Question

1. why might engineers prefer 3d printing for prototypes?

passage 3: safety and material selection
when engineers select materials, they must balance safety, cost, and performance. durability ensures a product can withstand wear and pressure without failing. cost - effectiveness means getting the best results for an affordable price. safety standards are rules that protect workers and consumers, such as using non - toxic plastics in medical devices. sustainability focuses on choosing materials that are less harmful to the environment, such as bamboo or hardwood. engineers must also prevent corrosion, the gradual destruction of metals by environmental conditions.

1. why are safety standards important in material selection?
2. which term means gradual destruction of metals?

a) durability b) corrosion c) sustainability d) alloy

1. give one example of a sustainable material and explain why it is sustainable.
2. short response:

write a paragraph (4 - 6 sentences) explaining why engineers must consider durability, cost - effectiveness, and safety when building something like a bridge or airplane. use evidence from the passage.

Explanation:

1. 3D printing allows for quick, cost - effective, and customizable prototypes, enabling engineers to test and refine designs easily.
2. Safety standards protect workers and consumers, ensure product reliability, and help in meeting legal requirements in material selection.
3. Corrosion is the gradual destruction of metals. It is a well - known term in materials science.
4. Bamboo is a sustainable material as it grows quickly, is renewable, and has a low environmental impact.
5. Engineers must consider durability to ensure the long - term functionality of structures like bridges and airplanes. Cost - effectiveness helps in making projects viable. Safety is crucial to protect lives. For example, materials with high durability can withstand wear and pressure, cost - effective materials make projects affordable, and safety - compliant materials prevent accidents.

Answer:

1. 3D printing allows for quick, cost - effective, and customizable prototypes.
2. They protect workers and consumers, ensure product reliability, and meet legal requirements.
3. b) Corrosion
4. Bamboo; it grows quickly, is renewable, and has low environmental impact.
5. Engineers must consider durability for long - term functionality, cost - effectiveness for project viability, and safety to protect lives. For example, durable materials withstand wear, cost - effective ones make projects affordable, and safety - compliant ones prevent accidents.