Question

Often an unbalance of forces is produced in rotary or reciprocating machinery due to the ______

(a) Centripetal forces

(b) Centrifugal forces

(c) Friction forces

(d) Inertia forces

The question was posed to me in an online interview.

I'd like to ask this question from Balancing of Rotating Masses topic in portion Balancing of Rotating Masses of Machine Dynamics

Answer 1

Right answer is (d) Inertia forces

To explain I would say: Often an unbalance of forces is produced in rotary or reciprocating machinery due to the inertia forces associated with the moving masses.