Introduction to Simple Machines

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

Machine A tool that helps us do work

Machines help us by:

Friday, August 16, 13

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

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

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.

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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!

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Work the result of force moving an

object

Example – Picking up something heavy is

hard work!

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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

Friday, August 16, 13

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

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

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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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

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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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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

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

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

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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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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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!

Friday, August 16, 13

How Work is Done

Energy Force Function

Work is done!

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