Welcome to Class Compare and contrast theories and laws

Agenda Quiz Measurement notes – Measurement lab

Accuracy & Precision Accuracy: – Freedom form mistakes or errors; Correctness Precision: – The ability to repeat; Repeatability

Units of Measurement International System of Units (SI) Makes sharing data and results easier ********

Linear Measurement (straight lines) Length, Width, Height Definition: Distance between two points Tool: Meter stick, ruler Base unit of measurement: Meters (m)

Area Definition: – How much surface an object covers, 2-D Units of measurement: – m 2, cm 2, etc. Formula: – A = L x W

Volume Definition: – How much space an object takes up Two types of volume: – Regular and irregular Regular solids are box like – Volume is found by measuring length, width and height The volume of irregular objects is found by water displacement

Volume (cont.) Tool: – Regular = ruler or meter stick – Irregular = graduated cylinder Units of measurement: – m 3, cm 3 (for solids) – L, ml (for liquids) Formula: – V = L x W x H 1cm 3 = 1ml

Welcome to Class Define Accuracy and Precision

Agenda Finish Volume notes Lab

Volume Definition: – How much space an object takes up Two types of volume: – Regular and irregular Regular solids are box like – Volume is found by measuring length, width and height The volume of irregular objects is found by water displacement

Volume (cont.) Tool: – Regular = ruler or meter stick – Irregular = graduated cylinder Units of measurement: – m 3, cm 3 (for solids) – L, ml (for liquids) Formula: – V = L x W x H 1cm 3 = 1ml

Volume Lab

Welcome to Class How do you read a graduated cylinder?

Agenda Review measuring Volume of regular objects lab

Volume Definition: – How much space an object takes up Regular solids are box like – Volume is found by measuring length, width and height Formula: – V = L x W x H

Volume of other Regular Objects Spheres – Formula : V = 4/3 πr 3 Cylinder – Formula: V = πr 2 h *π = 3.14 Formulas are on Page 830 in the book

Measuring spheres/circles Measure end to end – Use paper on edge of spheres Measured diameter we need radius – Radius = ½ diameter – So: if d = 10 then r = 5

Volume of Regular Objects Lab

Welcome to Class What is the formula we use for a sphere? Cylinder?

Agenda Finish measuring volume of regular objects Mass notes Mass Lab

Mass Definition: – The amount of matter in an object Tool: – Triple beam Balance Base unit: – Grams (g) – A penny has the mass of about 1g 1g = 1cm 3 for water only

Making a connection When you use water (and this works only for water) 1 ml = 1 cm 3 = 1 g

Weight Definition: – The gravitational pull on an object Tool: – Scale Base unit: – Newton (N)

Mass Vs. Weight

Temperature Definition: –M–Measurement of the average kinetic energy of molecules Tool: –T–Thermometer Base unit: –C–Celsius (c o ) and Kelvin (k o )

Mass Lab

Welcome to Class List the common tools for measurement that we use to find linear measurements, volume and mass.

Agenda Finish mass lab Practice measuring QUIZ TOMORROW!