Post on 19-Jan-2016
Simple Machines
Group I I
Wedge
Chelsea Trout
Explanation of a Wedge
The wedge is a simple machine shaped like an incline.
It is like a moving incline plane standing on its narrow end.
A weak force on the wide end being pushed into something, will send a stronger force pushing out the sides.
Mechanical Advantage
The mechanical advantage of a wedge can be found by dividing the length by the width.
The equation is: Length/Width
Changing the Force The wedge changes the force by splitting
the object apart.
Compound Machines with Wedges
Snow blower Wheel and axle Wedge
Pencil Sharpener Wheel and axle Wedge
Scissors Axle Wedge Lever
Bibliography
http://library.thinkquest.org/J002079F/wedge.htm
http://www.uark.edu/depts/aeedhp/agscience/simpmach.htm
http://www.juniorengineering.usu.edu/workshops/machines/machines.php
http://www.cksinfo.com/clipart/construction/tools/scissors/scissors-2.png
http://www.utm.edu/departments/cece/old_site/seventh/ph751a1.htm
Screw
By: Haylie MountPd.11
Simple Machine
Screw
According to wikipedia a screw is a shaft with a helical groove or thread formed on its surface and provision at one end to turn the screw. Its main uses are as a threaded fastener used to hold objects
together, and as a simple machine used to translate torque into linear force. It can
also be defined as an inclined plane wrapped around a shaft.
http://en.wikipedia.org/wiki/Screw
Mechanical Advantage of a Screw
The mechanical advantage of a screw can be found by dividing the circumference of the screw by the pitch of the screw.
Mechanical Advantage= Circumference
Pitch
ExampleFor example, suppose a screw with 12 threads per inch is turned by a screwdriver having a handle with a diameter of 1 inch. The mechanical
advantage would be calculated as follows: First, determine the pitch of the screw...
Pitch = 1 = 1 = .083 12 threads/inch of screw 12
Second, determine the circumference of the handle of the screwdriver...
Circumference = 3.14 x diameter = 3.14 x 1 = 3.14 inches
Finally, insert the values obtained into the formula and solve the equation...
Mechanical Advantage = Circumference = 3.14 inches = 37.83 Pitch .083
Compound Machine
• Post digger-Screw
-Lever
-Puller
-Gear
• Snow Blower-Screw
-Pulley
-Lever
-Wheel and Axel
-Wedge
Bibliography
http://www.uark.edu/depts/aeedhp/agscience/simpmach.htm
I used this web site for Mechanical Advantage of a Screw.
http://en.wikipedia.org/wiki/Screw
I used this website for the definition of a screw.
http://www.edheads.org/activities/simple-machines/
I used this site as a reference for simple and compound machines.
http://dic.academic.ru/dic.nsf/cide/36960/Compound
http://teacher.scholastic.com/dirtrep/simple/screw.htm
Kristine BentzKristine Bentz
PhysicsPhysics
Period 11Period 11
What is a Pulley?What is a Pulley? A simple machine that is composed of a wheel and groove between A simple machine that is composed of a wheel and groove between
two flanges of around the wheels circumference.two flanges of around the wheels circumference.• www.wikipedia.comwww.wikipedia.com
3 types3 types
A FIXED PULLEYA FIXED PULLEY A MOVABLE PULLEYA MOVABLE PULLEY
A COMBINED PULLEYA COMBINED PULLEY
http://www.the-office.com/summerlift/pulleybasics.htm
ADVANTAGESADVANTAGES
Changes the direction of the pull.Changes the direction of the pull. Lift heavy loadsLift heavy loads
For a bicycle it turns the chainSo that the bike can function.
www.automata.co.uk/pulleys.htm
CHANGE IN FORCECHANGE IN FORCE
LeverLever
Chris SeamanChris Seaman
LeverLever
It is a object with the right size It is a object with the right size fulcrum or pivot. In return it fulcrum or pivot. In return it multiples the mechanical force that multiples the mechanical force that can be used to move a different object.can be used to move a different object.
Mechanical advantage of a lever is Mechanical advantage of a lever is that it puts out more leverage then that it puts out more leverage then what you put in. what you put in. The Mechanical advantage formula is the The Mechanical advantage formula is the
length of arm effort/length of load arm. length of arm effort/length of load arm.
LeverLever
There are three different kinds of There are three different kinds of levers.levers. First class leversFirst class levers
Examples: Seesaw, Crow bar, Hammer claw, Examples: Seesaw, Crow bar, Hammer claw, Hand trucks, and a shoehorn are just a Hand trucks, and a shoehorn are just a couple of examples.couple of examples.
LeversLevers
Second class leversSecond class levers The work put in is a one end of the lever The work put in is a one end of the lever
and at the other end is the Fulcrum. and at the other end is the Fulcrum. And the load is in between the two ends And the load is in between the two ends of the lever.of the lever.
Examples: Wrenches, Nutcrackers, Examples: Wrenches, Nutcrackers, Wheelbarrow.Wheelbarrow.
LeversLevers
Third class levers.Third class levers. The input force is greater then output The input force is greater then output
force. The load move more then the force. The load move more then the distance moved by effort. distance moved by effort.
ExamplesExamples BroomBroom Fishing rodFishing rod Mouse trap Mouse trap
Lever ProblemLever Problem
There is a wheelbarrow that is 4 foot There is a wheelbarrow that is 4 foot long. And the load arm is 2 foot long. long. And the load arm is 2 foot long. What is the mechanical advantage of What is the mechanical advantage of the wheelbarrow?the wheelbarrow?
Effort arm is 4 foot, load arm is 2 Effort arm is 4 foot, load arm is 2 food.food.
4/2= 24/2= 2 So the mechanical advantage is 2. So the mechanical advantage is 2.
COMPOUND MACHINE 1COMPOUND MACHINE 1
A Crane.A Crane. Lever Lever Wheel and axleWheel and axle PulleyPulley ScrewsScrews
Compound Machine 2Compound Machine 2
CarsCars Simple machines on it.Simple machines on it.
Wheel and AxleWheel and Axle LeverLever ScrewsScrews
Compound Machine 3Compound Machine 3
BikesBikes Simple Machines in a bike.Simple Machines in a bike.
LeversLevers Wheel and axlesWheel and axles ScrewsScrews
BibliographyBibliography
1.1.http://wiki.answers.com/Q/What_is_thttp://wiki.answers.com/Q/What_is_the_equation_to_find_the_mechanicalhe_equation_to_find_the_mechanical_advantage_of_a_lever_advantage_of_a_lever (Used to find the mechanical (Used to find the mechanical advantage of a lever.)advantage of a lever.)
2.http://www.dynamicscience.com.au/2.http://www.dynamicscience.com.au/tester/solutions/hydraulicus/tester/solutions/hydraulicus/simplemachineslevers7.htm (Used to simplemachineslevers7.htm (Used to find info on levers and pictures)find info on levers and pictures)
3.http://en.wikipedia.org/wiki/Lever (Used 3.http://en.wikipedia.org/wiki/Lever (Used to get the information on levers)to get the information on levers)
BibliographyBibliography
4.http://www.enchantedlearning.com/4.http://www.enchantedlearning.com/physics/machines/Levers.shtmlphysics/machines/Levers.shtml
5.http://www.uark.edu/depts/aeedhp/5.http://www.uark.edu/depts/aeedhp/agscience/simpmach.htmagscience/simpmach.htm
Nick ManzaPeriod 11
What is an Inclined Plane?
An inclined plane is a ramp that is used to reduce effort that is used to raise or lower an object.
Some examples of a inclined plane are…– Loading ramp– Mountain Road– Or even a threaded screw
Examples
Mechanical Advantage
The mechanical advantage of an inclined plane is the length of the slope divided by the height of the plane.
Mechanical Advantage=S/H
How does an Inclined Plane change the Force?
The Force in an inclined plane can change in 2 ways. Depending on which way it is going. It could make it easier or harder to push an object.
Finding Mechanical Advantage
One example of finding mechanical advantage is if the slope of an inclined plane equaled 10, and the height of the plane equaled 2. Since S/H=MA the answer would be 5.
Compound Machine #1
This is a compound machine that has 3 simples machines in it.
– A lever.– A pulley.– And an inclined plane.
Compound Machine #2
This compound machine drives away.
– It has a wheel and axle.– It has a pulley.– The inclined planes on it
are screws.
Compound Machine #3
This is a puller swinger, that you can use to lift things.
– It has a wheel an axle.– It has a lever.– It has a pulley– It also has an inclined
plane.
Bibliography
http://www.professorbeaker.com/plane_fact.html - Gave me a clear understanding of the definition. Used
http://images.google.com/imgres?imgurl=http://www.beth.k12.pa.us/schools/wwwclass/mcosgrove/simplemachines.gif&imgrefurl=http://www.beth.k12.pa.us/schools/wwwclass/mcosgrove/simple.htm&usg=__k9eWnzj_ZMbmQwdiFb6g2a7rmI4=&h=300&w=502&sz=37&hl=en&start=36&tbnid=H4CyEPktznCbzM:&tbnh=78&tbnw=130&prev=/images%3Fq%3Dcompound%2Bmachine%2Busing%2Bincline%26start%3D20%26gbv%3D2%26ndsp%3D20%26hl%3Den%26safe%3Dactive%26sa%3DN – pictures on slide 3 USED
http://images.google.com/imgres?imgurl=http://www.richland.k12.wi.us/RMS/RMS%2520Web%2520Page/RMS6/Bauss/BauerWeb/images/machine2a.jpg&imgrefurl=http://www.richland.k12.wi.us/RMS/RMS%2520Web%2520Page/RMS6/Bauss/BauerWeb/studentwork.html&usg=__S8q40WSNMcq3ZX9oeq-JgOIx-z0=&h=203&w=216&sz=18&hl=en&start=28&um=1&tbnid=KgkIcpbed-jCTM:&tbnh=101&tbnw=107&prev=/images%3Fq%3Dinclined%2Bplane%2Bcompound%2Bmachine%26ndsp%3D18%26hl%3Den%26safe%3Dactive%26sa%3DN%26start%3D18%26um%3D1 – used for compound machines 2 and 3
http://www.uark.edu/depts/aeedhp/agscience/simpmach.htm - mechanical advantage USED
http://images.google.com/imgres?imgurl=http://www.richland.k12.wi.us/RMS/RMS%2520Web%2520Page/RMS6/BauSS/BauerWeb/images/machine2a.jpg&imgrefurl=http://www.richland.k12.wi.us/RMS/RMS%2520Web%2520Page/RMS6/BauSS/BauerWeb/portfolio/studentwork.html&usg=__NjacKnMgMlfOh2mmdjBCUxao80=&h=203&w=216&sz=18&hl=en&start=28&um=1&tbnid=KgkIcpbedjCTM:&tbnh=101&tbnw=107&prev=/images%3Fq%3Dcompound%2Bmachine%2Bwith%2Binclined%2Bplanes%26ndsp%3D18%26hl%3Den%26safe%3Dactive%26sa%3DN%26start%3D18%26um%3D1 – USED for Compound machine 1
•Wheel and Axle is 1 of the 6 different types of simple machines.
•It is a wheel with a rod, called a axle, through its center. Used to move or lift loads.
•The mechanical advantage of a wheel and axle is the ratio of the wheel radius to the axle radius.
•The wheel and axle can be used also for an increased speed for doing a certain task.
•The mechanical advantage equation:
MA=radius of wheel/radius of axle
An example of a mechanical advantage for a wheel and axle would be a windlass.If the radius of the axle is 2 cm and the radius of the wheel is 12 cm. Then the radius of the wheel is therefore 6 times larger than the axle radius. So the actual mechanical advantage would be 6:1.
~Bicycle~
•Wheel and axle
•Pulley
•Lever
•screw
~Car~
•Wheel and axle
•Pulley
•Lever
•screw
~Wheel barrel~
•Wheel and axle
•Lever
•Screw
• http://www.mikids.com/Smachines.htm
-used to find the definition of the wheel and axle.
•http://www.cosi.org/files/Flash/simpMach/sm1.swf
-used to find the mechanical advantages
•http://en.wikipedia.org/wiki/Wheel_and_axle
•http://www.uark.edu/depts/aeedhp/agscience/simpmach.htm
•http://wiki.answers.com/Q/Mechanical_advantage_of_a_wheel_and_axle
-mechanical advantage equation