Weight, mass and inertia are different things. The differences are explained below,
but unless you intend tuning bows on the moon, the distinction is not very important.
The main point to be aware of is that more mass makes things harder to move, and
not just because gravity pulls them towards the floor. They are harder to move sideways
Weight is the force gravity exerts on things. It always acts towards the ground.
Weight, and the way it is spread around a bow, is responsible for the bow’s balance
in the hand and the effort needed to hold the bow up.
Mass is the amount of material. Because (on Earth) weight is proportional to mass,it
is usually expressed as a weight (!).
The distinction is easier to see in films of astronauts in space they weigh less,
but have the same mass.
Since it’s the amount of mass that controls how hard you need to push something to
move it, mass is important when stabiliser effects are considered.
Inertia is how we describe the difficulty of moving an object. It’s another way of
thinking about the effect of weights. Isaac Newton’s view would be that, because
the mass is higher, the same force moves things less. Before Newton came along,
Inertia was a force that resisted movement. So we commonly use ‘high-inertia’ to
describe a stabiliser system that is hard to move quickly. That may not only be due
to the amount of mass; a very rigid system is harder to move a small distance than