Mass of foot  = 3.18 kg

	Kick without Spin	Kick with Spin
Velocity (m/s)	25.83 m/s	36.38 m/s
Acceleration (m/s2)	10.496 m/s2	14.594 m/s
Force (N)	33.38 N	41.93 N
Momentum (kg x m/s)	82.13 kg x m/s	91.32 kg x m/s
Total Work( J)	66.76 J	91.10 J

Research links:

Ballistic pendulums are actually used to measure the speed of a bullet.  I don't know if it's useful, but if so, then look here:

http://hyperphysics.phy-astr.gsu.edu/Hbase/balpen.html

http://www.google.com/products?hl=en&client=firefox-a&channel=s&rls=org.mozilla:en-US:official&q=ballistic+pendulum&um=1&ie=UTF-8&sa=X&oi=product_result_group&resnum=4&ct=title


Or, we may want to find a "Force Gauge".  If only we could find an affordable one...: