Final answer:
Machines used in manufacturing are part of physical resources, essential in goods and services production, and considered as factors of production.
Step-by-step explanation:
The machines used during the manufacturing process are described as physical resources. These are one of many inputs in the production of goods and services, which also include labor, materials, and technology, collectively known as factors of production. Physical resources can vary from small tools to large machinery, and companies often have to decide on the most cost-efficient combination of physical capital and labor to optimize production.