Simple Machines

• First, rank the following words from 0-5 (0= you have never heard of this word & 5= you know the word VERY well). Second, explain what the following terms mean in your own words:– Machine

– Simple machines

– Work

– Force

– Work input/Work output

– Lever

-Pulley-Wheel & axle-Inclined plane-Wedge-Screws-Compound machine

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• A machine is a device that makes work easier by changing the size or direction of a force.

• Examples: wheelchair, scissors, chopsticks

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• A machine or simple device without moving parts.

• Examples: lever, pulley, wheel & axle, inclined plane, wedge, screw

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• Work is the transfer of energy to an object by using a force that causes the object to move in the direction of the force.

• Work is done on an object if two things happen: 1) the object moves as a force is applied, 2) the direction of the object’s motion is the same as the direction of the force.

• Examples: pushing a ball up a hill

OR ORYES NO YES NO

YOURS: TEXTBOOK:• A push or a pull

exerted on an object in order to change the motion of the object; force has size and direction.

• Examples: people, bulldozer, static electricity

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• Work input is the work done on the machine.

• Work out put is the work done by the machine.

• Examples: opening a paint can

The Six Simple Machines

The Six Simple Machines

YOURS: TEXTBOOK:• A lever is a simple machine

that has a bar that pivots at a fixed point, called a fulcrum.

• Examples: first-class lever (see saw), second-class lever (wheelbarrow or soda bottle opener), third-class lever (lifting weights or hammering a nail)

The Six Simple MachinesLever

First-Class Lever Second-Class Lever Third-Class Lever

Elementary School Middle School High School

First-Class Lever Second-Class Lever Third-Class Lever

2nd class- the load is between the fulcrum and the force

3rd class- the force is between the load and the fulcrum

Elementary School Middle School High School

1st class- fulcrum is placed between the load and the force

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• A simple machine that has a grooved wheel that holds a rope or a cable.

• Examples: fixed, moveable, block and tackle

The Six Simple MachinesLever Pulley

Types of Pulleys:

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• A simple machine consisting of two circular objects of different sizes.

• Examples: car’s wheel & axle, faucet

The Six Simple MachinesLever Pulley Wheel & Axel

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• A simple machine that is a straight, slanted surface; a ramp.

• Examples: ramp or slide

The Six Simple MachinesLever Pulley Wheel & Axel

Inclined Plane

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• A simple machine that is made up of two inclined planes that move; often used for cutting.

• Examples: knife, axe, door stop

The Six Simple MachinesLever Pulley Wheel & Axel

Inclined Plane Wedge

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• A simple machine that consists of an inclined plane wrapped around a cylinder.

• Examples: screw, light bulb

The Six Simple MachinesLever Pulley Wheel & Axel

Inclined Plane Wedge Screw

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• A machine made up of more than one simple machine.

• Examples: manual can opener