# find the value of g by free fall method readings

We also use different external services like Google Webfonts, Google Maps, and external Video providers. Since these providers may collect personal data like your IP address we allow you to block them here.

Please be aware that this might heavily reduce the functionality and appearance of our site. Changes will take effect once you reload the page. Learn to assess and reduce uncertainty. Consider how to present and process data. The film shows four different methods of measuring g using a falling object: Drop a ball and time its fall with a stopwatch.

Drop a ball through light gates. Use an electromagnetic switch to release a ball bearing, with triggered timing. Other ASE definitions: Accuracy: a result is accurate if it is close to the true value. Uncertainty: the interval within which the true value can be expected to lie.

Calculating g from h and t. Uncertainties arise in four ways: Starting the timer. Stopping the timer. Over short distances and short times , human reaction time destroys the precision of the measurement, and over long distances, air resistance becomes a factor so that the acceleration of the object is no longer constant and the calculation is invalid.

These considerations among others are what forced Galileo to develop his famous inclined plane experiment. The Pasco Free-Fall Adapter gives us the technology to obtain precision timing for objects dropped relatively short distances, however. When the ball is dropped, it activates a switch to start a very accurate timer.

When the ball strikes the pad at the end of its fall, it trips another switch to stop the timer. Yet emerging from Newton's universal law of gravitation is a prediction that states that its value is dependent upon the mass of the Earth and the distance the object is from the Earth's center.

The value of g is independent of the mass of the object and only dependent upon location - the planet the object is on and the distance from the center of that planet. Kinematics Newton's Laws Vectors and Projectiles. What Can Teachers Do Student Extras. We Would Like to Suggest Sometimes it isn't enough to just read about it.

Company Details. About the Company. Legal Status of Firm Individual - Proprietor. Nature of Business Manufacturer.

Number of Employees 26 to 50 People. Annual Turnover Rs. Don't have an account yet? Create one now! By the ball hitting the trap door caused the timer stop. After it was set up I then did a few little tests to see if all the equipment was working and that I had a full understanding of how to operate my equipment. I then set up my experiment with the heavier ball bearing found easily due to the significant difference in weight between the two ball bearings , as I believed this would be less affected by air resistance, and would also hit the trap door with more force which would mean less of a delay time due to the friction of the trap door.

Once all set up then I started the process of taking readings. To start the timing all I needed to do was release the ball bearing by pressing on the holder at its top.

The ball then fell the set height and hit the trap door in turn stopping the timer. I then wrote down the time on my sheet against the height. I then repeated this three times for each height. I then did the same again twice more giving me three sets of results. I did this so that each time I would need to reset up the experiment, meaning I could see if the outliers were due to the accuracy of my measuring of the height as well as the setting up of the equipment. A minimum of three sets were needed so I could compare my results, and know if one set was completely wrong as well as any outliers for that whole height.

Equations and Physics To talk about acceleration due to gravity under free fall, we must first have an understanding of what free fall is. Free fall occurs when an object is acted upon by gravity alone, so without any other forces acting upon it including air resistance. Any object under free fall experiences acceleration due to gravity. Acceleration due to gravity is a natural phenomenon.

I found that at a height of 1. If not at the center, and closer to the edges of the trap door, the results were 0. Because the range and standard deviation of the data is greater not at the center, I will be using the center of the trap door for the ball bearing to hit as this will give me less uncertainty in my results.