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
Machine YOURS: TEXTBOOK: A machine is a device that makes work easier by changing the size or direction of a force. Examples: wheelchair, scissors, chopsticks
Simple Machines YOURS: TEXTBOOK: A machine or simple device without moving parts. Examples: lever, pulley, wheel & axle, inclined plane, wedge, screw
Work YOURS: TEXTBOOK: 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
Work or Not Work? OR OR YES NO YES NO
Force 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
Work Input/Work Output YOURS: TEXTBOOK: 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
Lever 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 Machines Lever
Three Classes of Levers First-Class Lever Second-Class Lever Third-Class Lever Elementary School Middle School High School
Three Classes of Levers 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
Pulley YOURS: TEXTBOOK: A simple machine that has a grooved wheel that holds a rope or a cable. Examples: fixed, moveable, block and tackle
The Six Simple Machines Lever Pulley
Types of Pulleys:
Wheel & Axle YOURS: TEXTBOOK: A simple machine consisting of two circular objects of different sizes. Examples: car’s wheel & axle, faucet
The Six Simple Machines Lever Pulley Wheel & Axel
Inclined Plane YOURS: TEXTBOOK: A simple machine that is a straight, slanted surface; a ramp. Examples: ramp or slide
The Six Simple Machines Lever Pulley Wheel & Axel Inclined Plane
Wedge YOURS: TEXTBOOK: 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 Machines Lever Pulley Wheel & Axel Inclined Plane Wedge
Screw YOURS: TEXTBOOK: A simple machine that consists of an inclined plane wrapped around a cylinder. Examples: screw, light bulb
The Six Simple Machines Lever Pulley Wheel & Axel Inclined Plane Wedge Screw
Compound Machine YOURS: TEXTBOOK: A machine made up of more than one simple machine. Examples: manual can opener