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**Simple Machines: Inclined Plane, Wedge, Screw**

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 MAwedge = slope length wedge width width slope length

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**Screw A screw is also a modified inclined plane**

MAscrew = circumference of screw threads per cm

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**Practice Inclined Planes Length = Height = 3 m 3768 m MA = 1256**

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 IMA = what the machine SHOULD do**

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 Is the actual efficiency less or more?**

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 NOTES: 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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