1. PF Contest - Win "Conquering the Physics GRE" book! Click Here to Enter
    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!

Find centre of mass of a lamina.

  1. Jan 19, 2014 #1
    A lamina comprises a uniform rectangular card ABCD where AB = 10 cm and BC = 12 cm
    with a circle of radius 3 cm cut out. The centre of the circle is 7 cm from AB and 4 cm from AD.

    How would I find the centre of mass for this lamina? I know to find the centre of mass for a uniform lamina we can integrate or simple find the centre of the shape's diagonals. Also, how would I find it if the circle was added on top instead? I'm sorry I don't have much of an idea how to do these.
  2. jcsd
  3. Jan 19, 2014 #2


    User Avatar
    Staff Emeritus
    Science Advisor
    Homework Helper

    You can use the principle of moments to calculate the c.o.m. of the lamina.
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted