background: questions: 3a. Why is a better result obtained when you use a very l

Question

background:

questions:

3a. Why is a better result obtained when you use a very large net force?

b. In the calculation of the acceleration, we have assumed that the pulley is frictionless. Can you find a simple way in the experiment to test whether this is true? If so, how to correct for it?

thanks

M1 The Awood General Physics I Lalb MI The Atwood Machine In this experiment, you will learn the hasic operation of computer interficing experimental study of Newton's second law Purpose facing and use it in an Science Workshop 750 Interface, Smart palley, mass set, hanger (x2), stand cushion, thread. Equipment and components and c omputer interfacing consists of three main components: sensors, an and a Background control program to be run in a host computer (software), Meas nic output are called sensors and they are used to measure Measuring devices w with an the lay, manipulate and analyze the and output the data to erts the data fror box (Science Workshop 750). The interface box collects and c Computer interfacing alow , a computer interface program (DataStudio) is used. Com collect large amounts of data with high speed and accuracy. Nowadays, most phys research experiments use computer inter In the following, we gne a brief introduction to the hardware and software to experiment. Please refer to the "Help" menu of the DataStudio program for mo the sensors and output them to the host computer. To display, manipulate and anal data s s us to be used in the In the experiment to be carried out below, the basic control program has been written you, and you may start the experiment by running the program right away. However strongly recommended that you understand the basic operation of the l. Connect the Science Workshop 750 interface box to the computer. Turn on the interface However, inis interfacing. and the computer Double-click the DataStudio icon to start the program. Select "Create Experiment" in the welcome screen. A new experiment setup window will display as shown in Figure 1. Physically connect the senson's) to the interface box by plugging the connector of the sensorís) to the appropriate channel(s). There are two types of sensors: analogue and 4. digital. Click on the corresponding channel to add a sensor for measurement. 5. 6. Click the sensor icon to view and setup the sensor properties, such as the sample rate, 7. Double-click or drag the data display icon in the Displays list menu to display the 8. The setup is ready now. Click the "Start" icon to start data recording or select the measurements, calibration, etc. of the sensor, as shown in Fig. 2. measurement Monitor Data" from the "Experiment" menu to monitor the measurement withou recording the data.

Explanation / Answer

3a. Better results are obtained when a large force is used because of the fact that pulley has a constant friction ( near constant). With large force, this constant becomes fractionally small, and hence reducing tghe error in the experimental results. Hence using a large force improves experimental results

b. In calculating the acceleration we have assumed the pulley to be frictionless

To check this, a simple way would be to wind a mass on the pulley with a cord and allow it tro fall and measure its free fall time and distance, this gives us acceler5ation of falling body, which when less than the expected value 'g' is due to pulley friciton, This friction can be greatly reduced though , by adding lubricants to the pulley to reduce its friction

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