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Measurment - PowerPoint PPT Presentation

Measurment. Science 8 Ms. Drake Brookville Intermediate School. Measurement. A way to describe objects and events with numbers; quantitative description. Standards of measurement needed to be universal; they need to be agreed upon by people all over the world.

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Measurment

Science 8

Ms. Drake

Brookville Intermediate School

• A way to describe objects and events with numbers; quantitative description.

• Standards of measurement needed to be universal; they need to be agreed upon by people all over the world.

• Every measurement has a number and UNIT!!

• Look at the digit to the right of the place being rounded

• If digit is 0-4, digit being rounded stays the same

• If digit is 5 or more, digit begin rounded increases by 1

• Look at the digit being rounded to. Then look at the digits to its right. If those digits are to the right of a decimal, they are removed. If they are to the left of a decimal change them to zeros.

• Metric system

• Easier to use than the standard English system

• System represents multiples of 10; DO NOT use fractions

• Some units include: meter, kilogram, liter, and second

• Length, Width, Height

• Tools: Ruler, Meter Stick, Tape Measurer

Unit: METER

• For Solid Regular Objects

• Perimeter- distance around the object (meter)

• Area- length * width (meter squared)

• Volume- length* width* height (meter cubed)

• Circumference- distance around a circle (meter)

• How much space matter

occupies

• Tools (liquid): Graduated Cylinder, Beaker, Flask

Unit: LITER

• Water in a graduate has a curved surface called the meniscus. You always read the graduated cylinder at eye level.

• Always check the unnumbered marks on a graduate to see how many sections there are and what they measure.

• We use a method called water displacementto determine their volume. Displacement is the change in the height of water when a non-regular shape is added.

• Put some water in a graduate. Record the volume of the water. This is your initial volume.

Initial Volume

Final Volume

Mass record the new volume level. This is your final volume.

• The amount of matter an object has

• Tools: Balance, Scale

Unit: GRAM

• Use a triple-beam balance to measure an object’s mass.

Time record the new volume level. This is your final volume.

• How long it takes an event to happen

• Tools: Stop Watch or Clock

Unit: HOURS, MINUTES, SECONDS

Temperature record the new volume level. This is your final volume.

• The measure of how hot or cold something is

• Tools: Thermometer

Unit: C

• H20 freezes at 0 degrees Celsius and boils at 100 degrees Celsius.

Tools of the Trade record the new volume level. This is your final volume.

Density record the new volume level. This is your final volume.

• Density is a comparison of how much matter there is in a certain amount of space.

• People in a square: Which square is more dense?

What is Density? record the new volume level. This is your final volume.

• Density = mass OR mass ÷ volume.

volume

• Units for density: g .

cm3

ALWAYS REMEMBER UNITS!

Let’s try a denisty problem together. . . record the new volume level. This is your final volume.

• Frank has a paper clip. It has a mass of 9 g and a volume of 3 cm3. What is its density?

• Frank also has an eraser. It has a mass of 3 g, and a volume of 1cm3. What is its density?

Work on these problems with your table group. . . record the new volume level. This is your final volume.

• Jack has a rock. The rock has a mass of 6 g and a volume of 3 cm3. What is the density of the rock?

• Jill has a gel pen. The gel pen has a mass of 8 g and a volume of 2 cm3. What is the density of the rock?

Try these on your own. . . record the new volume level. This is your final volume.

• Al’Licia has a watch. It has a mass of 4 g and a volume of 2 cm3. What is the density of the watch?

• Mia has a wallet. It has a mass of 15 g and a volume of 5 cm3. What is the density of the wallet?

Liquid Layers record the new volume level. This is your final volume.

• If you pour together liquids that don’t mix and have different densities, they will form liquid layers.

• The liquid with the highest density will be on the bottom.

• The liquid with the lowest density will be onthe top.

Liquid Layers record the new volume level. This is your final volume.

• Which layer has the highest density?

• Which layer has the lowest density?

• Imagine that the liquids have the following densities:

• 10g/cm3. 3g/cm3.

• 6g/cm3. 5g/cm3.

• Which number would go with which layer?

Liquid Layers- Try with your neighbor record the new volume level. This is your final volume.

• Which liquid has the highest density?

• Which liquid has the lowest density?

• Which liquid has the middle density?

Liquid Layers- Now try on your own! record the new volume level. This is your final volume.

• Imagine that the liquids on the right have the following densities:

• 15g/cm3 10g/cm3

• 3g/cm3 9g/cm3

• 7g/cm3 12g/cm3

• Match the colors to the correct densities