1. What is a design plan? Grade 8 Science IB J.Kelly

2. Draw a pair of scissors
I’m sure most of you drew scissors that look something like this.... These are in fact scissors... But if I asked you to draw a design plan of scissors this drawing would be wrong.

3. The Design Plan
The design plan shows in a simplified way the elements that make up an object or device and explains how they work
In other words, your scissors drawing is way too artistic!!!

4. What to include in a design plan?
The parts represented in different colors
The name of the parts
The movement that each part does
The forces
Any guides or links
Indirect link: there is a linking component (glue, velcro, screw, staple, rivet, tape, nails) that holds two parts together
Direct link: two parts are held together WITHOUT a linking component

5. Other Design plan rules
Lines should be made with a ruler
2 parts that come together should be illustrated in 2 different colors
Respect proportions of the object but it doesn’t need to be made to scale or measure

6. Symbols for Force and Motion
Unidirectional translation
tension
Bidirectional translation
compression
Unidirectional rotation
torsion
Bidirectional rotation
shearing
Helical

7. Symbols for Links

8. Your Turn
On a separate piece of paper, attempt a design plan of a pair of scissors. When you are done, come up and show Ms.Kelly

9. Design plan for a pair of scissors

10. A Design Plan for a pair of scissors
Free in rotation and fixed in translation
Upper Blade F
Shearing
Paper F 10
Pivot F
Lower blade
Bidirectional rotation
The Components (parts)
Movements
Forces 10