# Force of a fist-punch have G's need help!

1. Aug 30, 2007

### jaywoo

I need to calculate the force of a punch for a test I'm running. I have the numbers, but it seems that I have to backwards to find my number!.

I have the force of a punch in G's given by a sensor (accelerometer)

I have Ft/s (feet per second) (high speed Camera) will have anyway by thisafternoon.

I have the mass (6lb moving "fist" on a pnumatic cylinder)

I need Ft/lbs of the punch.

Can anyone give me my formula?

Many Many thanks indeed!

2. Aug 30, 2007

### mgb_phys

Ft/lbs doesn't mean anything.
If you mean the force than F = mass 8 acceleration , you have that from the acceleromter. 1g = 9.8m/s^2 or 32ft/s^2.
Energy is force * distance, ft*lbs. Or you could get it from the kinetic energy of the fist.
Impulse is force*time.

3. Jun 24, 2009

### Newberrys

what was the Accelerometer data?

Im looking to get an Accelerometer (40g) and i want to know the spec's i need so that it wont break.

4. Jul 21, 2011

### AndyS

Hi
go to www.prosporttech.com[/URL] we use Herman Digital Trainers for martial Arts, American Football, Rugby and most other contact sports.

Check it out, it should give you every thing you need.

Andy

Last edited by a moderator: Apr 26, 2017