1. Not finding help here? Sign up for a free 30min 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!

Pulley acceleration Problem

  1. Jan 25, 2016 #1
    1. The problem statement, all variables and given/known data
    The masses of blocks A and B in the figure (Figure 1) are 20.0 kg and 10.0 kg, respectively. The blocks are initially at rest on the floor and are connected by a massless string passing over a massless and frictionless pulley. An upward force F⃗ is applied to the pulley.

    Find the acceleration b of block B when F is 294 N?

    2. Relevant equations
    F = ma

    3. The attempt at a solution
    Hyperphysics and Physics Clasroom Reading
    Looking at past problems I got right that were similar.

    Essentially, I get it right that the acceleration a of block A is equal to zero at that force and that at 124 N both blocks have acceleration 0, but doesn't that mean that the acceleration of block B is always zero since the it didn't accelerate at 124 N? That was a net force, so it should have caused acceleration yes?
     
  2. jcsd
  3. Jan 25, 2016 #2

    haruspex

    User Avatar
    Science Advisor
    Homework Helper
    Gold Member
    2016 Award

    It was the net force on what? That force acts on the pulley, but other forces act on the pulley.
    Where did the 124N come from, it's not in the problem statement as given.
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted



Similar Discussions: Pulley acceleration Problem
Loading...