Final answer:
An impulse refers to a sudden stress with force delivered rapidly, while sustained stress describes force applied slowly. Both are measured as stress, indicated by the force per unit area.
Step-by-step explanation:
The question is asking to identify two types of stresses based on the speed of force application. Impulse refers to a sudden stress, that is force that is delivered powerfully and at high speed. Content loaded with describing an impulse refers to the impulsive effect of applying a force on a system for a time interval typically a short one. When discussing stress that is slow and consistent we're often referring to static or sustained stress, where the force is applied slowly over time.
Both impulse and sustained stress affect the momentum and deformation of an object based on the magnitude of force and the area over which it is applied. The amount of stress is quantified as force per unit area, measured in newtons per square meter (N/m²), and is a key concept in understanding how forces affect materials and structures.