Simple Machines
... a supply of string. Part one of the lab involves using the inclined plane. You set the inclined plane at a 30-degree angle. At the top of the plane you attach a pulley. You feed a line of string from the Hall’s carriage to a weight hanger, passing over the pulley. You then add weight to the weight hanger to cause the carriage to accelerate at a steady rate up the incline. Then you measure the total distance the car moved horizontally and the total distance the car moved vertically. Then you changed the angle of the inclined plane and repeated the steps above for a different angle. Part two of the lab called for using a complicated pulley system. You needed enough string to loop around the six pulleys. A weight was attached to the bottom of the system. You then added weight to the other end of the pulleys and recorded how much was needed to lift the weight. You then changed the pulley system someway and repeated the steps. DATA: +/- .5 Part one Weight of Car = 401.4 +/- .05 grams Angle of Plane 30 +/- .5 degrees 45 +/- .5 degrees Fu 220 g +/- .5 310 g +/- .5 Fd 185 g +/- .5 280 g +/- .5 D 78 cm +/- .5 78 cm +/- .5 H 37 cm +/- .5 47.8 cm +/- .05 Friction 17.5 N +/- .05 15 N +/- .5 AMA 1.82 +/- .005 1.29 +/- .005 IMA 2.11 +/- .005 1.63 +/- .005 EFF 86.26 % +/- .005 79.14 % +/- .005 Part Two Number of Pulleys 6 4 Fu 205 g +/- .5 295 g +/- .5 Fd 145 g +/- .5 225 g +/- .5 D 69.3 cm +/- .05 63.3 cm +/- .05 Friction 30 N +/- .5 35 N +/- .5 AMA .205 +/- .0005 .295 +/- .0005 IMA EFF QUESTIONS: 1. The IMA and AMA went down as the angle of the incline increased. When the angle was lower the IMA and AMA was higher. The efficiency also decreased when the angle of the inclined plane was raised. 2. The IMA and AMA went down when the number of supporting cords was decreased. The efficiency also went down when the number of cords was decreased. 3. CONCLUSION: ...