introduction to simple machines
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Simple MachinesMrs. ChastainThird Grade
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Machine A tool that helps us do work
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Machine A tool that helps us do work
Friday, August 16, 13
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Machine A tool that helps us do work
Machines help us by:
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Machine A tool that helps us do work
Machines help us by:1. Changing the amount of force on an
object.
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Machine A tool that helps us do work
Machines help us by:1. Changing the amount of force on an
object.
Friday, August 16, 13
![Page 7: Introduction to Simple Machines](https://reader034.vdocuments.net/reader034/viewer/2022052315/54626f42af7959a4058b4a11/html5/thumbnails/7.jpg)
Machine A tool that helps us do work
Machines help us by:1. Changing the amount of force on an
object.
2. Changing the direction of the force.
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Force a push or pull that changes the motion or shape of an object
Example: I push a bookshelf to move it.
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Force a push or pull that changes the motion or shape of an object
Example: I push a bookshelf to move it.
Friday, August 16, 13
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Energy the ability to do work
Example: I must have energy to run the mile.
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Energy the ability to do work
Example: I must have energy to run the mile.
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Work the result of force moving an
object
Example – Picking up something heavy is
hard work!
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Work the result of force moving an
object
Example – Picking up something heavy is
hard work!
Friday, August 16, 13
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Work the result of force moving an
object
Example – Picking up something heavy is
hard work!
Friday, August 16, 13
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Gravity
Gravity is the force that constantly pulls objects toward Earth.
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Gravity
Gravity is the force that constantly pulls objects toward Earth.
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Simple Machineshave few or no moving parts
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Simple Machineshave few or no moving parts
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Simple Machineshave few or no moving parts
• Lever
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Simple Machineshave few or no moving parts
• Lever• Inclined Plane
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Simple Machineshave few or no moving parts
• Lever• Inclined Plane• Wedge
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Simple Machineshave few or no moving parts
• Lever• Inclined Plane• Wedge• Screw
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Simple Machineshave few or no moving parts
• Lever• Inclined Plane• Wedge• Screw• Wheel and Axel
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Simple Machineshave few or no moving parts
• Lever• Inclined Plane• Wedge• Screw• Wheel and Axel• Pulley
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Lever made of a board or bar (arm)
set on top of a fulcrum used to lift weight
Example: seesaw, crowbar, baseball bat, rake
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Lever made of a board or bar (arm)
set on top of a fulcrum used to lift weight
Example: seesaw, crowbar, baseball bat, rake
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![Page 27: Introduction to Simple Machines](https://reader034.vdocuments.net/reader034/viewer/2022052315/54626f42af7959a4058b4a11/html5/thumbnails/27.jpg)
Lever made of a board or bar (arm)
set on top of a fulcrum used to lift weight
Example: seesaw, crowbar, baseball bat, rake
Friday, August 16, 13
![Page 28: Introduction to Simple Machines](https://reader034.vdocuments.net/reader034/viewer/2022052315/54626f42af7959a4058b4a11/html5/thumbnails/28.jpg)
Lever made of a board or bar (arm)
set on top of a fulcrum used to lift weight
Example: seesaw, crowbar, baseball bat, rake
Friday, August 16, 13
![Page 29: Introduction to Simple Machines](https://reader034.vdocuments.net/reader034/viewer/2022052315/54626f42af7959a4058b4a11/html5/thumbnails/29.jpg)
Lever made of a board or bar (arm)
set on top of a fulcrum used to lift weight
Example: seesaw, crowbar, baseball bat, rake
Friday, August 16, 13
![Page 30: Introduction to Simple Machines](https://reader034.vdocuments.net/reader034/viewer/2022052315/54626f42af7959a4058b4a11/html5/thumbnails/30.jpg)
Inclined Plan a slanted surface to make
lifting easier
Example: ramp, stairs
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Inclined Plan a slanted surface to make
lifting easier
Example: ramp, stairs
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Inclined Plan a slanted surface to make
lifting easier
Example: ramp, stairs
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Wedge two inclined planes together used to
raise an object or split an object
Example: knife, door wedge, ax
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Wedge two inclined planes together used to
raise an object or split an object
Example: knife, door wedge, ax
Friday, August 16, 13
![Page 35: Introduction to Simple Machines](https://reader034.vdocuments.net/reader034/viewer/2022052315/54626f42af7959a4058b4a11/html5/thumbnails/35.jpg)
Wedge two inclined planes together used to
raise an object or split an object
Example: knife, door wedge, ax
Friday, August 16, 13
![Page 36: Introduction to Simple Machines](https://reader034.vdocuments.net/reader034/viewer/2022052315/54626f42af7959a4058b4a11/html5/thumbnails/36.jpg)
Screw an inclined plane wrapped around a pole or shaft that is used to hold
materials together or drill holes
Example: drill bit, screws
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Screw an inclined plane wrapped around a pole or shaft that is used to hold
materials together or drill holes
Example: drill bit, screws
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Screw an inclined plane wrapped around a pole or shaft that is used to hold
materials together or drill holes
Example: drill bit, screws
Friday, August 16, 13
![Page 39: Introduction to Simple Machines](https://reader034.vdocuments.net/reader034/viewer/2022052315/54626f42af7959a4058b4a11/html5/thumbnails/39.jpg)
Screw an inclined plane wrapped around a pole or shaft that is used to hold
materials together or drill holes
Example: drill bit, screws
Friday, August 16, 13
![Page 40: Introduction to Simple Machines](https://reader034.vdocuments.net/reader034/viewer/2022052315/54626f42af7959a4058b4a11/html5/thumbnails/40.jpg)
Wheel and Axel a wheel that turns on a post to help
move things quickly and easily
Example: steering wheel, doorknob, screwdriver
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Wheel and Axel a wheel that turns on a post to help
move things quickly and easily
Example: steering wheel, doorknob, screwdriver
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![Page 42: Introduction to Simple Machines](https://reader034.vdocuments.net/reader034/viewer/2022052315/54626f42af7959a4058b4a11/html5/thumbnails/42.jpg)
Pulley made of rope and string wound
around a reel to change the direction of a force
Example : flagpole, clothesline, cranes, fishing reel
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Pulley made of rope and string wound
around a reel to change the direction of a force
Example : flagpole, clothesline, cranes, fishing reel
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Compound Machine two or more simple machines
Examples:
Bike
Car
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Compound Machine two or more simple machines
Examples:
Bike
Car
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How Work is Done
Energy Force Function
Work is done!
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How Work is Done
Energy Force Function
Work is done!
Friday, August 16, 13