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Thread: need a high school experiment for free fall

  1. #1 need a high school experiment for free fall 
    Forum Freshman
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    Hi to all,
    I am new to this forum. I am studying high school and i need to describe an experiment to determine the acceleration of free fall using a body as stated in my syllabus. So if anyone reading this topic can help me then please do it.


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  3. #2  
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    The simplest experiment would probably be: a stone, a timer and window at a known height. (if height is unknown you have may have to measure it).

    If you are allowed to assume acceleration is constant during the whole fall then fall time and distance is all that is needed to calculate the acceleration.


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  4. #3  
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    in order to be considered free fall then air drag should not be occuring to slow down the falling body. so dropping a stone won't quite work, unless you've got an evaculated cylinder handy.

    i would recommend filling a cylindrical bucket with water, and setting up a photogate overhead.

    swing the bucket in a full circle overhead at slower and slower speeds untill water falls from it. the diameter of the bucket divided by the time the photogate is interupted is equal to the speed of the bucket. at a certain speed the bucket will just barely be able to keep the water in it. that is the speed the water is falling at. it is a somewhat messy experiment, but if you only have to describe it then this is a good way to do it. also if you don't have to do it, then i'd change the person swinging the bucket to a robotic arm for more consistency and control.
    physics: accurate, objective, boring
    chemistry: accurate if physics is accurate, slightly subjective, you can blow stuff up
    biology: accurate if chemistry is accurate, somewhat subjective, fascinating
    religion: accurate if people are always right, highly subjective, bewildering
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  5. #4  
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    Thanks for your replies. One thing i don't understand is what is a photogate.
    I lost my fear toward the kiss, i do my best.
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  6. #5  
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    it's a useful little tool that most science teachers have. it is a device that fires photons from one place to another. it is set up so that they hit a receptor, when something interupts the photons time begins recording, and with a switchboard it can be recorded untill a second photogate is triggered, or untill the first photogate is no longer triggered. ask your physics teacher if you need any more info, chances are they use them frequently.
    physics: accurate, objective, boring
    chemistry: accurate if physics is accurate, slightly subjective, you can blow stuff up
    biology: accurate if chemistry is accurate, somewhat subjective, fascinating
    religion: accurate if people are always right, highly subjective, bewildering
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  7. #6  
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    Ok i got it.
    I lost my fear toward the kiss, i do my best.
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