[EIDXA] Physics question

Lew Gordon k4vx at hughes.net
Fri Jun 21 13:57:41 EDT 2013


>Ok.  I weigh about 200 pounds.  So if I'm hanging on the end of a rope, I'm
>putting about 200 pounds of force on that rope.  But what happens if I fall
>3 feet, and the rope stops my fall?  How much force did I just put on that

Jason,

Using basic physics I arrive at the following:
Force = mass X acceleration
Mass here on earth is defined as weight
In this case weight equals 200 pounds
Acceleration can be calculated by the following:
S = distance a body in free fall travels near the earth's surface
g = 32 ft/second/second (gravitional constant)
in this case S = 3 ft
t = time of fall in seconds
Thus from S = 1/2 g x t(squared)  we get t = sqrt( 3/16)
Solving for t we get t = 0.433 seconds

or

Force = 200 X 32'/sec/sec X 0.433
Force = 2771 pounds after a 3 foot fall.

Since I had basic high school physics 67 years ago I may be 
wrong.  Better check with someone else!

Lew, K4VX 



More information about the EIDXA mailing list