25. Which units would be the most appropriate to use to measure the degree of attraction between two objects due to their mass?

The attraction between two objects is force.

As such, if you don't describe the degree of attraction

in units of force, you're doomed.

Whether to use micronewtons, millinewtons, newtons,

giganewtons, ounces, pounds, or tons, really depends on

the size of the force, which in turn depends on the masses

of the two objects and the distance between them. You'll

want to select the unit that produces the most convenient

number. And of course, you'll want to favor the SI units.