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: Friction and Acceleration Help needed

  1. Mar 10, 2005 #1
    A Hockey puck of a mass 350g is sliding along the ice at 6.0 m/s[n] when it hits a rough patch of ice that exerts a frictional force of 0.42N

    i)Determine the pucks acceleration
    ii)determine how far the puck will slide before stopping.

    f=ma a=f/m a=.42/.35 this gives me 1.2 or something but it is slowing down therefore it should a negative, should I rewrite the equation giving aa negative value or is there a better equation for the information given.
     
    Last edited: Mar 10, 2005
  2. jcsd
  3. Mar 10, 2005 #2
    the 0.42 should have a negative attached to it since it acts opposite the direction of motion
     
  4. Mar 10, 2005 #3
    is the value still 0.42 though?
     
  5. Mar 10, 2005 #4
    I thought the mass was irrelevant?
     
  6. Mar 10, 2005 #5
    well F=ma is relavant to the unit im working on, however it also incorporates other units so I could be way off but im just dealing with what I have.
     
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook