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: Forces on a falling Object

  1. Oct 23, 2011 #1
    1. The problem statement, all variables and given/known data
    The height of which it will be dropped 5.1816m, then the mass is 0.057kg. and the gravity is 9.8m/s^2 .What is the force downward? whats the net force and whats the up force? and whats the time to hit the ground?


    2. Relevant equations
    Fg=m*g


    3. The attempt at a solution
    Fg=.057kg*9.8=.5586 N
    thats all i know how to do thanks
     
  2. jcsd
  3. Oct 23, 2011 #2

    PeterO

    User Avatar
    Homework Helper

    The only other thing that may be significant is are resistance once the mass starts falling. If the mass is a lead pellet, air resistance won't have much significance. If the pass is a huge block of polystyrene, air resistance will be significant.
    The only thing you know for sure is that air resistance on a falling object is directed up.
     
  4. Oct 23, 2011 #3
    its an egg , but how do u fund the other forces
     
  5. Oct 24, 2011 #4

    PeterO

    User Avatar
    Homework Helper

    I would have thought gravity and iar resistance is all.

    For all situations, remember the following.

    Field forces arising from Gravity, electrostatics and magnets act without contact.

    All other forces are contact forces - something pushing, or pulling via a thread/string.

    For the egg you can likely rule out electrostatics and magnets, so we have gravity plus anything else that is touching the egg.
     
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook