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: Using hookes law to find impulse

  1. Dec 10, 2011 #1
    1. The problem statement, all variables and given/known data
    You are given a FORCE versus TIME graph, which shows oscillations with:

    A= 4N at the max points
    period is 4s
    spring constant (k)= 12.3 N/m
    mass of block exhibiting oscillation is 4.9 kg

    How do you find the IMPULSE delivered to the block during the 1st 2 seconds of oscillation?

    2. Relevant equations:
    x(t)= Acos(wt)
    W=deltaEk or F(D)

    3. The attempt at a solution


    I don't know how to connect this information
  2. jcsd
  3. Dec 10, 2011 #2


    User Avatar
    Homework Helper

    Welcome to PF, Captain!
    Do you have the graph? It depends where it starts - is F=0 at time zero or what?
    The usual impulse formula is F*Δt. Your F varies with time; can you integrate F*dt over the Δt?
  4. Dec 10, 2011 #3
    Find the function F that defines force (it is a sine or cosine, from what you told). Integrate it over the time interval from 0 to 2 seconds.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook