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Bell Work

In Basket by the Door

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All answers for the crossword puzzle are from the notes

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Don’t forget to use Hand Sanitizer

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What’s wrong with this recipe

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a decimal system of measurement based on units of 10

SI System - The international system of measurement and units

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When Measuring… Use…

length meters (m)

volume liquid liter (L)

volume solid (lxwxh) (cm3)

mass grams (g)

temperature Celsius (°C)

*Mass is a measure of amount of matter in an object.

*Volume is amount of space an object takes up.

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Temperature Celsius (°C)�

  • Temperature is the measure of the average kinetic energy of an object.

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    • Kinetic Energy is the Energy of motion

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These are the main SI units we will be working with.

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The Stair Step for Units

Kilo (k)

Hecto (h)

Deka (da)

Base Unit

m-l-g

Deci (d)

Centi (c)

Milli (m)

As you move down

Move decimal to the right

As you up

Move decimal to the left

1m = 1000mm

1m = 0.001km

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Lets Practice�

  • 1500ml = ______ L
  • 25 m = ______ km
  • 2000 mg = _______ g
  • 100kg = ________ g

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Measuring Length

Ruler: http://www.k12math.com/math-concepts/measurement/ruler-cm.jpg

How many millimeters are in 1 centimeter?

What is the length of the line in centimeters? _______cm

What is the length of the line in millimeters? _______mm

What is the length of the line to the nearest centimeter? ________cm

HINT: Round to the nearest centimeter – no decimals.

1 centimeter = 10 millimeters

2.8

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3

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Measuring Volume

Top Image: http://www.tea.state.tx.us/student.assessment/resources/online/2006/grade8/science/images/20graphicaa.gif�Bottom Image: http://morrisonlabs.com/meniscus.htm

We will be using graduated cylinders to find the volume of liquids and other objects.

Read the measurement based on the bottom of the meniscus or curve. When using a real cylinder, make sure you are eye-level with the level of the water.

What is the volume of water in the cylinder? _____mL

What causes the meniscus?

A concave meniscus occurs when the molecules of the liquid attract those of the container. The glass attracts the water on the sides.

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Measuring Liquid Volume

Images created at http://www.standards.dfes.gov.uk/primaryframework/downloads/SWF/measuring_cylinder.swf

What is the volume of water in each cylinder?

Pay attention to the scales for each cylinder.

52 ml

37 ml

23 ml

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Measuring Solid Volume

10 cm

9 cm

8 cm

We can measure the volume of regular object using the formula length x width x height.

_____ X _____ X _____ = _____

http://resources.edb.gov.hk/~s1sci/R_S1Science/sp/en/syllabus/unit14/new/testingmain1.htm

We can measure the volume of �irregular object using water displacement.

Amount of H2O with object = ______��About of H2O without object = ______��Difference = Volume = ______

10

8

9

720 cm3

200 ml

260 ml

60 ml

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Stop

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Bell Work

  • Remember to date your bell work
  • What are the four Spheres of Earth Science?
  • Give an example of each.
  • Convert the following:
    • 1500mg = ____ g
    • 120m = _____ km
    • 500ml = _____ L

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Density

  • Remember
      • Mass is the amount of matter in an object
      • Volume is the amount of space an object takes up

If both boxes have the same volume and all the balls have the same mass. Which has the greater DENSITY?

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(D=m/v).

The unit for density is : g/ml or g/cm3

Remember: 1ml = 1cm3

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Density

Which has a greater density a Styrofoam cup or ceramic cup

vs.

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Density

  • To find the density of an object
    • 1st find the mass (g)

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Density cont…

  • To find the density of an object
    • 2nd find the volume
      • If it is a liquid use a graduated cylinder read the bottom of the meniscus (ml)
      • If it is a regular shaped object – L x W x H (cm3)
      • If it is an irregular shaped object – Water Displacement (ml)

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Density cont…

  • D = mass / volume ( D=g/ml )
  • Divide the mass by the volume
    • grams / ml

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  • Example: mass = 6 g and volume = 2 ml

6 g / 2 ml = 3 g/ml

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Density cont….

  • 2nd find the volume cont….
    • If it is a regular shaped object (like a block of wood) use l*w*h

h

w

l

Measured in cm units cm x cm x cm = cm3

cm3 = ml

Thus cm3 is a unit of volume

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Density cont….�2nd find the volume cont….�

  • If the object is irregularly shaped use the Water Displacement method
    • Measure an amount of water in a graduated cylinder – record
    • Place object in cylinder (the water will raise) read the change – record
    • Subject the two – the difference is the volume of the object

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The density of water is 1.0 g/mL

  • If an object’s density is greater than 1.0 g/mL will it sink or float?

http://www.explorelearning.com/index.cfm?method=cResource.dspView&ResourceID=17

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Will a Diet Pepsi float or sink?

Regular Pepsi float or sink?

Form a hypothesis.

Write it down in your notes.

Let’s see what happens!

Were you correct in your predictions?

Why or why not?

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Stop

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Bell Work

  • Remember to date your bell work (this will be turned in with your packet at test time)
  • What are the four Branches of Earth Science?
  • Give an example of each.