Hammer driving force

Larry Haun:

Newton's second law

v^2=u^2+2*a*s

And

F=ma

Assume the time of strike is same,

Direct proportion to 

-Hammer weight (mass)

-acceleration

-square of distance of strike.

Turkish woodworker Veysel Çelik:

Time:~1/4 sec

Travel:~50cm

Nail:50 mm

Hammer: 284g(10 oz)

Timber: 3x4cm 松木或樟木,(畫框木）

So the force is 11N

In Tennis serve:

So there's no "velocity hammer", but acceleration and how high you strike.

Higher/longer is the strike, the square of increase is your driving force.

And it doesn't matter which material ( titanium or steel) of hammer head is used

Hammer weight, choose one as long as you can handle, not strain to your waist and elbow. 

You should feel good in hand and good balance. Some heavy ones just too "head heavy".

Also the manufacturers offer heavy head with shorter handles, with good reasoning.

For me the max is ~16 oz

Reference:

Toppr