So, my mathematics has failed me once again. I'm looking to work out the impact force of a hammer, while knowing the ram force, arm length and impact area size.

Ram Force (at full extension): 10,000N
Arm Length: 1 Meter
Impact Area Size: 1 cm x 1cm

In my mind, this should be crazy simple, but I think I have done it incorrectly, mainly because I don't know what difference the impact area size makes. (Plus, moment arms were a long, long time)

Could anyone explain it at a 5-year-old's level please?