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# Machines Made Simple - PowerPoint PPT Presentation

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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Presentation Transcript

• Six basic types

• Designed to make work easier

• Few or no moving parts

• Combine to form complex machines

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• 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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• 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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• 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

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• 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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• 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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• Two inclined planes joined back to back.

• Wedges are used to split things.

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NSF North Mississippi GK-8

• 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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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. 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. 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. 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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A

B

B would be easier because Eduardo is using a pulley.

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A

B

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

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A

B

B would be easier because a jack uses a screw.

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

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

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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 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.) house. What kind of simple machine is a doorknob?

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