Question(s) of the Day

• Answer the following questions on a piece of paper and put your name at the top. You have 8 minutes to complete the questions of the day. Good luck!

The photo opposite shows a handsaw, a tool often used to saw wood. The cutting part of this tool is made out

of steel, while the handle is made of acrylonitrile butadiene styrene (ABS).

a) Which category of material does the cutting part belong to?  

b) Since ABS can be remoulded when heated, which subcategory of plastics does this material belong to?

c) When the saw is used, the blade sometimes bends and then returns to its original shape. Which constraint is this part being subjected to and which mechanical property allows it to return to its original shape?

Answer a) Which category of material does the cutting part belong to?  

Answer: Metals and alloys

b) Since ABS can be remoulded when heated, which subcategory of plastics does this material belong to? Answer: Thermoplastics

 

Answer c) When the saw is used, the blade sometimes

bends and then returns to its original shape. Which constraint is this part being subjected to and which mechanical property allows it to return to its original shape?

Answer: The blade is undergoing deflection, and the mechanical property that allows it to return to its original shape is its elasticity

• Question of Day• Recuperation after school• Notes on Chapter 13 – Links• Web Exploration # I5 (FL) – Engineering• Food Web Film• What do you want to learn – sign up• Class Work

Ch. 12 – Manufacturing Technical Objects

Give your own definition for**Link**

And name and describe the 8 characteristics of links. Use a table to help you.

Characteristics of Links

Direct versus Indirect Links. What’s the difference?

A direct link only features the two parts being joined. An indirect link has a third part that helps link them together.

Classify as Direct or Indirect?

Link between tire and wheel link between blade & shoe

Direct Indirect (due to screw)

More Examples: Classify as direct or indirect.

c) The link between the two gears d) The link between the two gears

indirect direct

Rigid versus Flexible Links. What’s the difference?

• The rigid link cannot be bent. The flexible link is bendable like rubber.

Examples: Classify as rigid or flexible.

Link between tire and wheel link between blade and shoe

Flexible Rigid

More Examples: Classify as rigid or flexible.

c) The link between the two gears d) The link between the two papers

Flexible overall Flexible

Removable versus Nonremovable Links.

What’s the difference from the point of view of destruction?

The nonremovable link cannot be removed without wrecking what’s linked.

Examples: Classify as removable or nonremovable.

Link between tire and wheel link between blade and shoe

Removable Removable

Examples: Classify as removable or nonremovable.

Link between shoe top and sole link between nut and bolt

Non removable Removable

Complete Versus Partial Links. What’s the difference?

• A partial link allows one component to move without necessarily moving the other. A complete link has both parts moving together.

Classify as complete or partial links and explain why.

Complete Complete

Classify as complete or partial links and explain why.

Partial Partial

By now you should know what these are:1)Links2)8 Characteristics of Links3)Sign up for “What do you want to learn?”

Class Work

Read pages 435-441 of the textbookComplete p.225-226 of workbook (#57)