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Questions about uniformly accelerated motion under gravity

  1. May 18, 2016 #1
    I am not able to understand that why when a body is travelling against the gravity, there will be a point somewhere (which will be known as the maximum point where it will change its path, towards the ground) where the body's velocity become 0 m/s. Then it returns to the ground.
    So my doubt is why does a body moving with uniform motion stops at one point, & changes its path towards the ground?
  2. jcsd
  3. May 18, 2016 #2

    Simon Bridge

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    Look up "Newton's Laws of motion" and Newton's Law of Gravitation".
    That is all you need to model motion in gravity for most situations you will encounter.
    What are you having trouble with? The body is being acted on by an unbalanced force: gravity.
  4. May 18, 2016 #3


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    When an object is in freefall,
    gravity (near the earth surface) is continually decreasing the vertical component of the velocity vector at the rate of "9.8 m/s per second" (the freefall acceleration).

    When the object's vertical component of velocity changes from positive to negative (passing through zero), its vertical motion turns around.
    Throughout this motion, the horizontal component of velocity is unchanged--- that is to say, the horizontal motion is uniform.
    (The vertical motion [ie. vertical component of velocity] is not uniform... but its "change with time" is uniform ["the vertical component of acceleration is constant"].)
  5. May 18, 2016 #4
    "Uniformly accelerated motion" does not mean "uniform motion." The adverb "uniformly" is modifying "accelerated," not "motion."
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