# Simple Machines Group KK. Screw Derek Eisenberg What is a screw?  A screw is one of the six simple machines.  Definition- a mechanical device for fixing.

## Presentation on theme: "Simple Machines Group KK. Screw Derek Eisenberg What is a screw?  A screw is one of the six simple machines.  Definition- a mechanical device for fixing."— Presentation transcript:

Simple Machines Group KK

Screw Derek Eisenberg

What is a screw?  A screw is one of the six simple machines.  Definition- a mechanical device for fixing one object to another  The screw is really an inclined plane in the round with a wedge at the tip. Think of a typical screw. The wedge is the pointed end. The inclined plane is the thread that wraps around the screw. Screws are used in many different places to hold things together.

Advantage  There are many advantages of using screws. Here is an equation:  F1 X D1=F2 X D2

Bibliography  www.wikipedia.org www.wikipedia.org  www.Uark.edu www.Uark.edu  www.hyperphysics.phy/astr.gsu.edu www.hyperphysics.phy/astr.gsu.edu  www.teacher.scholastic.com www.teacher.scholastic.com  www.roymech.co.uk www.roymech.co.uk

Lever

Levers are one of the basic tools that were probably used in prehistoric times. Levers were first described about 260 BC by the ancient Greek mathematician Archimedes (287-212 BC). A lever is a simple machine that makes work easier for use; it involves moving a load around a pivot using a force. Many of our basic tools use levers, including scissors (2 class 1 levers), pliers (2 class 1 levers), hammer claws (a single class 2 lever), nut crackers (2 class 2 levers), and tongs (2 class 3 levers).

Class 1 Levers In a Type 1 Lever, the pivot is between the effort and the load. In an off-center type one lever (like a pliers), the load is larger than the effort, but is moved through a smaller distance.

Class 2 Levers In a Type 2 Lever, the load is between the pivot and the effort.

Class 3 Levers In a Type 3 Lever, the effort is between the pivot (fulcrum) and the load.

Bibliography http://www.uark.edu/depts/aeedhp/agscien ce/simpmach.htm http://www.enchantedlearning.com/physics /machines/Levers.shtml http://www.wikipedia.org http://teacher.scholastic.com/dirtrep/simple /lever.htm http://library.thinkquest.org/CR0210120/lev er.html

Wheel and Axle Aaron Boyer Period 12

Simple Machine

Simple Wheel Common, everyday objects make good use of the wheel and axle, as seen in this contraption. Common, everyday objects make good use of the wheel and axle, as seen in this contraption. The sole use of the wheel in this picture is to smoothly move the object on which the wheels are attached to. The sole use of the wheel in this picture is to smoothly move the object on which the wheels are attached to.

Compound Machines Three Common Uses of the Wheel and Axle in Compound Machines

Water Wheel The water wheel is a simple device that makes use of a wheel and axle. The water wheel is a simple device that makes use of a wheel and axle. When the wheel is turned, the axel spins and winds up the rope carrying the bucket of water. When the wheel is turned, the axel spins and winds up the rope carrying the bucket of water. Some also use flowing water to power objects, as seen in this image. Some also use flowing water to power objects, as seen in this image.

Bicycle The bicycle makes use of two wheels and axles in order to move the machine over various forms of terrain. The bicycle makes use of two wheels and axles in order to move the machine over various forms of terrain. Larger wheels provide more traction for the bicycle. Larger wheels provide more traction for the bicycle.

Steering Wheel The steering wheel is a device that makes practical use of the wheel and axle to steer motor vehicles. The steering wheel is a device that makes practical use of the wheel and axle to steer motor vehicles. When one turns the steering wheel, the axle rotates, changing the direction the wheels face. This causes the vehicle to move in the desired direction, providing the driver with control. When one turns the steering wheel, the axle rotates, changing the direction the wheels face. This causes the vehicle to move in the desired direction, providing the driver with control.

Wedge By: Amber Hastings

A wedge is… A wedge is a triangular shaped simple machine in the shape of an incline plane.

The Ideal Mechanical Advantage To find the ideal mechanical advantage you take the ratio to its length to the ratio to its width. The equation would be MA=l/w (length by width)

Changing Forces The wedge converts the force put on its blunt end into forces perpendicular to its length. For instance when you use a wedge to split wood, the force that is put on it from the axe is changed into the force that causes the wood to split.

MA Example Ma=l/w 8/4=2

Compound Machines A fan would be one example of a compound machine. The fan blade is an example of a wedge and there is also a wheel and axle in it.

A Row Boat A row boat is an example of a compound machine. The wedge would be the front of the boat. It slices through the water causing less resistance. The other simple machines in a boat are the oars. They serve as levers.

Rocket The scooper on the shovel serves as the wedge and the handle serves as the lever.

Autobiography http://library.thinkquest.org/CR0210120/Compou nd%20machine.htmlhttp://library.thinkquest.org/CR0210120/Compou nd%20machine.html http://en.wikipedia.org/wiki/Wedge_(mechanical _device)http://en.wikipedia.org/wiki/Wedge_(mechanical _device) http://www.usoe.k12.ut.us/curr/science/sciber00/ 8th/machines/sciber/machine3.htmhttp://www.usoe.k12.ut.us/curr/science/sciber00/ 8th/machines/sciber/machine3.htm http://www.edheads.org/activities/simple- machines/ http://www.coe.uh.edu/archive/science/science_l essons/scienceles1/finalhome.htm

The Inclined Plane By Wade Meyerhoffer

What is it?  The inclined plane is a plane surface set at an angle, other than a right angle, against a horizontal surface. The inclined plane permits one to overcome a large resistance by applying a relatively small force through a longer distance than the load is to be raised.

Equations  The ideal advantage of the inclined plane is to get things to a higher level easier than carrying it.  F(parallel)=sinθ*w  F(perpendicular)=cos θ*w

Compound Machines(1)  Ski lift  Uses both inclined plane and a pulley system

Compound Machines(2)  Trolley  Inclined Plane and wheel and axle

Compound Machine(3)  Roller Coaster  Pulley and inclined plane

Works Cited  http://www.weirdrichard.com/inclined.htm http://www.weirdrichard.com/inclined.htm  http://teacher.scholastic.com/dirtrep/Simple/pl ane.htm http://teacher.scholastic.com/dirtrep/Simple/pl ane.htm http://teacher.scholastic.com/dirtrep/Simple/pl ane.htm  http://www.phy.hk/wiki/englishhtm/Incline.ht m http://www.phy.hk/wiki/englishhtm/Incline.ht m http://www.phy.hk/wiki/englishhtm/Incline.ht m  http://illuminations.nctm.org/LessonDetail.asp x?id=L278 http://illuminations.nctm.org/LessonDetail.asp x?id=L278 http://illuminations.nctm.org/LessonDetail.asp x?id=L278  http://www.mikids.com/SMachinesInclinedPla nes.htm http://www.mikids.com/SMachinesInclinedPla nes.htm http://www.mikids.com/SMachinesInclinedPla nes.htm

The Pulley Katie Haldeman

Explination A pulley is a mechanism that is made up of a wheel with a groove and a rope that runs inside the groove The pulley is used to change the direction of applied force

Mechanical Advantage The ideal mechanical advantage of a machine is the ratio of the output and input forces that are used within the machine For pulleys, the output force is the weight of the object being lifted and the input force is the force applied on the end of the rope Finding the actual mechanical advantage is possible when friction is involved N(1/2) N=number of ropes, minus the one in your hand

Change in force The pulley changes the force in reducing and redirecting the weight to make it more simple and lighter to use and lift.

Mechanical advantage example N(1/2) N stands the total amount of ropes, minus the one in your hand If you are using 3 ropes, minus the one in your hand, use the equation N(1/2) …So 2(1/2) which is 1

Bicycle The pulley on the bicycle is the chain that helps rotate the tires. The wheel and axel on the bike helps the tires move as one machine

Trebuchet The trebuchet is a compound machine, with the pulley acting to make the load easier The lever is used to launch The wedge is used to hold the trebuchet together

Ski Lift A ski lift is a compound machine. It uses a pulley, inclined plane and also a wedge.

bibliography http://en.wikipedia.org/wiki/Pulley http://www.swe.org/iac/lp/pulley_03.html http://library.thinkquest.org/27948/pulley.ht ml http://www.swe.org/iac/lp/pulley_03.html http://cnx.org/content/m14060/latest/ http://www.howstuffworks.com/pulley.htm

Download ppt "Simple Machines Group KK. Screw Derek Eisenberg What is a screw?  A screw is one of the six simple machines.  Definition- a mechanical device for fixing."

Similar presentations