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!

Help with acceleration, magnitude, and direction of force

  1. Oct 20, 2008 #1
    1. The problem statement, all variables and given/known data

    As a baseball is being caught, its speed goes from 28.0 m/s to 0.0 m/s in about 0.0050 s. The mass of the baseball is 0.140 kg.

    What is the baseball's acceleration?
    What are the magnitude and direction of the force acting on it?
    What are the magnitude and direction of the force acting on the player who caught it?

    2. Relevant equations

    f=ma?

    3. The attempt at a solution

    28.0 m/s x 0.140 kg = 3.92
     
  2. jcsd
  3. Oct 20, 2008 #2

    LowlyPion

    User Avatar
    Homework Helper

    You calculated momentum. The force will be change in momentum over the time period.

    If v = a*t you should be able to figure the acceleration.
     
  4. Oct 20, 2008 #3
    so 28.0 m/s x 0.0050 s?
     
  5. Oct 20, 2008 #4

    LowlyPion

    User Avatar
    Homework Helper

    Not the way I do algebra.
     
  6. Oct 20, 2008 #5
    v divided by 0.0050 s? please help me i really need to get this done
     
  7. Oct 20, 2008 #6

    LowlyPion

    User Avatar
    Homework Helper

    That gives you acceleration.
     
  8. Oct 20, 2008 #7
    but isnt v = velocity? and v = distance/time? they dont give me a distance
     
  9. Oct 20, 2008 #8
    someone help please
     
  10. Oct 21, 2008 #9
    Can you do better than randomly multiplying quantities? Pion gave you v=a*t, which quantities do you know in this equation?
     
  11. Oct 21, 2008 #10
    you're going to need an equation that can find the acceleration (or deceleration) when given an initial as well as final velocity and time.

    I suggest

    Vf=Vo+at

    that should give you acceleration
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?