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!

Homework Help: Newton's Second Law for a Single Force

  1. Oct 30, 2009 #1
    1. The problem statement, all variables and given/known data
    Stopping a Salmon The tension at which a fishing line snaps is commonly called the line's "strength." What minimum strength is needed for a line that is to stop a salmon of weight 85 N in 11.6 cm if the fish is initially drifting at 3.0 m/s? Assume a constant acceleration.

    2. Relevant equations
    X1= -0
    X2= .116
    V1 = 3.0
    V2= 0
    A = unknown
    T = unknown
    T =
    3. The attempt at a solution
    Solved for A and found it to be -38.7931

    m = 85 / 9.8

    F = ma
    F= (8.673)(-38.793)
    F = - 336.45
    Not sure what i did wrong
  2. jcsd
  3. Oct 30, 2009 #2


    User Avatar
    Homework Helper

    Fishing line may not be in the direction of drift velocity of salmon.
  4. Oct 30, 2009 #3
    so that would swithch the sign to positive then
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook