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Simple machine	A tool with few or no moving parts that makes work easier		phys-simple-machines
How many kinds of simple machines are there?	Six		phys-simple-machines
Name the six simple machines	Lever, wheel and axle, pulley, inclined plane, wedge, screw		phys-simple-machines
Lever	A bar that rotates around a point called a fulcrum		phys-simple-machines
Fulcrum	The pivot point of a lever		phys-simple-machines
Effort	The force you apply to a machine		phys-simple-machines
Load (resistance)	The weight a machine moves		phys-simple-machines
First-class lever	Fulcrum is between the effort and the load		phys-simple-machines
Second-class lever	Load is between the fulcrum and the effort		phys-simple-machines
Third-class lever	Effort is between the fulcrum and the load		phys-simple-machines
Example of a first-class lever	A seesaw or a crowbar		phys-simple-machines
Example of a second-class lever	A wheelbarrow or a nutcracker		phys-simple-machines
Example of a third-class lever	A fishing rod, a broom or tweezers		phys-simple-machines
Inclined plane	A flat sloped surface used to raise or lower loads		phys-simple-machines
Example of an inclined plane	A ramp or a slide		phys-simple-machines
Wedge	Two inclined planes put together to split or cut things		phys-simple-machines
Example of a wedge	An axe, knife or doorstop		phys-simple-machines
Screw	An inclined plane wrapped around a cylinder		phys-simple-machines
Example of a screw	A jar lid, a bolt or a light bulb base		phys-simple-machines
Wheel and axle	A wheel joined to a rod so they turn together		phys-simple-machines
Example of a wheel and axle	A doorknob, a steering wheel or a bicycle wheel		phys-simple-machines
Pulley	A wheel with a rope or chain that changes the direction of a pull		phys-simple-machines
Example of a pulley	A flagpole rope, a crane or a window blind		phys-simple-machines
Fixed pulley	A pulley attached in place; changes the direction of force		phys-simple-machines
Movable pulley	A pulley that moves with the load; reduces the force needed		phys-simple-machines
Block and tackle	A system of pulleys that gives a large mechanical advantage		phys-simple-machines
Mechanical advantage	How many times a machine multiplies your effort		phys-simple-machines
Do machines reduce the work done?	No; they make work easier by changing force or direction		phys-simple-machines
What do you give up when you use less force?	You move through a longer distance		phys-simple-machines
Compound machine	Two or more simple machines working together		phys-simple-machines
Example of a compound machine	Scissors, a bicycle or a can opener		phys-simple-machines
Scissors are made of	Levers and wedges		phys-simple-machines
A longer ramp makes it	Easier to push things up, but you push farther		phys-simple-machines
Work	Force times distance		phys-simple-machines
Wheelbarrow	A second-class lever with a wheel and axle		phys-simple-machines
Pliers	Two levers joined together		phys-simple-machines
Bottle opener	A second-class lever		phys-simple-machines
Stairs	A set of inclined planes		phys-simple-machines
Spiral staircase	A kind of screw shape		phys-simple-machines
Zipper	A group of tiny wedges		phys-simple-machines
Chisel	A wedge		phys-simple-machines
Faucet handle	A wheel and axle		phys-simple-machines
Gears	Toothed wheels that turn each other		phys-simple-machines
Ax splitting wood	Uses a wedge to push wood apart		phys-simple-machines
Drill bit	A screw		phys-simple-machines
Teeter-totter	A first-class lever		phys-simple-machines
Baseball bat	A third-class lever		phys-simple-machines
Hammer pulling a nail	A first-class lever		phys-simple-machines
Why is a longer lever arm helpful?	Less effort force is needed to lift the load		phys-simple-machines
Archimedes' famous line about levers	Give me a place to stand and I will move the Earth		phys-simple-machines