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: Forces question

  1. Dec 7, 2009 #1
    1. The problem statement, all variables and given/known data
    A block of mass 8.0kg starting from rest is pulled along a rough horizontal tabletop by a constant force of 2N it is found that the block moves a distance of 3.0m in 6 seconds
    a) what is the acceleration?
    b) What is the net force acting on the block?

    2. Relevant equations
    Fnet = Ma

    3. The attempt at a solution
    v = d/t
    v = 3/6
    v = 0.5m/s
    a = v/t
    a = 0.08m/s^2
    Fnet = 8 x 0.08
    = 0.64N [F]
  2. jcsd
  3. Dec 7, 2009 #2


    User Avatar
    Homework Helper

    You can't use v = d/t when the motion is accelerated.
    Use formulas with acceleration in them.
    d = Vi*t + .5*a*t² should work well.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook