Would the momentum of an object increase or decrease by adding mass to the block?  Why or Why not?

The momentum of an object would increase by adding mass to the block. Here's why:

1. Momentum is a vector quantity that depends on both the mass and the velocity of an object. It is calculated by the equation p=mv, where p is momentum, m is mass, and v is velocity.

2. If you increase the mass of an object while keeping the velocity constant, the momentum will increase. This is because you are increasing the 'm' in the equation p=mv, leading to a larger product and thus a larger momentum.

3. This is assuming that the velocity remains constant. If the velocity were to decrease as a result of the increased mass (for example, if the object is being propelled and the propulsion doesn't change), then the momentum may not increase.

4. However, in a closed system where no external forces are acting on the object, increasing the mass of the object will increase its momentum.

So, in conclusion, adding mass to the block will increase its momentum, assuming that its velocity remains constant.