Final answer:
The letter 'W' in a free-body diagram should be labeled as 'Weight' or 'W', representing the gravitational force acting on the object.
Step-by-step explanation:
The student is asking about the proper label for the weight force in a free-body diagram. The weight of an object is the gravitational force acting on it and is calculated as the product of its mass (m) and the acceleration due to gravity (g), given by the formula W = mg. In this scenario, a box has a weight of 220 N, which is the force due to gravity acting on it and should be labeled as 'W' or 'weight' on a free-body diagram.
The information given about the frictional force and the coefficient of static friction is used to determine the maximum force of static friction that could act on the box before it starts moving. However, since the actual question is about the correct label for the weight on the free-body diagram, the answer is simply that the letter 'W' in the free-body diagram should be replaced with the label 'Weight' or 'W'.