Matter has Mass & Volume9/9/08

Let’s Make Some ObservationsWrite down as many observations about these two

balls without touching them.

• Now let’s touch and write down some more observations

• How would our observations be different if the larger ball was made of foam?

I. All Objects are Made of MatterMatter- anything that has mass and takes up space.

Your body; sparkling crystals; the air; water

Matter is made of particles called atoms, which are too small to be seen

What isn’t matter then? Light & Sound

Mass is a Measure of the Amount of MatterMass- a measure of how much matter an object

contains.A metal tablespoon has more matter than a plastic

tablespoon. So, which has more mass?

Measuring MassWhen measuring mass, you compare the mass of the

object with the standard amount, or unit of mass.Standard Unit: Kilogram (kg)

Large Grapefruit = ½ kgSmaller units are measured in grams (g)

One penny= 2-3 gHow many grams are in a kilogram?

Measuring WeightGravity- a force that pulls two masses toward each

otherWeight- downward pull on an object due to gravity

The more the downward pull= the more it weighsMeasured by using a scaleStandard Scientific Unit of Measure= Newton (N)Common Unit of Measure= Pound (lb)

Mass v. WeightClosely related, but not the sameMass describes amount of matter an object hasWeight describes how strongly gravity is pulling on that

matter

Earth v. Moon- Do we weigh the same?

Volume is a measure of the space matter occupiesVolume- the amount of space that matter in an

object occupiesBasketball v. Bowling ballTwo balloons

Determining VolumeFormula

Used when objects have a definite shapeRectangular: length X width X height

V=lwh Volume= cm X cm X cm = cm3

Other shapes have formulas too, and all are measured in cubic units

DisplacementIrregular shaped objectsAdd water in a graduated cylinder, note the volumeSubmerge irregular object in water, the water is displaced

(or moved upward), note the new volumeSubtract the volume of the water w/o the object from the

volume of the water w/ the object to get the volume of your object

Volume of a liquidHow much space it takes up in a containerLiters (L) or milliliters (mL)1 mL= 1 cm3

Key Concepts1. Give three examples of matter.2. What do weight and mass measure?3. How can you measure the volume of an object that has

an irregular shape?