for length?
4. In space, what is distance measured in?
Homework 8/17/10
Practice measuring the following items at your
house. Remember to use centimeters as your
unit.
1. The width of your front door
2. The height of a glass or cup
3. One item of your choice
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For each write down the item and the
measurement for the item
Bell Work 8/18/10
Using a ruler and centimeters (cm) measure
the length of the lines on the piece of
paper at your table. Please share with
your partner and don’t write on the paper.
Example: 6.3 cm
• Length of line 1:
• Length of line 2:
• Length of line 3:
• Length of line 4:
Volume
1. Volume is the amount of space an
object takes up
2. Volume can be measured for liquids
and solids.
Volume (cont.)
3. Liquids – The basic unit for liquid volume is the Liter
___________________________L______________________
4. The instrument used to measure liquid volume is the
graduated cylinder
5. When measuring liquid volume you measure
to the meniscus
Volume (cont.)
6. Solids
Basic unit of solid volume is cubic meters (m3)
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cubic kilometer- km3
cubic hectometer- hm3
cubic decameter- dam3
cubic meter-m3
cubic decimeter- dm3
cubic centimeter- cm3
cubic millimeter – mm3
7. The instrument used to measure solid volume is a meter stick.
There are 2 Ways to Measure Solid
Volume
1. Length x Width x Height
2. Water Displacement using a graduated cylinder
Steps
1.
Record the volume of the water in the cylinder
2.
Place the object in the cylinder and record the new volume
3. Complete the following math problem:
Measurement 2 – measurement 1 = volume of the object
Bell Work 8/19/10
1.
2.
3.
4.
What is volume?
What is the basic unit for liquid volume?
What is the basic unit for solid volume?
How do you calculate the volume of a solid?
Bell Work 8/20/10
1. What is the volume of a solid with these
measurements?
Length 3 cm width 2 cm height 4 cm
2. How do you find the volume of an irregular
solid?
1.
Mass
Mass is the amount of matter in an object.
2. The basic unit for mass is a gram
___________________________g_______________________
3. The instrument used to measure mass is a triple beam balance
Bell Work 8/23/10
Please use complete sentences.
• What is mass?
• What instrument is used to measure
mass?
Bell Work 8/24/10
Please use complete sentences.
• What basic units do we use to measure
volume?
• What basic units do we use to measure
length?
• What basic units do we use to measure
mass?
Density
1. Shows a relationship between mass and
volume
2. To calculate density we divide mass by volume
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d=m/v
3. Units for density depend on size of object
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Large objects = kg/L
Small objects = g/mL
Bell Work 8/25/10
Find the density of an object with
1.m=50g
v=5mL
2.m=200kg
v=2L
Temperature
1.
2.
3.
4.
Measured in degrees Celsius
Instrument = Thermometer
Freezing = 0 degrees Celsius
Boiling = 100 degrees Celsius
Bell Work 8/26/10
Please DO NOT touch the microscopes!!!
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What instrument is used to measure
temperature?
What is the freezing point in degrees Celsius?
What is the boiling point in degrees Celsius?
Bell Work 8/27/10
Find the density of the following objects
a. m = 20 g
v = 4 mL
b. m = 60 kg v = 2 L
c. m = 8 g
v = 8 mL
Weight
1. Weight is the measure of attraction
between objects due to gravity.
2. Basic unit of weight is the Newton
(N)
Bell Work 8/30/10
Please get a new pink bell work sheet from
the counter by the sinks.
• What is weight?
• What unit is weight measured in?
• How many centimeters are in a meter?
Bell Work 8/31/10
1. 1000 g = ______ kg
2. 200 mL = ______ L
3. 1 m = ______ Dkm
4. 77 g = ______ mg
Bell Work 8/28/09
1. 25 kg = ______ mg
2. 345 cL = ______ HL
3. 980 m = ______ mm
4. 23700 g = ______ kg
Bell Work 9/1/10
1. 98 Hg = ______ mg
2. 222 KL = ______ L
3. 2706 mm = ______ Dkm
4. 5 g = ______ kg
Bell Work 09/2/10
What is the basic unit for the following?
1. Length
2. Volume
3. Mass
Bell Work 9/3/10
1. What is the abbreviation for cubic
centimeters?
2. What number is the metric system based on?
3. What is used to measure the mass of objects?