Day 5
Intro to Engineering
Allen Sam
6-15-18
Activity 3.1a Linear Measurement SI

Record the length of the rectangles shown in the following figure using SI units and the correct number of significant figures. Include the units in your answers.
Distance
Measurement
1.
A
 0.4cm
2.
B
 1.9cm
3.
C
 3.75cm
4.
D
 6.25cm
5.
E
 7.3cm

Calculate each of the following lengths and record the answer using appropriate significant digits and the correct units. Show all calculations.

6.      What is the difference in the length of rectangles A and C?
3.75cm - 0.4cm=  3.35cm
7.      What is the difference in the length of rectangles B and E?
7.3-1.9=5.4cm



 


11.       What type of pictorial is shown in number 10? How can you tell?
The pictorial in number 10 is a one point view perspective sketch because it mainly focuses on the front view and barely shows three perspectives.

Conclusion
1.               Explain the meaning of significant digits (or significant figures) in measurement.
Significant figures are the number of digits in a measurement for a certain amount of accuracy. In engineering, many sig figs should be used to make measurements more accurate. 


2.               Why is the metric system used instead of the US customary system, and vice versa, in various parts of the world?
The metric system is used in most of the world because the units are easily converted by tens, but the U.S. uses a customary system for its uniqueness.

Activity 3.1b Linear Measurement US
Distance
Measurement (Fraction)
Measurement (Decimal)
1.
A
 1/4 inch
 .25 in
2.
B
 15/16 in
 .94 in
3.
C
 1 3/4 in
 1.8 in
4.
D
 2 13/32 in
 2.41 in
5.
E
 3 1/32 in
 3.03 in

6.      What is the difference in length between rectangles A and C?
 1.8-.25=1.55 in
7.      What is the difference in length between rectangles B and E?
 3.03-.94=2.09 in


10. Measure and record the length of additional items in your classroom using appropriate measurement units as directed by your instructor. Record fractional inches to the nearest 1/32” and decimal inches to the nearest hundredth of an inch.
Object
Description of measurement
Measurement units
Measurement
CD
Diameter
cm
4 11/16
Desk
Length 
Decimal inches
 34.25 in
 highlighter
                length
 decimal inches
 5.50 in
 20 dollar bill
                width
 fraction
 2 9/16 in
 lead case
 length
 decimal
 3.0 in

11. In your engineering notebook, create a full scale isometric view of the object represented in the following sketch using the dimensions shown. Use a ruler to obtain the correct dimensions on your sketch.


Conclusion
1.                  When you look at a drawing, how do you know if you are looking at U S Customary or SI measurements? Why is it important for an engineer to know this piece of information?
 You can tell if a sketch is using SI units or U.S customary units by looking at the units it uses. Engineers need to know both of these units because they need to get the actual length of an object right and not mess up a conversion.

Activity 3.2 Unit Conversion









Conclusion
1. Why would you have to know how to convert measurements when looking at a technical drawing?
You need to know how to convert measurements in order to communicate the measurements with someone else from another country
2. How can you use units help you solve a problem? 
Units can allow yo to understand (with your preferred unit) the measurements of an object.

Activity 3.2h Unit Conversion Homework



Activity 3.3a Making Linear Measurements






Conclusion
1.      What additional tools may have helped to measure these parts?
 Using a ruler helped generalize the distances of bigger measurements.


2.      Revisit number 1 above. Measure at least five of the dimensions of your part using a standard ruler and record the measurements in brackets next to each caliper measurement. Which measuring device (the caliper or the ruler) provides the best measurements?  Why?
The caliper overall is a better tool to measure the autoblox cars because they can directly measure the ends of the car and with more significant figures.




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