Unit IV Review

5.  a, b, c, d

6. c

7.  a,b,c, d

8. d

9.c

10.a, d

11. a

12.  depends on how you define the system.  the horse and cart are balance, as the horse does not get ahead of the cart so far that it eomes unattached.  But the NET force of the horse and cart are unbalanced, so I would probably answer with the NET force, which is a

13.  For the same reasons as 12, I would a

14-17.

Reflection on Bridge Building

1. How much did your bridge hold?
2. How much did it cost, and how did you minimize your costs?
3. What is the mass of your bridge?
4. Calculate the force weight of the bridge, and the force weight of the load applied.
   
5. Using the member data sheet, which bridge member held the greatest load? How do you know?
6. Can a member experience both compression and tension? Explain.
7. IS your bridge model a good fit for the bridge you made in the program? Why or why not?
8. Draw a force diagram for your bridge when the truck is on the left-hand side of the structure.
9. How does friction matter in this project?
   
10. What have you learned in this project about statics, force diagrams, angles, and vectors.

This entire sheet should be about 1 page long, hand-written or typed, and due on Tuesday.

Build Your Own Bridge

Today, you will be building a static bridge using the West Point Bridge Designer  .  This is designed to test your knowledge of force vectors.

Build your bridge using the software, and send me the .bdc file at marciarpowellATgmail.com .  You will need to print a copy of the bridge design AND a copy of the truss information.  If you do not do this, you will need to redo your bridge.

After your bridge design is completed, you will build a model using manila folder for truss holders, popsicle sticks, and glue gun glue.  You also may use two pieces of corrugated cardboard that are no bigger than 3" x 12" each.  Designs must be completed in class, and the members of the bridge must be appropriately scaled.

You will get points for a) the most cost-efficient bridge b) the amount of mass your bridge can hold and c) a writeup on the project.  This is the benchmark for the statics portion of the class.  Expect a test next Tuesday.

Free Body Diagrams

Free Body Tutorial #1

Free Body Tutorial #2

A Dream Vacation: Courtesy of Vectors and Google Earth

You are headed on a dream vacation! Start at Manchester, and zoom around the globe using Google Earth in the North Lab. As you travel (on at least 10 stops), keep track of the latitude and longitude for each place, and create a scrapbook of activities and interesting highlights (You can print photos, and please write down 2 or 3 observations for each place. Ask other classmates who scrapbook for ideas...

Note the length and the angle of each leg of your trip. If you get done with this, you may start on the Day 2 activities.. Text or tweet me with questions.





REFLECTION QUESTIONS

• When you are finished, determine the net displacement from Manchester to your last location. Include a vector heading.
• Hand in your mercator projection graph, as well as the product detailing your trip, by the end of the day on Friday.

• Reflection questions that must be answered INDIVIDUALLY on the back of one of the graph sheets.
  

a) Would Google Earth or the graph be better for pilots?
b) which type of graph type would be better for detailing component vectors? Break ONE vector on that graph into its components. Show this on your reflection sheet,and indicate the starting and finishing locations.
c) based on the graph, could we easily determine a scale where 1cm = _____ miles. Why or why not?
d) how does a GPS use vector determinations as it calculates location?
e) Give three examples where a vector must be exact to the nearest mm.
f) Give three examples where a vector must be exact to the nearest m.
g) Give three examples where a vector must be exact to the nearest km.
h) Given what you have learned about vectors, where in your future career would you use vectors? Explain in 2-3 sentences.