1. Not finding help here? Sign up for a free 30min 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!

Force questions

  1. Feb 5, 2008 #1

    can someone help me please with these questions?
    i have read all the newton law but still not understanding these question properly

    1.what is an force?
    2.how do we know a force is acting?
    3.what effect can force have?
  2. jcsd
  3. Feb 5, 2008 #2
    1) A force is that entity that tends to cause a body of mass to accelerate.
    2) This is tricky. I think they mean "how do we know when a net force is acting", and the answer would be:"we observe an acceleration of the body to which the force is applied"
    3) Acceleration; deforming a body.
  4. Feb 5, 2008 #3
    in definition F=ma from newtons law- m in kg and a in m/s so you end up with a kg*m/s, which is called a newton. An example...

    You have a 300g ball on a string, what is the force of gravity on the ball?


    acceleration due to gravity is 9.8m/s[tex]^{}2[/tex] so...

  5. Feb 5, 2008 #4
    a is m/s[tex]^{2}[/tex] so you actually end up with [tex]\frac{kg * m}{s^{2}}[/tex] which really is called a newton, denoted as N.
  6. Feb 5, 2008 #5
    Well, can change mass and can change velocity...i guess that's it...
  7. Feb 5, 2008 #6


    User Avatar
    Homework Helper

    A force is what causes a mass to accelerate.

    A force acts when a body is "accelerating" so to say
    A force can cause a mass to accelerate,change velocity(and speed)
  8. Feb 6, 2008 #7
    thank you guys this was great help from your comments
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?

Similar Discussions: Force questions
  1. Tension Force Question (Replies: 8)

  2. Forces question (Replies: 1)

  3. Forces question (Replies: 1)

  4. Force Question (Replies: 3)