Both federal child labor laws and Massachusetts state law concur that the minimum age to work is 14 (with some exceptions). But child labor laws in each state may vary regarding the minimum age to work and which permits are needed. When there is a conflict between federal and state laws, the strictest law will apply. Although 14 is the official age Massachusetts youth generally begin working, there are exceptions.
The moment of inertia, otherwise known as the angular mass or rotational inertia, of a rigid body is a tensor that determines the torque needed for a desired angular acceleration about a rotational axis.
A key phrase in golf club design is Moment of Inertia (MOI) and here is why it matters. MOI is a term used in physics to measure the stability of an object and how resistant it is to being twisted. The higher the MOI the more resistant an object is to being twisted. In golf it is effectively a measure of the forgiveness of the club at impact.