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Machines Made Simple. Simple Machines. Six basic types Designed to make work easier Few or no moving parts Combine to form complex machines. Lever. Lever. In a first class lever the pivot is in the middle and the load and effort is on either side Think of a see-saw. Levers.

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Simple machines
Simple Machines

  • Six basic types

  • Designed to make work easier

  • Few or no moving parts

  • Combine to form complex machines

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Lever
Lever

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Lever1
Lever

  • In a first class lever the pivot is in the middle and the load and effort is on either side

  • Think of a see-saw

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Levers
Levers

  • In a second class lever the pivot is at the end, with the load in the middle

  • Think of a wheelbarrow

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Levers1
Levers

  • 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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Pulley
Pulley

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Pulley1

Pulley

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Wheel and axel
Wheel and Axel

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Wheel axle
Wheel & Axle

  • The wheel and axle are a simple machine

  • The axle is a rod that goes through the wheel which allows the wheel to turn

  • Gears are a form of wheels and axles

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Inclined plane
Inclined Plane

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Machines made simple

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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Wedge
Wedge

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Machines made simple

Wedge

  • Two inclined planes joined back to back.

  • Wedges are used to split things.

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Screw
Screw

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Machines made simple

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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Simple machines1
Simple Machines

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Machines made simple

Eduardo is helping his family move out of their old house. Help him decide which task would be easier, and then help him figure out what simple machine makes the job easier.

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Eduardo has to move some heavy boxes into the moving truck
Eduardo has to move some heavy boxes into the moving truck. Help him decide which task would be easier, and then help him figure out what simple machine makes the job easier.

A

B

B would be easier because a ramp is an inclined plane.

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Eduardo has to move a heavy box a long distance
Eduardo has to move a heavy box a long distance. Help him decide which task would be easier, and then help him figure out what simple machine makes the job easier.

A

B

A would be easier because the wagon has wheels and axels.

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Eduardo needs to tear off a piece of packing tape
Eduardo needs to tear off a piece of packing tape. Help him decide which task would be easier, and then help him figure out what simple machine makes the job easier.

A

B

B would be easier because the edges of the scissors are wedges.

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Eduardo needs to move a heavy box to his room on the fourth floor
Eduardo needs to move a heavy box to his room on the fourth floor.

A

B

B would be easier because Eduardo is using a pulley.

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Eduardo needs to help his father move the refrigerator
Eduardo needs to help his father move the refrigerator. floor.

A

B

A would be easier because the dolly is a lever (with wheels and an axel).

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Eduardo needs to help his father change a flat tire on the moving truck
Eduardo needs to help his father change a flat tire on the moving truck.

A

B

B would be easier because a jack uses a screw.

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Machines made simple

Now that Eduardo and his family have reached their new house, they need some help in unpacking their belongings. Help Eduardo decide on the best simple machine to use in each situation.

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Eduardo needs to open the boxes his mom sealed with packing tape what simple machine should he use
Eduardo needs to open the boxes his mom sealed with packing tape. What simple machine should he use?

Eduardo should use a wedge (probably a pair of scissors).

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Machines made simple
The door to the moving truck is jammed shut. What simple machine might Eduardo’s father use to open it?

Eduardo’s father should use a lever (most likely a crowbar).

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Machines made simple
There is a flagpole outside Eduardo’s new school. What simple machine could be used to raise and lower the flag?

A pulley is used to raise and lower the flag.

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Machines made simple
Eduardo’s mom wants to hang a cabinet in the new kitchen. What simple machine might she use to attach it to the wall?

Eduardo’s mom could use a screw to attach the cabinet to the wall and hold it in place.

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Machines made simple
Eduardo helped his father install doorknobs in the new house. What kind of simple machine is a doorknob?

A doorknob is a wheel and axel.

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Simple machines2
Simple Machines house. What kind of simple machine is a doorknob?

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Identifying simple machines
Identifying Simple Machines house. What kind of simple machine is a doorknob?

Lever

Wheel and axle

Wedge

Screw

Pulley

Inclined plane

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Image sources
Image Sources house. What kind of simple machine is a doorknob?

<http://etc.usf.edu/clipart>

<http://www.oz.net/~peragine/doorknob.jpg>

<http://www.theteachersguide.com/clipart/scissors.gif>

<http://www.weprintcolor.com/stockimages/construction/images/Black%20metal%20crowbar.jpg>

<http://67.19.222.106/military/graphics/flagpole.jpg>

<http://www.morris.umn.edu/UMMimages/public/images/campus_misc/flagpole.jpg>

<http://www.phillips-screw.com/images/homeMain.jpg>

<http://mws.mcallen.isd.tenet.edu/mchi/ipc/ch15htm/images15/Screw.jpg>

<http://www.discountramps.com/handi-van_ramp.gif>

http://staff.harrisonburg.k12.va.us/~mwampole/1-resources/simple-machines/flag-pole.jpg

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Images sources cont
Images Sources (cont.) house. What kind of simple machine is a doorknob?

<http://www.physics.uwaterloo.ca/demo/bikewheelgyro.html>

<http://www.piratescave.co.uk/about_us.htm>

<http://staff.harrisonburg.k12.va.us/~mwampole/1-resources/simple-machines/handicap-ramp.html>

<http://library.thinkquest.org/J002079F/wedge.htm>

<http://www.idahoptv.org/dialogue4kids/season7/simplemachines/facts.html>

<http://www.scienceclarified.com/Io-Ma/Machines-Simple.html>

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