Week 21 - Machines Help Us Do Work
Completion requirements
Week 21 - Machines Help Us Do Work
.
Lesson 2
Read pages 258 to 260 and 315 to 320
Lesson 2: Trial and Error
Scientists, engineers, and manufacturers of machines often rely on trial and error to construct devices or to fix errors. Typically, they try one thing, and if it doesn't work, they try something else. The development of rockets was no exception.
![]() |
![]() |