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Thread: force for acceleration

  1. #1 force for acceleration 
    Forum Freshman almirza's Avatar
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    AS we know a force is required for accelerating an object .
    But i do not know what i think is right or wrong.
    if we act on an object with a constant force it will move with the same speed but if we increase our force on it it will accelerate.
    what i mean to accelerate an object we need an increasing force.


    what are your comments.......
    ia m waiting friends...........


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  3. #2 Re: force for acceleration 
    Forum Radioactive Isotope mitchellmckain's Avatar
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    Quote Originally Posted by almirza
    AS we know a force is required for accelerating an object .
    But i do not know what i think is right or wrong.
    if we act on an object with a constant force it will move with the same speed but if we increase our force on it it will accelerate.
    what i mean to accelerate an object we need an increasing force.


    what are your comments.......
    ia m waiting friends...........
    No, this is incorrect. A constant net force produces a constant accelertation. However on the earth an applied force which results in acceleration usually results in an increasing resistance force until this cancels the applied force resulting in a net force of zero and therefore a constant velocity. For example, if you drop out of airplane at 50,000 feet you will experience a constant downward force due to gravity which causes a constant downward acceleration of 32 feet/second^2. However as your downward speed increases, air resistance also increases which an upward force opposed to gravity. Eventually this upward force balances the downward force due to gravity and you reach what is called the terminal velocity and you do not fall any faster. At this point the force of gravity is cancelled by air resistance and your net force is zero, so your acceleration is also zero. The skydiver knows how to use his body shape to increase and decrease the air resistance controling how fast he falls.


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