In this section, we will learn how to override mass property values. To demonstrate this, we will override the mass of our model from 400 grams to 500 grams. To accomplish this, follow these steps: 

1. Open the Mass Properties command and click on Override Mass Properties..., as shown in the following screenshot:

2. Check the Override mass box and input the value 500, as shown in the following screenshot:

3. Click OK to implement the adjustment. 

This will redefine the mass as 500 grams. When viewing the mass properties, SOLIDWORKS will note the mass with the words user-overridden, as shown in the following screenshot: 

To change the mass back, we can go back to the Override Mass Properties command and uncheck the box for Override mass. If we do this, our mass will go back to 400 grams as a calculated value. In addition to overriding the mass, we can also override the values for the center of mass and moments of inertia. 

In practice, overriding mass properties is more common when we're working with assemblies rather than parts. We do this if we want to keep a certain effect of a part in its interaction with other parts in an assembly. This is especially the case if our parts are not fully refined yet. 

This concludes this section on assigning materials and evaluating mass properties. Being able to assign materials and evaluate mass properties for our model is essential in deciding what material we should use. Also, it plays an important role in calculating the cost of production, materials, transportation, and other applications that can relate to the evaluated mass properties.