Foundations of Physical Science Ropes & Pulleys: Mechanical Advantage Key Questions Overview Simple Machines Include:

Foundations of Physical Science Ropes & Pulleys: Mechanical Advantage Key Questions Overview Simple Machines Include: www.phwiki.com

Foundations of Physical Science Ropes & Pulleys: Mechanical Advantage Key Questions Overview Simple Machines Include:

Bushee, Ward, Executive Vice President and Executive Editor has reference to this Academic Journal, PHwiki organized this Journal Foundations of Physical Science Workshop: Ropes & Pulleys: Mechanical Advantage Ropes & Pulleys: Mechanical Advantage CPO Science Key Questions What are simple machines How do simple machines work

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Overview Build a simple machine using ropes in addition to pulleys Measure the input in addition to output as long as ces of different pulley arrangements needed to lift load Compare the input as long as ce needed by different pulley arrangements to lift load Simple Machines Include: rope in addition to pulley wheel in addition to axle systems gears ramps levers screws Pulleys as Simple Machines Simple machines can change the direction in addition to /or magnitude of an Input Force

Pulley Investigation 1 Add a few weights (3 or 4) to the bottom block The bottom block in addition to the weights are the load to be lifted Use the Force scale to measure the weight of the load – record it Pulley Investigation 1 Why does the pulley have so many strings Red Strings support bottom pulley block only when hanging Yellow String is the one we pull to lift the lower block, it then supports the block in addition to transfers the lifting as long as ce to the block How Can We Lift the Block 1. We can attach the yellow string to the bottom block in addition to then thread it up in addition to over the top set of pulleys in addition to pull OR . 2. We can attach the yellow string to the top block, thread it down through the bottom pulley set in addition to then up in addition to over the top set of pulleys in addition to pull

Measure the Input Force Attach the Spring Scale to the pulling end of the yellow string Pull on the string in addition to lift the load – read the value from the scale as this happens Lower the load with the string – again read the scale as this happens Average the two values from the scale – this is the value of your Input Force Measure the Input Force as long as Two Supporting Str in addition to s Unclip the yellow string from the bottom block Thread the string through the lower set of pulleys Attach the yellow string to the top block Repeat the Input Force measurement process as long as TWO supporting strings Looping the String Around the Pulleys Supporting strings : 1, 3, 5 Supporting strings : 2, 4, 6

Forces Involved The Weight of the load does not change, it is the same as long as each trial The Output Force will be the as long as ce required to hold the load still– it does not change since the weight remains the same As more strings are added, the Input Force required to achieve the same Output Force decreases Mechanical Advantage Ratio of Output Force to Input Force Follows simple pattern with Ropes in addition to Pulley system What is the Mathematical Rule We found that the input as long as ce required to lift the load decreased as the of supporting strings increased What is the relationship of strings x Input Force = Weight of load of strings = Mechanical Advantage

Bushee, Ward San Francisco Chronicle Executive Vice President and Executive Editor www.phwiki.com

Bushee, Ward Executive Vice President and Executive Editor

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