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: Two Sliders, work and energy

  1. Apr 21, 2009 #1
    1. The problem statement, all variables and given/known data

    Each of the sliders A and B has a mass of 2 kg and moves with negligible friction in its
    respective guide, with y being in the vertical direction (see Figure 3). A 20 N horizontal force
    is applied to the midpoint of the connecting link of negligible mass, and the assembly is
    released from rest with θ = 0°. Determine the velocity vA with which slider A strikes the
    horizontal guide when θ = 90°.
    [vA = 3.44 m/s]


    2. Relevant equations

    1/2 mv^2

    F = ma

    Wp = mgh


    3. The attempt at a solution

    When at 0 degrees


    At 90


    W = 20xd = 8J

    Work from cart A = 0.5mv^2

    Therefore 16 = mv^2

    v = 2 rt2


    do i need to add the energy from 20n force and from cart b...

    0.5mv^2 (b) + 8J = 0.5mv^2 (A)

    with F = ma, 20/10 a = 10 therefore v (b) = 2 rt 2

    sub this into above eq.

    8 + 8 = 0.5mv^2

    v = 4


    Iv been goin round in circles, clearly im wrong lol can someone explain how i could work this out please
  2. jcsd
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook

Can you offer guidance or do you also need help?
Draft saved Draft deleted