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You can NOT solve this Problem, however please give it a try

  1. Feb 12, 2009 #1
    1. The problem statement, all variables and given/known data
    Let's say there is an object, which is moving in the straight line...(on earth, however do not consider gravity yet)

    However all the sudden i add some other weight on one part of this object!
    Then what will happen?
    Will the object keep going like it suppose to be or tilt?

    2. Relevant equations
    I will solve it myself, if had...duh?

    3. The attempt at a solution
    I tried to google it, however google gives nothing... but ads...

    P.S.: I am a 9th grader... don't expect me smart enough to understand anything...
  2. jcsd
  3. Feb 12, 2009 #2
    Is weight added, or is mass added. The addition of weight implies that the object is now under a gravitational force. If "weight" is added, the path will change, because the object will undergo an acceleration. However, if only MASS is added, and the object is not under the force of gravity, it will continue on its linear path.
  4. Feb 12, 2009 #3
    I think the mass will be an external force to the moving object
    therefore it will undergo acceleration
    so I think tilt is more reasonable than stay the same
  5. Feb 13, 2009 #4
    It doesn't matter, because it is just other force.
  6. Feb 13, 2009 #5


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    Could you perhaps be more specific about the collision. For example, is the mass 'dropped' onto the moving object, placed in front of it or does it collide with the moving object from behind?
  7. Feb 13, 2009 #6
    nah it is ok, i just want make sure noone can answer it, because it is MY PHYSICS PROJECT, AND NOONE IS GOING TO RUIN MY IDEA!
  8. Feb 14, 2009 #7
    If the object is moving along the ground and a mass is added, then the force of friction will increase and the object will slow down.

    If it is moving in the air (e.g an airplane), then the additional mass will be an additional force acting on the object, and the object will rotate about the center of mass.

    If the mass is dropped ON the center of mass, then it will create an additional force and the moving object will be lowered, unless an equal and opposite force is applied to the dropped mass the instant it hits the moving object, and then things will stay the same.
  9. Feb 14, 2009 #8
    can i use your quote in my project?
  10. Feb 14, 2009 #9
    If by adding mass, you mean magically increasing the mass without exerting a force on the object, there would be no change if it is traveling in a vacuum.

    If you mean like drop a bowling ball onto the object, then it's path would be altered according to the direction of the applied force and other variables.
  11. Feb 14, 2009 #10
    ... duh? my experiment idea is to find the equation for it!
    Don't steal my physics experiment or i am doomed... this is very important experiment, a new forumla!
  12. Feb 14, 2009 #11


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    That's assuming you have magically added magically moving mass.
  13. Feb 14, 2009 #12
  14. Feb 14, 2009 #13
    please do not think about mass, but consider other force that is suddenly added to the projectile. ( i can add the force! just need to do some calcuation, and then i can fire a rock or something to hit the bottom of the rocket and cause the rocket get extre force)
  15. Feb 14, 2009 #14


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    A massless rock hitting a massless rocket?

    In all seriousness we could provide more help if you'd give us a little more detail regarding your gedanken experiment.
    Last edited: Feb 14, 2009
  16. Feb 14, 2009 #15


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    Just make sure Galactor won't steal your plans.
  17. Feb 14, 2009 #16
    i mean consider it has weight... gosh, you don't understand at all...
  18. Feb 14, 2009 #17
    I doubt you'll be able to get any good experimental results from firing a rock at a rocket. This problem is easily solvable by the conservation of momentum if we knew the specifics of the problem. However your definitions of force, mass and weight seem to be murky at best. Perhaps a quick browse of wikipedia would help?
  19. Feb 14, 2009 #18
    sorry but this is my experiment and there are mean people on the internet, which mean i can not yet tell you my experiment before i publish my experiment.

  20. Feb 15, 2009 #19
    dear 9th grader,

    an object can move in many different ways. if the object is spinning, addition of mass to any part on the orig. mass that is not at the center of mass will alter the way the object spins. if the object is merely moving in linear displacement without spin and gravity is not considered, the object cannot tilt.

    Remember, an object in motion will continue to move without a force (gravity)
  21. Feb 15, 2009 #20
    If you give me proper credit.

    But if you really want to come up with a formula (or formulae) for this, then you need to understand the basics of mechanics (i.e kinetics and kinematics).

    Now if the mass of the object magically increased (as some people are suggesting), then that's a different story.

    But some understanding of the physics of the problem (and the appropriate definitions) would probably lead to a solution to your problem.
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