1. U3b-L6
November 6, 2009
Write each question and use notes from day 3 lesson 3.
When testing an idea, what is the only way to if your design will work in real-world conditions?
2. During the evaluation step of the design process, what do you do if your initial design doesn’t fully solve the problem or meet the challenge?
1. build a model or prototype and test it.
2. go back and repeat the problem solving steps, you’ll know
what doesn’t work and be in a better position to develop an
idea that does.

2. U3b-L6
Mousetrap Car
A mousetrap makes use of a simple machine called a lever. There are three different classes of levers. A first-class lever is like a see-saw at the park. The pivot point (bar in the middle) is called the fulcrum, the person being lifted is the load, and the person on the other end is the effort force.

3. Mousetrap Car A lever makes doing work easier. You can lift someone
U3b-L6
Mousetrap Car
A lever makes doing work easier. You can lift someone
with a see-saw much easier than if you tried to pick them
up! Second- and third-class levers have different
arrangements of the components of a lever. The fulcrum,
or pivot point, is at one end, instead of in the middle.
In a second-class lever the effort force is at the other
end, with the load in the middle. In a third-class lever,
the load is at the end and the effort is between the
fulcrum and the load.

4. U3b-L6
Mousetrap Car
                             
When you set the mousetrap, you are using a second-class lever. The load is the arm of the spring that is being pushed down to compress the spring. The effort force is your fingers on the end of the snapper arm, and the fulcrum is the pivot point in the middle of the trap. When the mousetrap is released, however, it acts as a third-class lever. The snapper arm becomes the load, and the spring arm becomes the effort force moving the load.

5. U3b-L6
Mousetrap Car
When a mousetrap is set, the spring in the center is compressed, becoming a source full of potential energy. This energy is being stored, not used, but as soon as the trap is released, it is converted to kinetic energy (the energy of motion) that propels the snapper arm forward.
                                   

6. Mousetrap Car Physics Concepts
U3b-L6
Mousetrap Car Physics Concepts
If you are trying to build a long distance traveling or fast vehicle you will need to think carefully about the following concepts: Energy, Power Output, Inertia, rotational inertia, friction, torque, and pulling force.

7. U3b-L6
Design Process Review
-By Now You Should Have Completed Some of “Mousetrap car” Project Design Process Steps Let’s Review Step 7.

8. Step 7 – Develop Design Proposal
U3b-L4
Step 7 – Develop Design Proposal
An explanation of your final design
Detailed drafted drawings
Steps to make it
Explanation of how it satisfies all criteria and constraints
Outcome: Sentences, Lists, Charts, Sketches

9. U1-L15
PREPARATION FOR STEP 7
Although you will be making a border for your detailed drafted drawing today, you may go back and finish any step that has not been completed after making the border today.
The step you want to make sure you have completed before you begin your actual detailed drafted drawing is the brainstorming detailed sketches step. You are supposed to select from one of them to make your detailed drafted drawing.

10. QUIETLY Get the following drafting tools: T-Square
U1-L15
PREPARATION FOR STEP 7
TALKING will result in 5 points loss each time. Draw Your Border as Each Upcoming Slide Will Review Steps For Making a Border.
REMEMBER FOCUS NO TALKING!
QUIETLY Get the following drafting tools:
T-Square
45 and Triangles
~5” of tape
Clear everything else off your drawing space except for the work

11. U1-L15
STEP-1 Square paper down using to using T-Square and lettering guidelines 2
Attach 3 1

12. DOUBLE-CHECK FOR SQUARE
U1-L15 5
DOUBLE-CHECK FOR SQUARE 6

13. U1-L15
STEP 2 – Lay Out Border
Measure ½” from all 4 edges of your paper. Then draw LIGHT const. lines.
[Intersections can criss-cross – as long as construction lines are LIGHT] ½” ½” ½” ½”

14. U1-L15
STEP 3 – Darken Border
Darken border lines with a heavy line. Begin and end precisely at intersections. ½” ½” ½” ½”

15. U3b-L6
HOMEWORK
-Finish Hybrid Vehicles Assignment. -Complete steps 1-9 of the “Mousetrap car” project. Follow the rubric to ensure a high score. -Study for TEST Friday 13, NOV.