How is applied force defined?

Applied force is defined as the force that is exerted on an object when a person or another object interacts with it. This force can initiate motion, change the velocity of the object, or alter its shape. The concept of applied force is fundamental in physics and safety, as it helps to understand how different forces interact in a system.

In the context of safety and ergonomics, recognizing applied force is crucial for preventing injuries. For example, when lifting an object, the force exerted by the individual (the applied force) must be managed to avoid strain on the body. Understanding this concept further assists in designing workspaces and tools to minimize the risks associated with excessive applied forces.

The other options represent different types of forces: gravitational force acts on all objects due to gravity, spring force is related to the compression or extension of a spring, and frictional force opposes motion between surfaces. While all these forces are important in the study of mechanics, they do not define the specific interaction of a person or object applying force to another object, which is the essence of applied force.