Transcription of CONDUCT AN INVESTIGATION - Nelson
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CONDUCT AN INVESTIGATION - Nelson
44 Chapter 2 Getting to WorkNELtriple pulleyspring scalestandard mass/washerssingle pulleymetre stickdouble pulleystringMechanical Advantage and PulleysPulley systems are an important part of many machines. In this INVESTIGATION , you will be testing factors that might infl uence the actual mechanical advantage of pulley systems. A single fi xed pulley, like the one in Figure 1(a), has an ideal mechanical advantage of 1 since the eff ort force (120 N) is equal to the load force (120 N). However, in the single movable pulley (Figure 1(b)), half of the load is supported by the rope attached to the ceiling. Th e other half is supported by the free end of the rope, where the eff ort force is applied. Th erefore, the eff ort force needed to move the load is only one-half the load force, or 60 N. Th e mechanical advantage of this pulley is 2.
44 Chapter 2 • Getting to Work NEL triple pulley spring scale standard mass/ washers single pulley metre stick double pulley string Mechanical Advantage
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