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: Force on blocks

  1. Sep 27, 2007 #1
    Fig. 5-1a shows two blocks on a smooth surface. A constant horizontal force Fa is applied to block A, which pushes against block B with a 28.0 N force horizontally to the right. In Fig. 5-1b, the same force Fa is applied to block B so that block A pushes on block B with a 14.0 N force horizontally to the left. The blocks have a total mass of 30.0 kg.


    Fig. 5-1

    (a) What is the magnitude of the acceleration of the blocks in Fig. 5-1a?

    what i tried was F=ma so 28=30a so 28/30=a

    (b) What is the magnitude of the force Fa?
  2. jcsd
  3. Sep 27, 2007 #2

    Doc Al

    User Avatar

    Staff: Mentor

    28.0 N is the force on block B (in case a), not on both blocks. You have to use all the information given to solve this. Hint: The same force pushes the same total mass in each case.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook