Metric System Scientific Measurements

Reflection How do we measure? Explain and provide examples of how we measure various things in our lives.

Metric System Developed by the _______ in the late ________. Developed by the _______ in the late ________. Based on powers of ____, so it is very easy to use. Based on powers of ____, so it is very easy to use. Used by ______________________ in the world, with the exception of the ________. Used by ______________________ in the world, with the exception of the ________. Especially used by scientists. Especially used by scientists. Abbreviated SI, which is French for Systeme International. Abbreviated SI, which is French for Systeme International.

Metric Prefixes Regardless of the __________., the entire metric system uses the same __________. Regardless of the __________., the entire metric system uses the same __________. Common prefixes are: Common prefixes are: __________ = 1000 __________ = 1000 __________= 1/100 th __________= 1/100 th __________ = 1/1000 th __________ = 1/1000 th 1 meter = __________ centimeters= __________ millimeters

Length The SI base unit for length is the The SI base unit for length is the __________. __________. We use __________ or __________ sticks to find the length of objects. We use __________ or __________ sticks to find the length of objects.

Mass __________ is the amount of matter that makes up an object. __________ is the amount of matter that makes up an object. A golf ball and a ping pong ball are the same size, but the golf ball has a lot more matter in it. So the golf ball will have more mass. A golf ball and a ping pong ball are the same size, but the golf ball has a lot more matter in it. So the golf ball will have more mass. The SI unit for mass is the __________. The SI unit for mass is the __________. A paper clip has a mass of about one gram. A paper clip has a mass of about one gram.

Measuring Mass We will use a __________ __________ __________ scale to measure mass. We will use a __________ __________ __________ scale to measure mass. Gravity pulls equally on both sides of a balance scale, so you will get the same mass no matter what planet you are on. Gravity pulls equally on both sides of a balance scale, so you will get the same mass no matter what planet you are on.

Weight __________ is a measure of the force of gravity on an object. __________ is a measure of the force of gravity on an object. Your weight can change depending on the force of gravity. The gravity will change depending on the planet you are on. Your weight can change depending on the force of gravity. The gravity will change depending on the planet you are on. The SI unit for weight is the __________ (N). The SI unit for weight is the __________ (N). The English unit for weight is the __________. The English unit for weight is the __________.

Weight and Mass JillEarth 1 gravity Moon 1/6 th gravity Jupiter 2.5 gravities On orbit 0 gravity mass30kg30kg30kg30kg weight300N50N750N 0 Newtons Notice that Jill’s mass never changes.

Volume __________ is the amount of space contained in an object. __________ is the amount of space contained in an object. We can find the volume of box shapes by the formula We can find the volume of box shapes by the formula Volume = __________ x __________ x __________ In this case the units would be __________ _________ __ In this case the units would be __________ _________ __ So a box 2 cm x 3 cm x 5cm would have a volume of So a box 2 cm x 3 cm x 5cm would have a volume of__________

Base Units The base unit for volume The base unit for volume is the __________. We measure volume with a We measure volume with a _________________________________.

Graduated Cylinders Liquids form curved, upper surfaces when poured into graduated cylinders Liquids form curved, upper surfaces when poured into graduated cylinders To correctly read the volume, read the bottom of the curve called the: To correctly read the volume, read the bottom of the curve called the:__________________

Liquid Volume When the metric system was created, they decided that When the metric system was created, they decided that __________ of water would equal __________ of water and the 1 mL of water will have a mass of __________ __________ water = __________ of water= __________

Water Displacement We can use __________ We can use __________ __________ to find the volume of objects that are not boxed shaped. We can put water in a graduated cylinder. If a rock causes the level to rise from 7 to 9 ml, the rock must have a volume of We can put water in a graduated cylinder. If a rock causes the level to rise from 7 to 9 ml, the rock must have a volume of __________.

Water Mass and Volume __________ water = __________ of water = __________ __________ water = __________ of water = __________ So what would be the mass of 50 mL of water be?__________ So what would be the mass of 50 mL of water be?__________ So what would be the mass of 1 liter of water be? So what would be the mass of 1 liter of water be? 1 L = __________ so its mass would be 1000 grams or a kilogram. 1 L = __________ so its mass would be 1000 grams or a kilogram.

Density Density is the amount of matter (__________ ) compared to Density is the amount of matter (__________ ) compared to the amount of space (__________ ) the object occupies. We will measure mass in __________ and volume in We will measure mass in __________ and volume in __________ or __________

Density Formula Density is __________ divided by __________. Density is __________ divided by __________. Density = __________ / __________ Density = __________ / __________ Remember, all fractions are division problems. Remember, all fractions are division problems. Since the unit for mass is grams, and the unit for volume is ml or Since the unit for mass is grams, and the unit for volume is ml or cm 3, then the unit for density is __________, or __________ cm 3, then the unit for density is __________, or __________

Density Problem 1 Mass = 12 grams cm 3Volume = 6 cm 3 __________Density = __________ __________ In English we say the density of the object is __________ grams in every cubic centimeter.

Floating and Sinking __________ __________ materials will __________ __________ materials will __________ on top of more dense materials. Objects with a density of less than Objects with a density of less than __________ will __________ on top of water. Objects with a density greater than Objects with a density greater than __________ will __________ in water.

Objects that Sink! Objects with a density __________ than Objects with a density __________ than 1 g/mL will __________ in water.

Comparing Densities Where is the most dense object?Where is the most dense object? ___________________ __________ _________ Where is the least dense object?Where is the least dense object? ___________________ __________ _________

Density Review We don’t actually count g’s to find the mass of objects. How would you find the mass of a rock? We don’t actually count g’s to find the mass of objects. How would you find the mass of a rock? ______________________________________ __________ ___________________ _________ In real life, how would you find the volume of a rock? In real life, how would you find the volume of a rock? Use a ___________________ and see how much water the rock Use a __________ _________ and see how much water the rock ___________________ __________ _________