mass, volume, weight and density

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  • Great slies. I noted that you use "G" for gravitational acceleration. I think it is better to use "g" instead as convention. Cheers
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mass, volume, weight and density

  1. 1. Volume, Mass, Weight A short review!
  2. 2. Mass: The amount of matter an object has. Matter: Anything that has mass and takes up space (liquid, gas, solid).
  3. 3. Mass <ul><li>Units: Kilograms (kg) or grams (g). </li></ul><ul><li>Mass is generally measured in science type places using a a triple beam balance! </li></ul><ul><li>Mass is constant and only changes with diets and such. </li></ul>
  4. 4. More on Mass <ul><li>Make sure you “zero the balance”! </li></ul><ul><li>What is the mass of the object on the balance? </li></ul><ul><li>Start with the biggest weight and work toward the smallest. </li></ul>Start here
  5. 5. Weight: The pull of gravity on an object. Remember…gravity changes throughout our solar system
  6. 6. Heavy, Dude <ul><li>Gravity acts on mass! </li></ul><ul><li>W = m * G </li></ul><ul><li>Weight = mass * gravity </li></ul><ul><li>The force by which a planet or other such body tends to draw objects toward its center. </li></ul>
  7. 7. Volume: The amount of space an object takes up or contains.
  8. 8. Volume of Liquids <ul><li>Commonly measured in Liters (L) or Milliliters (mL). </li></ul><ul><li>Measured using a graduated cylinder. </li></ul><ul><li>Remember …get eye level and measure from the bottom of the meniscus. </li></ul>
  9. 9. Volume of Solids <ul><li>Commonly measured in meters cubed (m 3 ) or centimeters cubed (cm 3 ). </li></ul><ul><li>Measured by L*W*H (cm 3 ). </li></ul><ul><li>Irregular solids can be measured in graduated cylinder. </li></ul>
  10. 10. Helpful Hints… <ul><li>mL = cm 3 </li></ul><ul><li>So, if a solid displaces 2 mL of water in a graduated cylinder then its volume is 2 cm 3 . </li></ul><ul><li>Measure on the Metric side of the ruler! </li></ul>
  11. 11. new day = new ideas
  12. 12. Observe the four bottles and their contents. <ul><li>What is the same about each bottle? </li></ul><ul><li>What is different about each bottle? </li></ul><ul><li>What do you observe about their volume? </li></ul><ul><li>What do you observe about their mass? </li></ul><ul><li>Put bottles in order from the most dense to the least dense. </li></ul>
  13. 13. #3 (rocks) #1 (water) #4 (cotton) #2 (air) THE MOST DENSE THE LEAST DENSE
  14. 14. What is the density of your fridge?
  15. 15. Density=Mass/Volume
  16. 16. Where are there the most people? Where is the population most dense?
  17. 17. What is density? <ul><li>Definition: </li></ul><ul><li>the mass of a substance per unit volume </li></ul><ul><li>how many particles there are in a certain amount of space. </li></ul><ul><li>Units: g/ cm 3 (the amount of mass in a unit of space) </li></ul><ul><li>How to Measure: Find Mass, Find Volume, Divide M/V, Units. </li></ul>
  18. 18. Density! <ul><li>Mass of cotton bottle (103g) </li></ul><ul><li>Volume of cotton bottle (2L or 2000mL) </li></ul><ul><li>mL = cm 3 (2000 cm 3 ) </li></ul><ul><li>Density = 103g/2000 cm 3 </li></ul><ul><li>Density = 0.05 g/ cm 3 </li></ul>
  19. 19. FLOATING ROCK SINKING ROCK

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