The value of the mass of an object measured in pounds mass (Ibm) is numerically
equal to its weight in pounds force (Ib/). However the student must remember to divide
the value of m in Ibm by gc when substituting into this form of Newton's equation. Thus
the Ibm will be divided either by 32.2 or by 386 when calculating the dynamic force. The
result will be the same as when the mass is expressed in either slugs or blobs in the F =
ma form of the equation. Remember that in round numbers at sea level on earth