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Unit 6 – Lecture 2

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Inclined Plane Composed of an even, sloping surface makes it easier to move a load to a higher elevation MA = slope length height of inclined plane slope length height

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Inclined Plane The effort force increases as the slope steepens.

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Practice What is the MA of the inclined plane shown below? When a hill is very steep, what do we do to decrease the effort force we have to apply to move an object? [think about driving…]

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Wedge A wedge is a modified inclined plane. used for separating or holding composed of: one inclined plane two inclined planes joined together

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Wedge MA wedge = slope length wedge width slope length width

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Screw A screw is also a modified inclined plane MA screw = circumference of screw threads per cm

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Practice Inclined Planes Length = Height = 3 m MA = 1256 Height = 4m Length = 581 m MA = 3768 m 145.3

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Practice Calculate the Efficiency A box weighing 100 N is pushed up an inclined plane that is 5 meters long. It takes a force of 75 N to push it to the top, which has a height of 3 meters. HINT: Find & compare the MAs [IMA and AMA]

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Practice Calculate the Efficiency A box weighing 100 N is pushed up an inclined plane that is 5 meters long. It takes a force of 75 N to push it to the top, which has a height of 3 meters. HINT: Find & compare the MAs [IMA and AMA] IMA = what the machine SHOULD do length / height = 5 / 3 = 1.67 AMA = what the machine actually does Force(resistance) / Force(effort) = 100 / 75 = 1.33

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Practice Calculate the Efficiency A box weighing 100 N is pushed up an inclined plane that is 5 meters long. It takes a force of 75 N to push it to the top, which has a height of 3 meters. HINT: Find & compare the MAs [IMA and AMA] Is the actual efficiency less or more? So…what is the process you do to find out how much of the ideal the actual really is? (1.33 / 1.67) * 100 = 79.64

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Homework Complete Inclined Planes w/s [page 7] Mechanical Advantage w/s [pg 8] NOTES: you will be completing through page 11 by tomorrow, so if you finish early, you may want to continue working your projects are due MONDAY!!!

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