October 22, 2012
Students will learn about
mass, length and volume.
The bowling ball and the balloon take up
the same amount of space ( have equal
volumes ) Do equal volumes of
different substances always have the
same mass? on
DO NOW
• 1. What tool is used to measure length?
• 2. What tool is used to measure mass?
• 3. What tool is used to measure
temperature?
Length
• Definition
• Distance between two points
Length
• Tool
• Ruler or meter stick
Length
• Label units
• Centimeter (cm)
Length
• Tips
• Line object up at zero mark
• Measure with decimals (no
fractions)
• Be accurate
• Label your answer
Example
• What is the length of
the object at left?
Example
• What is the length of the
object at left?
Example
• What is the length of
the object at left?
Mass
• Definition
• Amount of matter in an
object
Mass
• Tool
• Triple beam balance
Mass
• Label units
• Grams (g)
• Using a tbb
• 1. Zero the balance (all
masses left)
• Using a tbb
• 2. Move 100 g mass first- until
balance tips, then slide mass
one spot left
• Using a tbb
• 3. Move 10 g mass next until
balance tips, then slide mass
one spot left
• Using a tbb
• 4. Move 1 g mass last until
balance tips, then slide mass
one spot left
• Using a tbb
• 5. Add up all three masses to
find the total mass
Mass
• Tips
• Be accurate
• Use decimals, no fractions
• Label your answer correctly
Triple Beam
Balance
Used to Measure
Mass
Parts of the
Triple Beam Balance
PAN
ZERO/
TARE
KNOB
MOVEABLE
MASSES
BEAMS
BALANCE
POINT
BASE
A Closer Look at the Beams
10 gram
beam
100 gram
beam
1 gram
beam
Converting g to mg
1 g =1,000mg
(1 gram = 1,000 milligrams)
When changing grams to milligrams,
the decimal is moved 3 places to the
RIGHT
Example:
50.0 grams=50,000.0 milligrams
Practice reading the mass
on the Beams
1. If the middle beam is on 400g, the
back beam is on 50g and the front
beam is on 7g, what is the total mass
in grams? Mg? Kg?
2. If the middle beam is on 200g, the
back beam is on 20g and the front
beam is on 5.2g, what is the total
mass in grams? Mg? Kg?
3. If the middle beam is on 500g, the back beam is on
10g and the front beam is on 1.2g, what is the total
mass in grams? Mg? Kg?
Using a Triple Beam Balance
1. Wipe off the pan
Using a Triple Beam Balance
2. Move all of the weight to zero (the
far left)
Using a Triple Beam Balance
3. Adjust the tare knob ( or adjustment
knob) until the pointer lines up with the
zero mark
Tare knob
or adjustment knob
Using a Triple Beam Balance
4. Carefully place the object on the pan.
Leaving the weights at zero for now.
Using a Triple Beam Balance
5. Move the weight on the bars until the
pointer lines up with the zero mark.
*For large or heavy objects start with
the large weight that moves in 100 gram
increments
* For small and lighter objects start
with the smaller weights that move in 1
gram or 10 gram increments
Using a Triple Beam Balance
5.
Using a Triple Beam Balance
6. After finding which heaviest weight on the
100 gram bar still allows the pointer to
point above the zero mark, start adding
smaller amounts from the other bars. Do
this first with the weights on the 10 gram
bar then the one gram bar until the
pointer is lined up with the zero line
NOTE: The one gram bar is very sensitive.
Touch it very carefully and move the
weight slowly
Using a Triple Beam Balance
6A
Using a Triple Beam Balance
6B
REVIEW: Using a Triple
Beam Balance
1. Wipe off the pan
2. Move all of the weights to zero
3. Adjust the tare knob( also called the
adjustment knob) until the pointer
lines up with the zero mark
4. Carefully put the object on the pan
Using a Triple Beam Balance
5. Move the weight on the bars until the
pointer lines up with the zero mark.
*For large or heavy objects start with
the large weight that moves in 100
gram increments
* For small and lighter objects start
with the smaller weights that move in 1
gram or 10 gram increments
Using a Triple Beam Balance
6. After finding which heaviest weight on
the 100 gram bar still allows the pointer to
point above the zero mark, start adding
smaller amounts from the other bars. Do
this first with the weights on the 10 gram
bar then the one gram bar until the
pointer is lined up with the zero line
NOTE: The one gram bar is very sensitive.
Touch it very carefully and move the
weight slowly
Calculating the Volume of a
Regular Object
• Calculating the volume of a regular
object is easy.
• Just multiply Length X Width X
Height
Width
Length
Height
Calculating the Volume of a
Cubic Object
• For instance, if you have a cube
that is 4 centimeters long, 4
centimeters wide and 4
centimeters high you would
multiply 4cm X 4cm X 4cm = 64
cubic centimeters