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LAB 2 Final

# LAB 2 Final - Another real-life example of a pulley as a...

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ARSC 010 September 19, 2007 Mini-Lab Report for Lab 2 Simple Machines, Work, and Motion 1.) 2.) In question 1, I chose to analyze an inclined plane aiding a cyclist on a tough hill and a pulley in an elevator to explain two simple machines. However, there is an even more precise way to analyze how simple machines work and what they actually do to reduce force. The best way to describe this relationship between work, force, and distance, is to use the formula W=fd. This means that the work is equal to force, multiplied by distance. Both Another real-life example of a pulley as a simple machine is an elevator. When people enter a building taller than one-story, they often need an easier way to reach the floors above. Would you rather climb straight up a vertical plane to the floor you need, or would you rather take the elevator? Most people opt for the elevator. Elevators are an example of how a simple machine can reduce the effort force necessary to reach the higher floors. First, it must be clear that this is a discussion about simple cable- elevators, not hydraulic elevators. In cable-elevators, there is a pulley at the top of the elevator shaft [much like the pulley at the top of our apparatus in lab] and cables that run through the pulley [the string in class] are attached to the elevator cart [this would be akin to the 200g weight in lab]. The pulley eases the amount of force required to lift the elevator from one floor to the next by extending the distance that the elevator is pulled. This kind of pulley also reduces effort force by changing the direction the cable is pulled towards. For example, it takes less effort to pull a cable down towards gravity than to pull it up – in which case more effort is required to work against gravitational forces. The difference between elevator pulleys and our lab pulley is that rather than a person pulling on the cable, there is a counterweight that is used instead.

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