Technician A says that two truck frame rails with exactly equal RBMs,can have very different dynamic performance.Technician B says that highway tractors are required to have much higher section modulus (SM) than dump trucks.Who is correct?

A) Technician A only
B) Technician B only
C) Both A and B
D) Neither A nor B

Section Modulus (SM)

In frame technology, the mathematical coding of the geometric shape of a frame member used to calculate resist bend moment. Each frame shape, for instance, radiused C-channel, has a section modulus formula from which you can calculate the SM by entering the actual dimension data used.

Dynamic Performance

Refers to the behavior or response of a system or device under varying operational conditions, especially under movements or loads that change over time.