Matter has Mass & Volume 9/9/08

Let’s Make Some Observations Write 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 Matter Matter- 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 Matter Mass- 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 Mass When measuring mass, you compare the mass of the object with the standard amount, or unit of mass. Standard Unit: Kilogram (kg) Large Grapefruit = ½ kg Smaller units are measured in grams (g) One penny= 2-3 g How many grams are in a kilogram?

Measuring Weight Gravity- a force that pulls two masses toward each other Weight- downward pull on an object due to gravity The more the downward pull= the more it weighs Measured by using a scale Standard Scientific Unit of Measure= Newton (N) Common Unit of Measure= Pound (lb)

Mass v. Weight Closely related, but not the same Mass describes amount of matter an object has Weight 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 occupies Volume- the amount of space that matter in an object occupies Basketball v. Bowling ball Two balloons

Determining Volume Formula Used when objects have a definite shape Rectangular: length X width X height V=lwh Volume= cm X cm X cm = cm 3 Other shapes have formulas too, and all are measured in cubic units

Displacement Irregular shaped objects Add water in a graduated cylinder, note the volume Submerge irregular object in water, the water is displaced (or moved upward), note the new volume Subtract 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 liquid How much space it takes up in a container Liters (L) or milliliters (mL) 1 mL= 1 cm 3

Key Concepts 1. 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?