LabAtwoodsMachine

# LabAtwoodsMachine - the blocks when they have moved a...

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1 OBJECTIVE To calculate the acceleration of the Atwood’s Machine experimentally by using the kinematic equations of motion and to compare to the expected value obtained from applying Newton’s 2 nd Law to the Atwood’s Machine. EQUIPMENT 1. pulley 2. rod 3. stop watch 4. pan balance 5. masses 6. 2-meter stick THEORY Using Newton’s 2 nd Law 1. Draw a free-body diagram of mass M 1 and mass M 2. 2. Select an appropriate coordinate system for each mass. 3. Apply Newton’s 2 nd Law to each mass by using the corresponding coordinate system. 4. Obtain an expression for the acceleration of the blocks in terms of M 1 , M 2 , and g. That is a = a (M 1 , M 2 , g). This expression will give the theoretical (expected) value for the acceleration. M 2 M 1 H rod pulley ATWOOD’S MACHINE

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2 Using the Kinematic Equations of Motion 1. Using one of the kinematic equations derive and expression for the acceleration of
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Unformatted text preview: the blocks when they have moved a distance H starting from rest in a time t . Your expression will be in terms of H and t . That is a = a(H, t ). This expression will give the experimental acceleration. The PROCEDURE 1. Setup apparatus as shown on equipment section. 2. Choose M 1 = 180g and M 2 =150g. 3. Adjust M 1 and M 2 so that M 1 falls through a height H 130 cm. 4. Release M 1 from rest and measure the time of fall t for a total of 5 runs. 5. Repeat steps (2) and (3) for M 1 = 230g and M 2 =200g. 6. Calculate a exp and a theo for each set of data. 7. Construct a data table like the following: H(cm) M 1 M 2 t 1 a 1 t 2 a 2 t 3 a 3 t 4 a 4 t 5 a 5 a ave a theo %error 130 130...
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## This note was uploaded on 09/02/2011 for the course PHYS 2A taught by Professor Luna during the Fall '09 term at DeAnza College.

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LabAtwoodsMachine - the blocks when they have moved a...

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