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prosteve037

Joined: 25 Sep 2010
Posts: 6
Location: 222

 Posted: Wed Sep 29, 2010 10:27 pm    Post subject: Would these factors affect the result of gravity? A ball is dropped from a height and lands on a calibrated timer. If the timer calibration were off by a constant factor, would the resultant gravity be affected? If the height of the ball was off by a constant amount, would the resultant gravity be affected? ----------------------------------------------------------------------------------------- I'm not understanding what the constant factors/amounts are. What would be a constant factor or amount?
hepcj

Joined: 23 Jun 2007
Posts: 125

 Posted: Thu Sep 30, 2010 10:04 pm    Post subject: What exactly are the details of the experiment? How is the timer activated? As you have described it, the experiment it does not make any sense. I presume the timer starts when the ball is dropped and stopped when the ball hits it.
prosteve037

Joined: 25 Sep 2010
Posts: 6
Location: 222

 Posted: Fri Oct 01, 2010 2:31 am    Post subject: Yes that's what happens. The ball is dropped onto a timer that starts timing the ball when it is dropped and stops timing the ball when it hits it.
hepcj

Joined: 23 Jun 2007
Posts: 125

 Posted: Fri Oct 01, 2010 6:37 pm    Post subject: Okay, then you need to consider the experiment itself. If your initial time is out by a fixed amount and your end time is out by the same amount. You will be taking the difference, so does this affect the time measured? There's your answer. As for the height, if you make an error in measuring it, then the time that you measure for the ball will be different so this will have an effect on the result. The thing is, maybe the timing is not accurate enough to determine that the result was affected. When ever you take experimental measurement you need to say what the level of uncertainty is in the measurement. In measuring the time you might be able to measure it with a precision of 1/100 of a second but if you are controlling the stopwatch by eye, then this precision may fall to 1/5th of a second and how well you can measure the height could be to the nearest millimetre through parallax, etc.
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