Measurement

Warm Up Locate your assigned seat on the seating chart Copy the learning targets and agenda for this week. If you have time…. Add your ideas to the graffiti wall prompt I’m proud to be a cardinal because….

Resume’ Sell your group to the class Some ideas to get you started – Special skills – Aerospace or other related experience/connections – Career goals – Unique characteristics – Strengths

Warm UP Compare and contrast Precision and Accuracy Use one or more diagrams to support your ideas

Measurement Lab MeterstickTable Length (m) Table Width (m) entirely taped partially taped not taped Data: Table 1: Table Length & Width Made With Various Metersticks

Measurement Lab Analysis Questions: 1.Which meter stick provided measurements that were the least precise? _______________ 2.the most precise? _______________ 3.Which meter stick provided measurements that were the least accurate? _______________ 4.the most accurate? _______________ 5.What made one meter stick more or less accurate than another?

Significant Figures Number of figures depends on the tool used Always read to the smallest increment and then estimate one more Read to nearest ¼ cup and then estimate #/8

Significant Figures Number of figures depends on the tool used Always read to the smallest increment and then estimate one more Read to nearest 1/8 th inch and then estimate #/16

Practice Metric ruler

Practice English Ruler

Warm Up Clear your desk for the lab safety quiz When you are finished take out your homework assignment and….. – Finish it OR – Check your answers OR – Get help if you need it!

Warm Up Copy the agenda and learning targets for the week Check your homework answers…. Turn in your homework to the turn in bin.

Significant Figures Number of figures depends on the tool used Always read to the smallest increment and then estimate one more Read to nearest 10 th gram and then estimate the 100 th

Practice with the TBB

Significant Figures in Calculations Your answer should NEVER have more decimal places than your measurements! Your answer should have the same number of decimal places as your least precise measurement Find the surface area of each cube Calculate the volume of each cube

Practice Calculate the surface area and volume of each sphere

Accuracy and Precision in Measurement Making accurate and precise measurements are very important in aerospace. You calculate the average value by summing all of the measurements and then dividing by the number of measurements Sum of all measurements # of measurements

Accuracy and Precision in Measurement You calculate the precision of measurements by dividing the range of repeated measurements in half Highest value – lowest value 2

Accuracy and Precision in Measurement You calculate the accuracy of measurements by calculating the error Actual Value – average measured value Actual value X 100

Practice Calculate the average Calculate the precision This measurement is ___________ +/- ______ If the actual value is 4.15, calculate the error

Warm UP Calculate the average Calculate the precision This measurement is ___________ +/- ______ If the actual value is 7.15, calculate the error

How to read calipers Calipers are used to make very precise measurements of 3-D objects

How to read calipers

Warm UP Copy the learning targets and agenda from the white board