Physics Lab write up 8

# The linear acceleration a is related to angular

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F=m(g-a). The linear acceleration, a, is related to angular acceleration by the equation: a=Dα so that the force can be expressed as: F=m(g-Dα). The students will be able to perform this experiment using a computer, 750 interface, rotational apparatus, smart pulley, pulley, 25 gm weight, string, meter stick, vernier caliper, bull’s eye level, 2kg electronic scale, and weights. To start the experiment one student must use a bull’s eye level to level the rotational motion apparatus. Then get a string about 90 cm long. Next tie one end to the small hole in the bottom/largest spool attached to the spindle and then ties the other end of the string to the mass holder. Next the students will use calipers to find the radius (D) of the largest/lowest spool and record that data on the data page. Next they must clamp the individual pulley to the leading edge of the rotation motion apparatus. Then suspend the string over the individual pulley that is attached to the leading edge of the rotational apparatus, while making sure the mass holder will not hit the floor at the lowest point of its fall. Next, attach the smart pulley to the rotational motion apparatus so that it is in contact with the platen and is free to spin when the platen spins. Next they must add 20 grams to the mass holder while recording the weight and the mass holder (m) in the data table. Now the students are ready to actually start. The students will plug the smart pulley into channel 1 of the 750 interface, open the data studio, click create experiment, and click channel 1 and select the smart pulley. Next they will click the constants tab and make sure the smart pulley constants are set as follows: Spoke arc length 0.015, spoke angle separation 36°. Then the students will click the 2 nd measurement tab and check the angular velocity box while making sure the units are in radians/sec. Under display, tabs select graph and choose angular velocity. To run the experiment: rotate the platen to windup the string on the largest spool. Windup the string until the mass holder is just below the pulley. Press start and release the platen allowing the

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