# shooting script by T2tqFs

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Slide 1                            Introduction                         Welcome!

Slide 2        Specific Gravity: Why Do Things Float?                   Welcome to the online pre-lab activity for
•Welcome to the online pre-lab activity for “Specific     “Specific Gravity: Why Do Things Float?”
class website.
instructions from our class website.

Slide 3                      Using This Website                         This website has several parts.
•Video Window                                             I will use sign language here in the video pane.
•English captions and audio                               English captions will scroll on the right. Audio
•PowerPoint slides                                        matches the captions.
• Video controls
PowerPoint slides arebelow and to the right.
Use the video controls to pause, play or jump
to the end of a video.

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Slide 4                         The Problem                            The Problem

Slide 5       What Happens When An Object Falls Into A                 What Happens When An Object Falls Into A
Liquid?                                    Liquid?
•Click on this link to watch a very short video.           Please pause this presentation.
• When the video is finished, come back to this window
and click “play.”
Click on this link to watch a very short video.

When the video is finished, come back to this
window and click “play.”

Slide 6    Two Identical Objects and Two Different Liquids In the first part of the video, there were two
•In the first part of the video, there were two identical
identical objects and two different liquids.
objects and two different liquids.
–One object sank, and one object floated.
– The objects are exactly the same; why did they behave      One object sank, and one object floated.
differently?
The objects are exactly the same; why did they
behave differently?

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Slide 7      Two Different Objects and Two Identical Liquids In the second part of the video, there were two
•In the second part of the video, there were two different
different objects and two identical liquids.
objects and two identical liquids.
–One object sank, and one object floated.
– The liquids are exactly the same; why did the objects behave   One object sank, and one object floated.
differently?
The liquids are exactly the same; why did the
objects behave differently?

Slide 8                        This Experiment                              You will investigate why objects sink or float in
• You will investigate why objects sink or float in this         this experiment.
experiment.

Slide 9                  Parts Of The Experiment                            The Parts of the Experiment.

This part of this presentation is to explore
some parts of the experiment.

Slide 10                 Parts Of The Experiment                            Every experiment has six parts. You know
•Every experiment has:                                         them from writing your lab reports.
–A Purpose
–Equipment
– A Procedure, or Method                                         We will discuss three of those parts in this
activity.

They are the purpose, the equipment and the
procedure.

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Slide 11                             Purpose                      Purpose

Slide 12              The Purpose Of This Experiment              All experiments in science have a purpose.
•All experiments have a purpose.                      The purpose of an experiment tells you why
instructions.
you are doing the experiment.
– Why are you doing this experiment?                   Experiments answer questions. What question
Read the purpose of this experiment from your
lab instructions.

Slide 13                           Equipment                      Equipment.
All experiments need equipment. You must
have all of your equipment assembled at the
start of the experiment.

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Slide 14                          Equipment                              Make sure that you understand the equipment
•Read your lab instructions. Find the list of equipment     you will use in the experiment before you come
that you will need.                                         to class.
• If you don’t know what some of these things are, find the   Read your instructions. Find the list of
“Equipment Vocabulary” link on the left.
equipment that you will use in this experiment.

Do you recognize all of these things?

If you don’t know what this equipment looks
like, click on “Equipment Vocabulary” on the
left.

Slide 15                         Procedures                              Procedures, or methods.

What actions will you do in this experiment?

Slide 16                      Getting Ready 1                            Choose a tray with:
three solid objects,
a vernier caliper.

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Slide 17                          Getting Ready 2                               Choose a tray with three labeled flasks of
• Choose a tray with three liquids.                                  liquids. The three liquids should all be different
from each other.

Slide 18                          Getting Ready 3                               Groups will share electronic mass scales. Use
• Choose an electronic mass scale. You will share with another lab   the scale that is closest to your place at the lab
group.
table.

Slide 19                            Solid Objects                               Solid Objects

Slide 20                   Measuring Your Objects                               Use the vernier caliper to measure the sizes of

Your goal here is to calculate the volume of
each object.

Write down the formula for the volume of each
shape.

Look at the formula to decide which
measurements you need.

Then, take the correct measurements for each
object.

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Slide 21        Finding The Masses Of Your Objects                    Use the scale to measure the mass of each
• Use the mass scale to measure the mass of each object.   object.

Look at the scale display before you put the
object on the scale.

If it does not read zero, push the button
labeled “Rezero,” “Tare” or “Zero.”

Then place the object on the scale.

Slide 22           Calculate The Volume Of Each Object.               You will use a formula to calculate the volume
•Rectangular prism                                       of each solid.
•Sphere
• Cylinder
The formula you choose depends on the
shape of the object.

The formulas on this slide are also in your lab
instructions.

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Slide 23            Calculate The Density Of Each Object                  Density is the mass of one unit of volume for
•Density is the mass of one unit of volume of a material.    any material.
• You know the mass of the object and you know the volume of
the object.
You know the mass of the object, and you
know the volume of the object.

Divide the mass by the volume.

Slide 24      Calculate The Specific Gravity Of Each Object               Specific Gravity is a ratio.
•Specific Gravity is a ratio of two densities.
• To calculate a ratio, you divide one number by another.
Divide the density of a material by the density
of water to get specific gravity.

Slide 25              Measuring The Volume of A Liquid                    You will measure the volume and the mass of
•You will measure the volume and mass of the liquids.        three liquids.
– Turn on the electronic mass scale.

First, turn on the mass scale.

Slide 26              Measuring The Volume of A Liquid                    Put the graduated cylinder on the scale.
 Place an empty graduated cylinder on the scale.

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Slide 27              Measuring The Volume of A Liquid                        Look for the button marked “Tare” or “ReZero.”
•Press the “Tare” or “Rezero” button.
• The scale should read zero even with the graduated cylinder on
it.                                                              Press the button.

This is a very important step.

The scale should read 0.0 g, even though the

If the scale does not say 0.0, press the
“Rezero” button until the scale reads zero.

Slide 28               Measuring Volume of Liquid                             Choose one of the liquids.
•Leave the graduated cylinder on the scale.
Choose one of the liquids.                                      Pour some into the cylinder.
 Pour some of it into the graduated cylinder.

It doesn’t matter exactly how much liquid you
pour in.

It’s good if the liquid comes up about halfway.

Slide 29               Measuring Volume of Liquid                             Leave the graduated cylinder on the scale.
• Read the volume of liquid from the markings on the graduated
cylinder.                                                        Read the volume of liquid from the markings
on the cylinder.

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Slide 30                 Measuring Volume of Liquid                                  Look at the curved surface of the liquid.
•The meniscus of a liquid surface is the lowest point on the surface.
•Always measure volume at the meniscus.
• Record this measurement. The units are milliliters, or cm 3.            Read the volume from the lowest point on the
surface.

Always read from the bottom of the meniscus.

Record this measurement. This is the volume
of the liquid.

The units are milliliters, or cm cubed.

You are finished measuring the volume of this
liquid. Now measure the mass.

Slide 31                   Measuring Mass of Liquid                                  Leave graduated cylinder on scale.
•Leave the graduated cylinder on the scale while you read the volume.
•Read the mass of the liquid in the cylinder from the scale.
• Record the mass of this liquid.                                         Read mass on scale.

Record the mass of this liquid. The unit is
grams.

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Slide 32                             What’s next?                         You have measured the volume and the mass
•Do not empty the graduated cylinder.                        of the first liquid.
• Repeat these steps for the other two liquids.                Don’t pour it out!

Select a new graduated cylinder, and repeat
this procedure with another liquid.

Do this with all three liquids.

Slide 33             Calculate The Density of Each Liquid                 Density is the mass of one unit of volume of a
•Density is the mass of one unit of volume of a substance.   substance.
• So, how do we calculate density?
• Divide the mass of the liquid by the volume of the liquid.
How do we calculate density?

Divide the mass of the liquid by the volume of
the liquid.

Slide 34       Calculate The Specific Gravity Of Each Liquid              Specific Gravity is a ratio of densities.
• Specific Gravity is a ratio of densities.
Divide the density of the liquid by the density of
water.

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Slide 35                   Action/Skill Vocabulary                      These vocabulary words show actions that you
will perform, or skills that you will develop
during this experiment.

Slide 36                           Select (verb)                        This is the sign for “select.”
•Choose
– John selected the red flower instead of the blue flower.   “Select” means to “choose” something from a
number of options.

Slide 37                         Measure (verb)                         This is the sign for “Measure.”
•To determine how much there is of an substance or an
object.                                                     “Measure” means to determine how much
–We measured the distance between the chairs.
– Before I run, I measure my weight.
there is of an substance or an object.

Measurements are expressed as numbers and
units.

For example, my measured height is 63
inches.

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Slide 38                       Calculate (verb)                             This is the sign for “calculate.”
• A mathematical process that we use to find number
quantities. Some properties of matter cannot be                A mathematical process that we use to find
measured. We have to calculate them, using                     number quantities. Some properties of matter
mathematics.
cannot be measured. We have to calculate
them, using mathematics.

Slide 39                        Turn on (verb)                              This is the sign for “turn on.”
• Click the switch on a piece of equipment. The switch
allows electricity to flow, and the equipment will operate.    Click the switch on a piece of equipment. The
switch allows electricity to flow, and the
equipment will operate.

Slide 40                          Place (verb)                              This is the sign for “place.”
• To put something down.

Slide 41                         Record (verb)                              This is the sign for “record.”
• You record your data by writing it down, or entering it into
a computer.                                                    “Record” means to write something down in an
organized way.

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Slide 42                                 Repeat (verb)                                           This is the sign for “repeat.”
•To do something again.
• To follow the same set of instructions over again.                                  Repeat means to do an action again.

Slide 43                                    Drop (verb)                                          This is the sign for “drop.”
• To allow an object to fall.
Drop means to allow an object to fall.

Slide 44                          Concept Vocabulary                                             This vocabulary is words related to concepts.

Slide 45                                Density (noun)                                           “Density” is fingerspelled.
•The mass of 1 cm3 or 1 m3 of a substance.
– Example: The density of copper is 8.9 g/cm3. That means that every 1 cm3 block of
copper in the world has a mass of 8.9 g.                                            Density is the mass of 1 cm3, or 1 m3, of a
substance.
To calculate density, divide the mass of an
object by the volume of the object.

Slide 46                            Dimensions (noun)                                            Dimensions are lengths that you measure on
•Length,                                                                            an object.
•Width,
•Height,                                                                            Some examples are length, width, height and
• Diameter.
diameter.

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Slide 47                               Mass (noun)                                         “Mass” is fingerspelled.
•Mass is a measure of how much “stuff” is in a sample of a
material. Everything is made of atoms and molecules. Mass is                  Mass tells you how much “stuff” there is in a
one way to measure the quantity of atoms and molecules in a
sample.                                                                       sample of a substance.
• For this experiment, we will measure mass in grams.
Everything has mass.

Slide 48                             Sample (noun)                                         A “sample” is a small piece of a material.
•A sample represents a group of things.
–“I want to buy a carpet. I went to the carpet store. The                     You can get information about the material by
salesman showed me samples.”
– “At the ice cream store, the seller gave me a sample of                       looking at the small piece.
chocolate chip ice cream to try.”

Slide 49                      Specific Gravity (noun)                                      Specific Gravity is a calculated ratio. It cannot
•Specific gravity is a ratio. You can’t measure it. You must calculate it.    be measured. It must be calculated.
• To calculate the specific gravity of a substance, divide its density by the
density of water. The density of water is 1.00 g/cm 3, or 1000 kg/m3.
Specific gravity is the ratio of the density of a
substance to the density of water.

Specific gravity is a number. It does not have
units.

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Slide 50                                Volume (noun)                           Volume is the amount of space an object takes
•The amount of space that an object takes up.                      up.
•Volume is measured in
–
cm3 (cubic centimeters)
–m3 (cubic meters)                                                 We measure volume in two units.
– ml (milliliters)

The top picture is of cubic centimeters. You
can see from the dime in the picture that they
are quite small.

The cube in the bottom picture is a cubic
meter. You can see from the size of the
people that the cubic meter is very large.

There are 1 000 000 cubic centimeters in a
cubic meter.

Slide 51                      Equipment Vocabulary                              This vocabulary is related to equipment.

Slide 52               Electronic Mass Scale (noun)                             The electronic mass scale is used to measure
• You will use a scale to measure the masses of the solid objects,   mass. Mass is related to weight. We will
and the masses of the liquids.                                     measure mass in grams.

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•You will use three graduated cylinders for this experiment.               volumes of liquid.
• A graduated cylinder is a measuring tool. You will use it to
measure liquid volumes.
They are called “cylinders” because they are
tall, narrow cylinders of glass.

They are called “graduated” because they are
marked off with lines to show the amount of
liquid in a cylinder.

Slide 54                             Liquids (noun)                                     Liquids are not solid, and they are not gasses.
•This experiment uses three liquids:
–Vegetable oil
–Corn syrup                                                                Liquids have mass, but no fixed shape.
–Isopropyl alcohol                                                         Liquids must be kept in some kind of container.
• Liquids do not have fixed shapes. They require a container.

Slide 55                              Solids (noun)                                     Solids
•This lab uses three solid objects.
– Solids have definite shape and volume. They are not liquid, and not gas.
Solids do not flow. They have mass and a
fixed shape. You do not need a container for a
solid object.

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Slide 56                            Tray (noun)                                Tray
• Your equipment will be in a tray. Take the entire tray to your
table.                                                            The tray will hold your lab equipment in one
place.

Slide 57                    Vernier Caliper (noun)                             Vernier Caliper
• A vernier caliper measures length with great precision. You can
measure hundreths of a centimeter with a vernier caliper.         A vernier caliper is used to measure lengths.

A vernier caliper is much more precise than a
ruler is.

You can measure to 1/10 of a centimeter with
a ruler.

You can measure to 1/100 of a centimeter with
a vernier caliper.

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