Presentation on theme: "Which weighs more, a pound of feathers, or a pound of bricks?"— Presentation transcript:
1Which weighs more, a pound of feathers, or a pound of bricks? Measuring MatterWhich weighs more,a pound of feathers, or a pound of bricks?
2Weight or Mass? Weight is a measure of the force of gravity on you Mass is measurement of how much matter is in an objectAn object’s weight changes from Earth to the moon or other planets, but the mass stays the same. REASON?Weight is a measure of the force of gravity on you, on the moon, gravity is much weaker.
3Measuring Mass Uses International System of Units (SI) kg = kilogram is a unit of massg = gram1000 g = 1 kgExamples:Nickel = 5 g baseball = 150 g glass of water =200g
4Measuring Volume Volume is…… the amount of space that matter occupies Regular objectsVolume = length x width x heightA rectangle has alength= 9 cmheight= 5 cmwidth= 4.2 cmThen, 9 x 5 x 4.2 =189 cm3 (cubic centimeters)WHL
5Measuring Volume Irregular Objects Use water displacement with a graduated cylinderOdd shaped objects like: ball, egg, rockSTEPS:Fill graduated cylinder with waterMeasure mL of water at the meniscus and write down amountPlace irregular object in graduated cylinderMeasure mL of water at the meniscus againFind the difference between the 2 water levels by subtractionRecord the answer in volume mL
6Other units of measurement Measuring liquidsliter (L)milliliter (mL)1000 mL = 1 LMeasuring Distanceskilometer (km)meter (m)centimeter (cm)millimeter (mm)10mm = 1 cm100cm = 1 m1000m = 1 km
7DensityDensity is the measurement of how much mass is contained in a given substanceDensity = mass divided by volumeThings that float on water are less dense than water. Less dense in water = floatThings that sink in water are more dense than water. More dense in water = sinkThings that neither float or sink, stay level, have the same density Same density = level