Simple Machines

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# Simple Machines - PowerPoint PPT Presentation

Simple Machines. Group HH. Inclines. By: DJ Dinnison. What Is an Incline?. An inclined plane is a simple machine.  It is a flat surface that is higher on one end.  You can use this machine to move an object to a lower or higher place.

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Presentation Transcript

Group HH

### Inclines

By: DJ Dinnison

What Is an Incline?
• An inclined plane is a simple machine.  It is a flat surface that is higher on one end.
• You can use this machine to move an object to a lower or higher place.
• Inclined planes make the work of moving things easier.
• You would need less energy and force to move objects with an inclined plane.
Compound Machine #1
• 1.) Wheel barrow –
• The bucket in the wheelbarrow is the inclined plane.
• The wheel is the wheel and axel.
• The handle is used as the lever to move the wheel barrow.
Compound Machine #2
• Rollercoaster- A rollercoaster has 3 simple machines.
• A rollercoaster inclines up hills to gain speed.
• A pulley is used for it to incline up the hill.
• Wheel and axel is used for the cars to ride on the tracks.
Compound Machine #3
• Ramp- A ramp has two simple machines an inclined plane and a screw.
• The inclined plane is the most important for a ramp.
• A screw is also used in a ramp to keep the ramp intact.
• MECHANICAL ADVANTAGE OF THE INCLINED PLANE
• If an object is put on an inclined plane it will move if the force of friction is smaller than the combined force of gravity and normal force. If the angle of the inclined plane is 90 degrees (rectangle) the object will free fall.
Bibliography
• 1.)http://www.edinformatics.com/math_science/simple_machines/inclined_plane.htm
• I used this site, to find my mechanical advantage for my inclined plane.

I used this site to find compound machines that included simple machines.

3.)http://www.coe.uh.edu/archive/science/science_lessons/scienceles1/finalhome.htm

I used this site to find information on my simple machine and figure out its use and function.

### Wedges

By: Anthony Appelt

What is a wedge?
• A wedge is a moveable incline plane.
• Wedges are used as holding or separating devices.
• A wedge is composed of one or two inclined planes.
Some examples of a wedge
• Chisels
• Axe
• Floor nails
How is it used?
• It changes the magnitude or direction of the force.
• The mechanical advantage of a wedge can be found by dividing the length of either slope (S) by the thickness (T) of the big end.
• It changes the force by having a more acute angle of a wedge.

Example:

assume that the length of the slope is 10 inches and the thickness is 4 inches. The mechanical advantage is equal to 10/4 or 2 1/2.

MA = L / W

Compound Machine #1

Snowblower- uses levers, pulleys, screw, wedge, incline plane, wheel and axel.

It uses the wedge as the blades inside.

Compound Machine #2

Shovel – it uses a wedge and lever

The shovel wedges itself in the ground and you push on the lever to push dirt up.

Compound machine #3

Scissors- wedge and a lever

The scissors wedge the item their trying to cut.

Bibliography
• http://www.mikids.com/Smachines.htm
• http://science.jrank.org/pages/4060/Machines-Simple.html
• http://www.uark.edu/depts/aeedhp/agscience/simpmach.htm
• www.teachengineering.org
• www.utm.edu/departments/ed/cece/seventh/Ph751a1.htm - 19k

### LEVERS!!

By Jarred Binner

A lever is a rigid object that is used with a pivot point to multiply the mechanical force that can be applied to another object. This leverage is also termed mechanical advantage, and is one example of the principle of moments.
Levers can be used to exert a large force over a small distance at one end by exerting only a small force over a greater distance at the
Principle of Levers
• The principle of leverage can be used from Newton\'s laws of motion. It is important to know that the amount of work done is( force x distance). To make a lever lift a certain amount of weight with a force of half a unit, the distance from the pivot point to the spot where force is applied must be twice the distance between the weight and the pivot. For example, to cut the force in half, you are required to lift a weight resting 1 meter from the pivot, we would need to apply force 2 meters from the other side of the pivot. The amount of work done is always the same as the dimensions of the lever. The lever only lets force be the same as distance
• The point where you apply the force is called the effort. The effect of applying this force is called the load. The load arm and the effort arm are the names given to the distances from the pivot point to the load and effort.
WheelBarrel
• Uses wheel and axle, lever, and a inclined slope.
Miter Saw
• Uses a lever, a gear, and a pulley
Bibliography
• www.wikipedia.com
• www.enchantedlearning.com
• Library.thinkquest.org
• www.grc.nasa.gov

### ScrewBY Dustin Bowen

screw
• is a shaft with a helical groove or, thread formed on its surface and provision at one end to turn the screw. Its used as a threaded fastener to hold an object together, and as a simple machine it is used for translate torque into linear force. It can also be defined as an inclined plane wrapped around a shaft.
Lead screws and ball screw are specialized screws for translating rotational to linear motion.
• Automated garage doors, where a motor drives a long finely threaded shaft at relatively high speed and lifts the heavy door at a slower rate.
• Archimedes\' screw and worm gears are examples of this machine.
Compound machine #1
• Corkscrew is a Compound machine because it use a screw and a lever
Compound machine #2

snow blower use a screw, wheel, pulley, wedge and a lever

Compound machine #3
• Pencilsharpener use a wedge a wheel and a lever
http://en.wikipedia.org/wiki/Screw -wikipedia got info about what a screw is and who it is a simple machine
• http://www.edheads.org/activities/simple-machines/ - basic information and pictures
• http://www.beth.k12.pa.us/schools/wwwclass/mcosgrove/simple.htm - basic information on simple machine and compound

Damanjeet Gill

Physics, Pd: 11

Definition

• A wheel & Axle is a simple machine, in which a larger wheel is attached around a smaller wheel, which will be the axle.
• The outside which is a wheel, rotates around a smaller center point or fulcrum, axle.
• Examples of Wheel & Axle are Ferris Wheels, bikes, and gears, etc.

How To Use a Wheel & Axle

• Two key ways to use a wheel and axle:
• The first is by covering a rope around a supported wheel with a lever sticking out. An object can be tied to the other end. When the lever is turned, the rope either moves the object near or away from you.
• The second is by putting two wheels at the end of an axle. The wheels will then give motion by rolling.

How a Wheel & Axle Works

The wheel & axle can be used as a tool to increase the force one applies, or to increase the distance traveled.

Here is how this works:

One applies a force on the wheel, whose diameter D is larger than the axle.The force is transmitted to the axle, which has diameter d.This resultant force, that is greater than the force one applied, does some work for that person.The force that does the work is Greater by an aspect of D/d.

Changing the Force

• A wheel and axle can be used to lift heavy objects like a bucket of water. A somewhat small force applied to the large wheel can lift a weight hanging from the small axle. Thus the wheel and axle act like a first class lever with the fulcrum between the applied force and the load.
• For the wheel and axle, this is equal to the
• proportion of the radii (R/r).
• For instance, if the radius of a crank is 10 times the radius of an axle, the mechanical gain is 10, and an object can be lifted which is 10 times as heavy as the applied force.

Wheelbarrow

• Wheel and Axle
• Lever
• Inclined Plane

Wheel and Axle

• Pulley

Crane

Door Latch

• Wheel & Axle
• Screw

Bibliography

• http://www.engineersaustralia.org.au/careers/engquest-2008/students-lower-sm.cfm
• Diagrams of examples, background information
• http://library.thinkquest.org/CR0210120/wheel%20and%20axle.html
• The Wacky Wheel & Axle: How to work the simple machine
• http://www.worsleyschool.net/science/files/wheel/andaxle.html
• The Wheel and Axle: Mechanical advantages, equations, and animations
• http://www.usoe.k12.ut.us/curr/science/sciber00/8th/machines/sciber/machine7.htm
• Basic information, and pictures
• http://www.mikids.com/SMachinesWheels.htm
• Mikids.com : Examples of wheels and axles
• * Used All The Above Sites
A pulley is a simple machine that consist of a grooved wheel that turns freely in a block.
• A rope, cable, or a belt are what run through the grooved wheel.
• There are two different types of pulley systems.
• Fixed pulley doesn’t lessen the weight it changes the direction of the force
• Moveable pulley provides a mechanical advantage, but doesn’t change the direction.
• A fixed pulley has no mechanical advantage, but it does change the direction force needs to be applied.
• A moveable pulley creates a mechanical advantage but doesn’t change the direction of force.

Moveable pulley

A flag pole is a good example of a fixed pulley, because the block never move and the pulley doesn’t give a mechanical advantage, but it does change the direction of the force.
Compound Machine
• This compound machine is made up of three fixed and two moveable
• If you take the weight divided by the number of ropes minus one.
• W / (R-1)= F
Compound Machine Con’t
• A crane is a compound machine that consist of a pulley and wheel and axle.
Compound Machine Con’t
• Garage door is another example of a compound machine. It uses a pulley to open the door, and it uses wheels and axles to keep it on its tracks.
Bibliography
• www.wikipedia.com
• www.miniscience.com
• www.uark.edu
• www.dynamicscience.com
• www.edinformatics.com