Expiramental DEsign
Hypothesis: If the amount of pulleys in the system increases the mechanical advantage will increase with it.
Plan: I will lift 1 kg weight with a single fixed pulley system and measure the mechanical advantage, then I will use a movable pulley, then repeat the process with a block and tackle.
Materials Needed: 4 single pulleys, rope/ string, 1 kg weight, spring scale.
Control: The difference in mechanical advantage between each system.
Constant: String, pulley type, amount of weight, type of spring scale.
Independent Variable: Increasing the amount of pulleys and changing the location of the pulley.
Dependent Variable: The mechanical advantage of each system according to the system.
Procedure:
1) Set up a single fixed pulley system with 1 kg weight.
2) Lift down on the string tied to the spring scale and note the readings in newtons.
3) Repeat 1 and 2 three times and record the results, with the movable pulley system and the block and tackle system.
Plan: I will lift 1 kg weight with a single fixed pulley system and measure the mechanical advantage, then I will use a movable pulley, then repeat the process with a block and tackle.
Materials Needed: 4 single pulleys, rope/ string, 1 kg weight, spring scale.
Control: The difference in mechanical advantage between each system.
Constant: String, pulley type, amount of weight, type of spring scale.
Independent Variable: Increasing the amount of pulleys and changing the location of the pulley.
Dependent Variable: The mechanical advantage of each system according to the system.
Procedure:
1) Set up a single fixed pulley system with 1 kg weight.
2) Lift down on the string tied to the spring scale and note the readings in newtons.
3) Repeat 1 and 2 three times and record the results, with the movable pulley system and the block and tackle system.
Quantitative Data: The number of newtons decreased about 1/2, then 1/3 of the 9.8 newton kg, every time the location changed or a pulley was added to the system.
Qualitative Data: The overall weight in newtons decreased each pulley system.
If the amount of pulleys in the system increases the mechanical advantage will increase with it. The results proved that when the pulley system is added pulleys the mechanical advantage increases. For the single fixed pulley, the average weight in newtons for all 3 trials was 9.9, the movable pulley averaged 4.8 newtons, the block and tackle pulley with 2 pulleys, one single fixed and one movable, it averaged 3.48 newtons. Lifting the 9.8 newton object, the single fixed pulley took 9.9 newtons of input force, the mechanical advantage being about 1, the movable pulley took 4.8 newtons, the mechanical advantage being 2, the block and tackle
Qualitative Data: The overall weight in newtons decreased each pulley system.
If the amount of pulleys in the system increases the mechanical advantage will increase with it. The results proved that when the pulley system is added pulleys the mechanical advantage increases. For the single fixed pulley, the average weight in newtons for all 3 trials was 9.9, the movable pulley averaged 4.8 newtons, the block and tackle pulley with 2 pulleys, one single fixed and one movable, it averaged 3.48 newtons. Lifting the 9.8 newton object, the single fixed pulley took 9.9 newtons of input force, the mechanical advantage being about 1, the movable pulley took 4.8 newtons, the mechanical advantage being 2, the block and tackle