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Measuring Mass, Weight and Density

Measuring Mass, Weight and Density. Measuring Mass. Mass is the measure of the amount of matter in an object. S.I. unit for mass is the kilogram (kg). Measured using a beam balance or an electronic balance. Guess My Mass!. 4 tonnes. 1 kg. 24 g. 4000 kg. 79 kg. Measuring Weight.

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Measuring Mass, Weight and Density

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  1. Measuring Mass, Weight and Density

  2. Measuring Mass • Mass is the measure of the amount of matter in an object. • S.I. unit for mass is the kilogram (kg). • Measured using a beam balance or an electronic balance.

  3. Guess My Mass! 4 tonnes 1 kg 24 g 4000 kg 79 kg

  4. Measuring Weight • The weight of an object is the gravitational force acting on the object by the Earth. • S.I. unit is the newton (N). • Measured using an extension spring balance.

  5. Think About This… • “My weight is 70 kg.”

  6. Calculate My Weight! • 100 g = ? N • 2 kg = ? N • 50 N = ? kg

  7. Mass versus Weight • The mass of an object changes as long as the amount of matter in an object remains the same. • The weight of an object changes with the gravitational pull that acts on it. Eg. : Since gravity on the moon < gravity on earth, a person weighs less on the moon than on earth.

  8. Who am I? My value is the same on the North Pole, the South pole and the equator. I remain the same on the equator My value is higher on the North Pole than the equator.

  9. Density • Density of substance is its mass per unit volume. • S.I. unit of density is kilogram per cubic metre (kg/m3) • Measured using a hydrometer.

  10. Density – Basic Calculation • Let’s say a ball is 2m3 in size. This would describe the volume. • After weighing on electronic scales, it appeared that its mass is 100kg. • The density will then be : mass/volume • = 100kg/2m3 = 50kg/m3 • Through conversion, {50x1000g/(100)3cm3}; it can also be described as 0.050g/cm3

  11. Applications of Density • Ships • Submarine

  12. Float or Sink? • In general substances with lower densities float in denser liquids or gases.

  13. Explain This!

  14. Egg in Saltwater

  15. Floating Orange

  16. Liquid Layers

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