# Activity 1.1.1 Simple Machines Inclined Plane Wedge and Screw

Simple Machines Inclined Plane, Wedge, and Screw Principles of Engineering 2012 Project Lead The Way, Inc. The Six Simple Machines Inclined Plane Wedge Screw Inclined Plane A flat surface set at an angle or incline with no moving parts Able to lift objects by pushing or pulling the

load Inclined Plane IMA DE IMA = DR f 0 . 15 t DE = Distance traveled by the effort = L DR = Distance traveled by the resistance = H L( slope)

IMA = H What is the IMA of the inclined plane above? IMA = 15.0 ft / 4.0 ft = 3.75 = 3.8:1 4.0 ft 50 lb Inclined Plane AMA FR AMA = FE f 15 t

4 ft lb 0 2 What is the AMA of the inclined plane above? 50.lb AMA = 20.lb AMA = 2.5 = 2.5:1 What is the efficiency of the inclined plane above? AMA 100= 2.50

100 = 67% % Efficiency = IMA 3.75 Wedge Functions as a moving inclined plane Tapers to a thin edge and is used for splitting, raising heavy bodies, or for tightening by being driven into something Wedge IMA L 10.0 in. DE

IMA = DR H 3.0 in. DE = Distance traveled by the effort = L DR = Distance traveled by the resistance = H L( to height) IMA = H What is the IMA of the wedge shown? IMA = 10.0 in. / 3.0 in. = 3.33 = 3.3:1 250. lb Wedge AMA FR

AMA = FE 700.lb AMA = 250.lb L 10.0 in. What is the AMA of the wedge shown? H 3.0 in. 700. lb 700. lb

AMA = 2.80 = 2.80:1 What is the efficiency of the wedge shown? AMA 100= 2.800 100 = 84% % Efficiency = IMA 3.333 Screw Two Components An inclined plane wrapped around a cylinder, forming the path and pitch A wheel and axle used to

create rotary motion Properties Change rotary motion into linear motion Used as a threaded fastener Large MA Large amount of friction loss Screw Identification Effort Arm Distance If using a wrench, effort arm distance would be the length of the wrench Pitch Thread Information 1/2 13 NC Diameter

Thread description coarse or fine Threads per inch Distance between threads and linear distance traveled by 1 rotation of the screw Diameter Pitch is equal to 1 over the number of threads. If 13 threads per inch, then Pitch is 1/13 of an inch. How far will a screw with 13 threads per inch move linearly if turned one full rotation? 1/13 of a inch Screw IMA

DE IMA = DR 1/4 20 NC DE = One rotation of the effort arm = Circumference DR = Linear distance traveled during one rotation of the effort arm = Pitch Circumference 2 r r IMA = = Pitch P What is the IMA of the screw above if effort is applied by an 8.0in. long wrench?

2 r 8.0inin IMA = = 10in0in5.31 = 1.0in 10in3 1in. 20in Screw AMA FR AMA = FE What is the AMA of the screw shown? 1/4 20 NC 8 in. 35 lb

1200lb AMA = AMA = 34.29 = 34:1 35lb 1200 lb What is the efficiency of the screw shown? AMA 100= 34.29 100 % Efficiency = = 3.4% 1005.3 IMA Why is efficiency so low?

Compound Machines Simple machines working in combination to complete a task Calculating mechanical advantage MA TOTAL = MA1 MA 2 MA 3 ... Image Resources Microsoft, Inc. (2008). Clip art. Retrieved January 10, 2008, from http://office.microsoft.com/en-us/clipart/default.aspx

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