1. Limited time only! Sign up for a free 30min personal 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!

Homework Help: Force help

  1. Oct 1, 2004 #1
    A ball of mass 1.6 kilograms is projected with a velocity 16.6 m/s in a direction 74.7 degrees from the horizontal. The acceleration due to gravity is g = 9.81 m/s2. What is the force acting on the ball when it is at the uppermost point in its orbit?

    Is the force acting on the ball zero because it is at the edge with no acceleration.
    F=ma so (1.6kg * 0m/s^2)
     
  2. jcsd
  3. Oct 1, 2004 #2
    The force due to gravity is essentially constant close to the earth's surface.
     
  4. Oct 1, 2004 #3
    It's not zero acceleration when it's at the peak, it's zero velocity. It has a negative acceleration that slows it down to it's peak.
     
  5. Oct 1, 2004 #4

    Pyrrhus

    User Avatar
    Homework Helper

    Try using convervation of mechanical energy, it'll help.
     
    Last edited: Oct 1, 2004
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook