Rosa Ruiz Diaz & Wanda Valdez Brooklyn College Fall 2008.
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Transcript of Rosa Ruiz Diaz & Wanda Valdez Brooklyn College Fall 2008.
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SIMPLE MACHINES
Rosa Ruiz Diaz & Wanda ValdezBrooklyn CollegeFall 2008
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WHAT IS A SIMPLE MACHINE
Is a mechanical device that helps us do work by helping us move things easier, faster or father. A simple machine has few or no moving parts.
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TYPES OF SIMPLE MACHINES
Simple machines are grouped into six types:
1. Lever
2. Inclined Plane3. Wheel and Axle4. Screw 5. Wedge6. Pulley
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ENERGY AND WORK
Simple machines are tools that use energy to do work.
Energy is the ability to do work.
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WHAT IS A LEVER?
A rigid bar that rotates on a pivot called a fulcrum.
All levers have four parts:1. A rigid bar, called the arm.2. The fulcrum, or support around which the
arms pivot.3. The load, which is the object to be moved.
4. The effort, or force that is applied to move the load.
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THERE ARE THREE CLASSES OF LEVERS
1. First Class Lever. 2. Second Class Lever. 3. Third Class Lever.
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FIRST CLASS LEVER
●In a first class lever the fulcrum is in the middle and the load and effort is on either side.●Think of a see-saw.
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SECOND CLASS LEVER
In a second class lever the fulcrum is at the end, with the load in the middle.
Think of a wheelbarrow.
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THIRD CLASS LEVER
In a third class lever the fulcrum is again at the end, but the effort is in the middle
Think of a pair of tweezers
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INCLINED PLANE
An inclined plane is a flat surface that is higher on one end
Inclined planes make the work of moving things easier
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WHEEL AND AXLE
A wheel and axle is a simple machine made of a rod attached to the center of a wheel.
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SCREW
A screw is an inclined plane wrapped around a shaft or cylinder.
The inclined plane allows the screw to move itself when rotated.
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WEDGE
Two inclined planes joined back to back.
Wedges are used to split things.
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PULLEY
A pulley is a circular lever that consists of a grooved wheel rotating about a hub.
A pulley needs a rope, chain or belt around the groove to make it do work.
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COMPOUND MACHINES
It a combination of simple machines that work together.
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SEARCH FOR SIMPLE MACHINES
Do you think that you are ready to take a quiz on your filamentality website?
Let’s see http://www.teachersdomain.org/collection/k12/
sci.phys.energy.work/
http://www.youtube.com/watch?v=72zNEactb-k http://www.edheads.org/activities/simple-machines/ Or http://www.quia.com/quiz/110999.html?AP_rand=1051613213
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FILAMENTALITY
http://www.kn.att.com/wired/fil/pages/listamazingwa1.html
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IDENTIFYING SIMPLE MACHINES
NSF North Mississippi GK-8
Inclined plane Wheel and axel Wedge
Screw Pulley Inclined plane
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DO YOU KNOW THAT SIMPLE MACHINES ARE IMPORTANT TO US IN OUR DAILY LIFE?
They help us do work. They make our lives easier. Let’s see how many times we use
simple machines in our lives.
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THIS IS OUR RESULT
blender scissors bicycle sharpener0
1
2
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7
0
1
0
6
morningafternoonevening
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SOURCES
Mikids.com. 2006. Simple Machines. Accessed 2 February 2006. http://www.mikids.com/Smachines.htm
Wikepedia. Accessed 3 February 2006.
http://en.wikipedia.org/wiki/Mechanicaladvantage