| A | B |
|---|
| machine | makes work easier |
| inclined plane | flat surface that is sloped |
| wedge | an inclined plane that moves; it makes it easier to lift or split objects |
| screw | an inclined plane wrapped around a cylinder |
| lever | a simple machine that makes it easier to lift or move objects; has a fulcrum |
| fulcrum | the turning point around which a lever moves |
| load | the object being moved |
| effort | the force used to move a load |
| examples of wheels and axles | steering wheels, doorknobs, faucet handles, screwdrivers |
| pulley | a wheel with a groove around the rim and a rope that fits in the groove |
| fixed pulley | a pulley that does not move |
| movable pulley | a pulley that moves along a rope or chain |
| wheel and axle | a simple machine that changes the amount of force needed to do work |
| a wedge has | a thin edge and an opposite wide edge |
| as a screw is turned, | it moves objects along the thread |
| examples of screws | screw caps on bottles |
| first-class levers | fulcrum in the middle |
| second-class levers | load in the middle |
| A ramp... | is an incline plane |
| A doorstop... | is a wedge |
| A bottle and cap... | are screws |
| A hand truck... | is a lever |
| A steering wheel... | is a wheel and axle |
| A flagpole and rope... | is a pulley. |
