Presentation on theme: "The Properties of Matter"— Presentation transcript:
1 The Properties of Matter Chapter 1The Properties of Matter
2 WHAT IS MATTER? Everything Is Made of Matter Matter Has Volume matter = anything that has volume and massMatter Has Volumevolume = amount of space taken up (occupied) by an objectThings with volume cannot share the same space at the same time
3 Measuring the volume of liquids Liquid volumeMeasuring the volume of liquidsInstrument? Graduated cylinderliquid’s surface? meniscusWill a liquid in any container have a meniscus? Yes! In larger containers, the meniscus is too flat to see.Units? Milliliters (mL) or Liters (L)Solid volumeUnits : cubic units – m3 or cm3How do we get these units? Use three dimensions to calculate volume – length x width x height
4 Comparing solid & liquid volume Equal units? 1 mL = 1 cm3Can express vol of liquid in cubic units; however, vol of solids are never expressed in L or mLMeasuring the volume of gasesPossible? Yes… how?Gas expands to fill its containerSo if you know the volume of the container then you know the volume of the gas.
5 Matter Has Mass mass = amount of matter that something is made of ex: Earth vs. peanut vs. speck of dustIs a puppy like a bowling ball?An object’s mass can be changed only by changing amt. of matter in objectConsider… constant? growing?
6 The Difference Between Mass & Weight Weight is different from mass.Understanding the difference…gravity = force of attraction between objects that is due to their massesG. causes objects to exert pull on other objectsDoes all matter experience gravity? Yes! why or why not? b/c all matter has mass.Amount of attraction depends on: 1) masses of the objects and 2) distance between them
7 May the force be with you When is gravitational force experienced? By all objects in the universe, all the time.Gravitational force experienced by objects with small masses is very slight.Earth’s large mass & gravitational force is great when in conjunction with other large objects, like our atmosphere, the space shuttle, & planets
8 So what about weight? At a distance weight = measure of the gravitational force exerted on an objectobj & Earth have mass obj & Earth are attracted to each other force exerted on obj b/c of attraction to Earth weight of obj is measure of gravitational forceAt a distanceAttraction btwn obj decreases as distance btwn increasesTherefore gravitational force decreases, alsoMass doesn’t change, but weight does
9 Massive confusionMost obj’s weigh same anywhere on Earth b/c gravitational force is about same everywhere on earth. That’s why mass and weight are used interchangeably…Weight depends on mass but they aren’t the same!
10 Measuring Mass & Weight Weight is a measure of gravitational force, and must have units of force.basic SI unit : N_,_Newton_N approximately equal to 100 g masson Earth N = 100 gFigure 8
11 Mass Is a Measure of Inertia inertia = the tendency of all objs to resist any change in motion.B/c of inertia an object at rest will remain at rest until something causes it to move and obj in motion will move at same rate, in same direction until something acts to change its rate(speed) / direction
12 Why is mass a measure of inertia B/c obj with large mass is harder to start in motion & harder to stop than obj with smaller mass.ex:___________________________________________________________________________________________