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8/26 Bellwork

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8/26 Bellwork 1. What is the independent variable in this data table? Amount of Time Distance Track Trials 8 sec 10m Classroom floor 1 12 sec 20m Classroom floor – PowerPoint PPT presentation

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Title: 8/26 Bellwork


1
8/26 Bellwork
Trials Track Distance Amount of Time
1 Classroom floor 10m 8 sec
2 Classroom floor 20m 12 sec
3 Classroom floor 30m 19 sec
4 Classroom floor 40m 26 sec
5 Classroom floor 50m 33 sec
1. What is the independent variable in this data
table?
2. What is the dependent variable in this data
table?
2
8/26/13
  • Measurement Tools

3
Length
  • Length- is the distance between two points.
  • We use a metric ruler to measure length.
  • The standard unit of length we use is the meter
    (m).

4
What is Volume?
  • Volume is the measure of the capacity of a
    container.
  • It is the measure of how much a container of a
    particular shape will hold - liquids, dry
    substances, etc.
  • Tool- graduated cylinder
  • Standard unit is Liter (L)

5
Measuring Mass
  • Mass is the amount of matter in an object
  • Matter is some thing that has mass and takes up
    space
  • Mass is measured in grams (g) and kilograms (kg)
  • 1 paper clip 1 gram
  • 1000g 1kg

6
Tools for measuring Mass
  • The triple beam balance

7
How to use a triple beam balance
  • 1) Make sure that the balance scale is at zero.
  • 2) Place object on balance and move the largest
    rider one notch at a time until the beam drops.
    (100s spot) Move the rider back one notch (make
    sure it locks in place)
  • 3) Move the next largest rider until the beam
    drops (10s spot). Back it up one notch.
  • 4) Move the smallest rider (1s spot) until the
    beam swings equally above and below the zero
    mark.
  • 5) Add up all the numbers to find the mass!

8
Calculate The Mass
9
Spring scale- a balance that measures weight by
the tension on a helical spring A spring scale is
used to measure force such as weight. Unit
Newtons
10
Mass Vs Weight
Weight depends on gravity Weight equals Mass X
gravity The weight of an object changes if the
pull of gravity changes
Mass does not depend on gravity The mass of an
object always remains the same
11
Temperature
We use a thermometer to measure temperature.
While we are use to measuring temperature in
Fahrenheit, the rest of the world uses Celsius.
Kelvin is another unit for temperature.
12
Density
  • The quantity of something per unit measure,
    especially per unit length, area, or volume.
  • Units grams per cubic centimeter or g/cm3
  • Formula densitymass/volume or dm/v

13
  1. Frank has a paper clip. It has a mass of 9g and a
    volume of 3cm3 . What is its density?
  2. Frank also has an eraser. It has a mass of 3g,
    and a volume of 1cm3 . What is its density?
  3. Jack has a rock. The rock has a mass of 6g and a
    volume of 3cm3 . What is the density of the
    rock?
  4. Jill has a gel pen. The gel pen has a mass of 8g
    and a volume of 2cm3 . What is the density of
    the rock?
  5. Alicia has a watch. It has a mass of 4g and a
    volume of 2cm3 . What is the density of the
    watch?
  6. Mia has a wallet. It has a mass of 15g and a
    volume of 5cm3 . What is the density of the
    wallet?
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