machinesscmiddlescience.weebly.com/uploads/8/3/4/5/83458224/notes-_mac… · machines machines are...

MACHINES

MACHINES

Machines are devices that make work easier.

Machines make work easier by decreasing or

redirecting the force applied.

Machines do not reduce the amount of work;

they decrease the amount of effort needed.

http://www.goodway.com/downloads/product_images/high/gfm-bp-20.jpg

http://www.fi.edu/qa97/spotlight3/spotlight3.html

LEVER

A bar that is free to pivot around a fixed point or

fulcrum.

http://www.lindamoran.net/images/seesaw.jpg

http://www.explainthatstuff.com/wheelbarrow2.png

CLASSES OF LEVERS

PULLEYS

A grooved wheel with a rope, chain or cable

that changes the direction of the force.

http://images.google.com/imgres?imgurl=http://www.dkimages.com/discover/previews/976/55019835.JPG&imgrefurl=http://www.dkimages.com/discover/Home/Technology/Tools-Machines-Instruments/Simple-Machines/Pulleys/Pulleys-10.html&h=680&w=512&sz=25&hl=en&start=9&tbnid=Ee9FOQykEpFL8M:&tbnh=139&tbnw=105&prev=/images%3Fq%3Dpulley%26gbv%3D2%26hl%3Den

http://www.sciencebuddies.org/mentoring/project_ideas/ApMech_img006.jpg

http://content.answers.com/main/content/img/McGrawHill/boating/f0029-01.jpg

WHEEL AND AXLE

A shaft attached to a large wheel that rotates

together.

http://images.google.com/imgres?imgurl=http://www.ihpva.org/people/tstrike/drivewheel.jpg&imgrefurl=http://www.ihpva.org/people/tstrike/rectrailer.htm&h=601&w=689&sz=138&hl=en&start=2&tbnid=mPTPDaomyvo2JM:&tbnh=121&tbnw=139&prev=/images%3Fq%3Dwheel%2Band%2Baxle%26gbv%3D2%26hl%3Den%26sa%3DG

http://images.google.com/imgres?imgurl=http://farm2.static.flickr.com/1372/767820703_7d88324fe9.jpg&imgrefurl=http://www.flickr.com/photos/mscolly/767820703/&h=500&w=375&sz=155&hl=en&start=16&tbnid=P0Jy2AcRqeHiaM:&tbnh=130&tbnw=98&prev=/images%3Fq%3Dferris%2Bwheel%2Bnight%26gbv%3D2%26hl%3Den

http://architective.co.uk/images/wood door knob 1.jpg

INCLINED PLANE OR RAMP

A sloping surface that reduces the amount of

force required to raise an object.

http://images.google.com/imgres?imgurl=http://www.blueberryforest.com/images/Images_ct/kinderkram-40513-ramp-389.jpg&imgrefurl=http://www.blueberryforest.com/castle_toys/kinderkram_castle_toys.htm&h=303&w=389&sz=10&hl=en&start=1&tbnid=huBkiupXpz6uAM:&tbnh=96&tbnw=123&prev=/images%3Fq%3Dramp%26gbv%3D2%26hl%3Den%26sa%3DG

WEDGE

A movable inclined plane that changes the

direction of the force.

http://images.google.com/imgres?imgurl=http://www.ray-vin.com/gunparts/img/wedge.jpg&imgrefurl=http://www.ray-vin.com/gunparts/wedge.htm&h=330&w=442&sz=24&hl=en&start=1&tbnid=pCz-jY57a2W-vM:&tbnh=95&tbnw=127&prev=/images%3Fq%3Dwedge%26gbv%3D2%26hl%3Den%26sa%3DG

http://images.google.com/imgres?imgurl=http://www.kitchenknifedrawer.com/files/1696205/uploaded/K6615D.jpg&imgrefurl=http://www.kitchenknifedrawer.com/&h=300&w=300&sz=17&hl=en&start=2&tbnid=YgHQm6QyPDMrmM:&tbnh=116&tbnw=116&prev=/images%3Fq%3Dknife%26gbv%3D2%26hl%3Den

http://images.google.com/imgres?imgurl=http://anatomy.med.umich.edu/surface/head_neck/teeth.jpeg&imgrefurl=http://anatomy.med.umich.edu/surface/head_neck/teeth.html&h=360&w=480&sz=27&hl=en&start=7&tbnid=DC6XSwo7aYH53M:&tbnh=97&tbnw=129&prev=/images%3Fq%3Dteeth%26gbv%3D2%26hl%3Den%26sa%3DG

SCREW

An inclined plane wrapped around a cylindrical

post.

http://www.math.nyu.edu/~crorres/Archimedes/Screw/applications/SeaWorld_screw_big.jpg

http://images.google.com/imgres?imgurl=http://www.bartleby.com/images/A4images/A4screw.jpg&imgrefurl=http://www.bartleby.com/61/imagepages/A4screw.html&h=339&w=444&sz=31&hl=en&start=1&tbnid=59ntZITVadnmsM:&tbnh=97&tbnw=127&prev=/images%3Fq%3Dscrew%26gbv%3D2%26hl%3Den

http://images.google.com/imgres?imgurl=http://www.dkimages.com/discover/previews/778/181532.JPG&imgrefurl=http://www.dkimages.com/discover/Home/Home-and-Household/Kitchen/Kitchen-346.html&h=425&w=358&sz=26&hl=en&start=8&tbnid=8vEE4ofg4zWT1M:&tbnh=126&tbnw=106&prev=/images%3Fq%3Djar%2Bwith%2Bscrew%2Bon%2Blid%26gbv%3D2%26hl%3Den%26sa%3DG

COMPLEX MACHINE

A machine made of more than one simple

machine.

Can you list the types of simple machines used

in this bike?

Wheel & Axle

Lever

Screw

Pulley

MECHANICAL

ADVANTAGE (MA)

The amount of

times a machine

multiplies force or

distance.

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