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  edge.htm edge.htm  ience/simpmach.htm ience/simpmach.htm  orkshops/machines/machines.php orkshops/machines/machines.php  ion/tools/scissors/scissors-2.png ion/tools/scissors/scissors-2.png  old_site/seventh/ph751a1.htm old_site/seventh/ph751a1.htm

Screw By: Haylie Mount Pd.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.

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

Example For 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 = 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 = Pitch.083

Compound Machine

Power Drill -Screw -Gear -Lever

Post digger -Screw -Lever -Puller -Gear

Snow Blower -Screw -Pulley -Lever -Wheel and Axel -Wedge

Bibliography I used this web site for Mechanical Advantage of a Screw. I used this website for the definition of a screw. I used this site as a reference for simple and compound machines.

Kristine Bentz Physics Period 11

What is a Pulley?  A simple machine that is composed of a wheel and groove between two flanges of around the wheels circumference.

3 types  A FIXED PULLEY A MOVABLE PULLEY A COMBINED PULLEY

ADVANTAGES Changes the direction of the pull. Changes the direction of the pull. Lift heavy loads Lift heavy loads For a bicycle it turns the chain So that the bike can function.

CHANGE IN FORCE

Lever Chris Seaman

Lever It is a object with the right size fulcrum or pivot. In return it multiples the mechanical force that can be used to move a different object. It is a object with the right size fulcrum or pivot. In return it multiples the mechanical force that can be used to move a different object. Mechanical advantage of a lever is that it puts out more leverage then what you put in. Mechanical advantage of a lever is that it puts out more leverage then what you put in. The Mechanical advantage formula is the length of arm effort/length of load arm. The Mechanical advantage formula is the length of arm effort/length of load arm.

Lever There are three different kinds of levers. There are three different kinds of levers. First class levers First class levers Examples: Seesaw, Crow bar, Hammer claw, Hand trucks, and a shoehorn are just a couple of examples. Examples: Seesaw, Crow bar, Hammer claw, Hand trucks, and a shoehorn are just a couple of examples.

Levers Second class levers Second class levers The work put in is a one end of the lever and at the other end is the Fulcrum. And the load is in between the two ends of the lever. The work put in is a one end of the lever and at the other end is the Fulcrum. And the load is in between the two ends of the lever. Examples: Wrenches, Nutcrackers, Wheelbarrow. Examples: Wrenches, Nutcrackers, Wheelbarrow.

Levers Third class levers. Third class levers. The input force is greater then output force. The load move more then the distance moved by effort. The input force is greater then output force. The load move more then the distance moved by effort. Examples Examples Broom Broom Fishing rod Fishing rod Mouse trap Mouse trap

Lever Problem There is a wheelbarrow that is 4 foot long. And the load arm is 2 foot long. What is the mechanical advantage of the wheelbarrow? There is a wheelbarrow that is 4 foot long. And the load arm is 2 foot long. What is the mechanical advantage of the wheelbarrow? Effort arm is 4 foot, load arm is 2 food. Effort arm is 4 foot, load arm is 2 food. 4/2= 2 4/2= 2 So the mechanical advantage is 2. So the mechanical advantage is 2.

COMPOUND MACHINE 1 A Crane. A Crane. Lever Lever Wheel and axle Wheel and axle Pulley Pulley Screws Screws

Compound Machine 2 Cars Cars Simple machines on it. Simple machines on it. Wheel and Axle Wheel and Axle Lever Lever Screws Screws

Compound Machine 3 Bikes Bikes Simple Machines in a bike. Simple Machines in a bike. Levers Levers Wheel and axles Wheel and axles Screws Screws

Bibliography 1. ion_to_find_the_mechanical_advantage_of_a_ lever (Used to find the mechanical advantage of a lever.) ion_to_find_the_mechanical_advantage_of_a_ leverhttp://wiki.answers.com/Q/What_is_the_equat ion_to_find_the_mechanical_advantage_of_a_ lever 2. s/hydraulicus/simplemachineslevers7.htm (Used to find info on levers and pictures) 3. (Used to get the information on levers)

Bibliography 4. chines/Levers.shtml 5. simpmach.htm

Nick Manza Period 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–A lever. –A–A pulley. –A–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 - Gave me a clear understanding of the definition. Used a.us/schools/wwwclass/mcosgrove/simplemachines.gif&imgrefu rl= ple.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 %2520Page/RMS6/Bauss/BauerWeb/images/m achine2a.jpg&imgrefurl= /Bauss/BauerWeb/studentwork.html&usg=__S8 q40WSNMcq3ZX9oeq-JgOIx- z0=&h=203&w=216&sz=18&hl=en&start=28&u m=1&tbnid=KgkIcpbed- jCTM:&tbnh=101&tbnw=107&prev=/images%3F q%3Dinclined%2Bplane%2Bcompound%2Bma chine%26ndsp%3D18%26hl%3Den%26safe%3 Dactive%26sa%3DN%26start%3D18%26um%3 D1 – used for compound machines 2 and 3D18%26um%3 D1 - mechanical advantage USED wi.us/RMS/RMS%2520Web%2520Page/RMS6/BauSS/Bauer Web/images/machine2a.jpg&imgrefurl= wi.us/RMS/RMS%2520Web%2520Page/RMS6/BauSS/BauerW eb/portfolio/studentwork.html&usg=__NjacKnMgMlfOh2mmdjB CUxao80=&h=203&w=216&sz=18&hl=en&start=28&um=1&tbni d=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 126um%3D1

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

-used to find the definition of the wheel and axle. -used to find the mechanical advantages _wheel_and_axlehttp://wiki.answers.com/Q/Mechanical_advantage_of_a _wheel_and_axle -mechanical advantage equation