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: Basic Motion question

  1. Jan 20, 2010 #1
    16. A block of dry ice weighing 1960 N is lying on a walkway. The coeffi cient of friction of
    the walking surface is 0.125. With what force must you push or pull the block to move it?
    A. 1.57 x 104 N
    B. 1960 N
    C. 245 N
    D. 6.38 x 10-5 N
    (For this I multiplyed 1960N (which is the Fn or fg) by the coefficient of friction on the walking surface which is 0.125)
    Is this correct?
     
  2. jcsd
  3. Jan 20, 2010 #2

    CompuChip

    User Avatar
    Science Advisor
    Homework Helper

    The answer is correct.
    The force [question: should you take gravitational or normal force here? e.g. on an inclined surface, these are not equal] multiplied by coefficient of friction gives the maximal frictional force. To get the block moving, you should exert at least this force [question: which physical law tells you that?].
     
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook