1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Velocity calculation in US system from acceleration

  1. Jan 12, 2015 #1
    I've been working exclusively in SI units up until now, so using the US System trips me up.

    Given force in pounds-force, I divide it by mass (units are pound-mass) to get acceleration. I take the integral of acceleration to get velocity, which, according to the US Units, are in mph. Am I reading this correctly?
  2. jcsd
  3. Jan 12, 2015 #2


    User Avatar
    Science Advisor

    If you divide pounds force by pounds mass to get acceleration you will get a result in g's. One g is approximately 32 feet/sec2. For example, 3 pounds force applied to 2 pounds mass will produce an acceleration of 1.5 g's = 48 feet/sec2.

    You can integrate acceleration in feet/sec2 over time to get a result in feet per second. Then the conversion from feet per second to miles per hour involves knowing that there are 5280 feet in a mile and 3600 seconds in an hour.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook