Question

module 3 - review worksheet
name:__ date:__
part a: multiple choice review

1. which material is a composite?

a) steel
b) plastic
c) carbon fiber
d) glass

1. which process involves pouring liquid into a mold?

a) machining
b) welding
c) casting
d) extrusion

1. which property measures a materials resistance to wear and pressure?

a) durability
b) conductivity
c) cost - effectiveness
d) corrosion
part b: matching review
match the term to its definition:

1. __ machining
2. __ welding
3. __ sustainability
4. __ alloy

a) joining metals together with heat
b) cutting away material to create shape
c) mixture of metals to improve properties
d) use of environmentally friendly materials
part c: short response
in 3 - 4 sentences, explain why engineers must balance cost, safety, and performance when choosing materials for a project. give one example.

Explanation:

1. Part A - Multiple - Choice:

• A composite is a material made from two or more constituent materials with different physical or chemical properties. Carbon fiber is often used in composites. Machining is cutting away material, welding joins metals with heat, casting involves pouring liquid into a mold, and extrusion forces material through a die. Durability measures resistance to wear and pressure.
• For the matching part, machining is cutting away material to create shape, welding is joining metals together with heat, sustainability is the use of environmentally - friendly materials, and an alloy is a mixture of metals to improve properties.
• In part C, cost affects the affordability of a project. Safety is crucial to protect users and workers, and performance ensures the project functions as intended. For example, in building a bridge, steel might be chosen as it is strong (good performance), relatively safe, and cost - effective compared to some high - end alloys.

Answer:

Part A

1. c) Carbon Fiber
2. c) Casting
3. a) Durability

Part B

1. b) Cutting away material to create shape
2. a) Joining metals together with heat
3. d) Use of environmentally friendly materials
4. c) Mixture of metals to improve properties

Part C

Engineers must balance cost, safety, and performance when choosing materials for a project. Cost determines the overall budget of the project. Safety is non - negotiable to prevent accidents and ensure user well - being. Performance ensures the product or structure functions as required. For example, in constructing a building, concrete is often chosen as it is cost - effective, has good structural safety, and provides reliable performance for load - bearing purposes.