![]() How well do your measurements agree with the accepted value of ~9.78 m/s/s? How well do the two values compare? What may have caused the difference in the two values? (HINT: Think about the effect of pendulum length on the period. Using the formula given above, calculate the gravity.Ĥ. Time how long the pendulum takes to make 10 oscillations.ģ. Alternative: Make a pendulum using 1.5 m of string, a lead fishing weight and a ring-stand apparatus (or equivalent)Ģ.The slow, regular motion of the lamp inspired Galileo to check the measurements for gravity (which he had previously done using the inclined plane) by using the well known formula for the period of a pendulum: t = 2 pi sqrt (L / g) where L is the length of the pendulum. For this experiment, you will need: One day, while attending a Mass in the Duomo di Pisa, Galileo noticed that the lamp above him was swaying slowly. How well do your measurements agree with the accepted value of ~9.78 m/s/s? Why do you think the difference in the times between the two balls exists? (HINT: Think friction!) Measuring gravity with a pendulum Repeat with the steel ball, and compare the results. Where d is the diameter of the ball, t 1 is the time the ball takes to pass through the first gate, t 2 is the time the ball takes to passthrough the second gate and t 12is the time the ball takes to pass between gates.ĥ. Release the ball, and record the times one the board. Show that the acceleration due to gravity can be found from the difference in velocities, as measured at the two IR sensors. Place the small plastic ball that came with the ball drop apparatus. Point out that (to a first-approximation) the weight of the ball does not affect the rate at which it falls.Ĥ. Release the balls, and note the simultaneous noise of the impact. ![]() Hold the balls in one hand, at a height of at least one meter over the table. Have the students predict which ball will hit the ground first, the heavier or the lighter, and record their predictions on the blackboard.ģ. Double-check to make certain that the battery is charged, and that the room is dark enough for the IR sensors to work.Ģ. Set up the Ball Drop apparatus before class. 2 Balls, of roughly the same size, but different weightsġ.The free-fall experiment is to determine the acceleration due to gravity. Ball drop apparatus (Fisher VBS40881-1 $40.0 and VBS40990-1 $339.00) results in a large tension force so that the sensor position becomes higher.To replicate his experiment, you will need: (In actuality, he never dropped anything from the Leaning Tower of Pisa instead, he had them dropped from the crow’s nest at the top of a sailing ship.) Perhaps the most famous of Galileo‘s experiments involved dropping two balls from a great height. Measuring gravity using the ball-drop method Measure acceleration of gravity using the period of a pendulum.Understand the limitations of this method.Measure the acceleration of gravity using the ball-drop method.Explain how the acceleration of gravity gives a planet’s mass.Calibration equipment is a breeze with that feature. I really like moving the mouse pointer to a position and having the Time and Voltage display the values at that point. We were a bit hesitant at first … but it worked flawlessly, and everybody is now out shopping for PicoScopes! T Lövskog Rather than webcam our benchtop scope screen, it was suggested we use a PicoScope to share waveforms via screen share. So simple to use & beats any other I have ever used hands down. Since the included software is really stable, this type of device is a great tool for great tasks! Helmut SchoettnerĪ superb piece of equipment worth its weight in gold Nigel Clinch Perfect Partner for Development of Encoder controlled Stepper Motor Actuators. If I could give 6 stars for customer service - I would do so. Customer service gave me first class service. I had a weird problem - it did not work on one of my PC’s. PicoLog TC-08: This is a very nice unit that works consistently and reliably. We have been using Picoscope 6404D for quite some time, and are amazed by its accuracy and powerful emulations while working with numerous signal evaluations. This made my decision much easier when I was looking to buy an USB scope. Not many USB scopes works on Win & Mac & Linux too, so that proves me that guys from Pico really cares about us, customers. Storage of waveforms on my Laptop is very easy allowing me to quickly email waveforms to my Colleagues. I travel abroad so this has been ideal due to its physical size. I have been using my 4224 PicoScope for years. Superb kit, superb support, what more can I say. The kit (2408B) is of obvious quality, easy to setup and calibrate and the free to download software has a reasonable learning curve.
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