| A | B |
|---|
| Force | a push or pull |
| Gravity | the force that makes objects pull toward each other |
| Friction | the force caused by two objects rubbing together that slows down or stops objects |
| Work | something done whenever a force makes an object move through a distance |
| Energy | the ability to do work |
| Simple Machine | one of six kinds of tools with few or no moving parts that make work easier |
| Lever | a simple machine made of a bar that is supported underneath at some point |
| Load | an object that is being moved |
| Inclined Plane | a simple machine that is a flat surface with one end higher than the other |
| Wedge | a simple machine used to cut or split an object |
| Screw | a simple machine used to hold objects together |
| Wheel and Axle | a simple machine that has a center rod attached to a wheel |
| Gear | a wheel with jagged edges like teeth |
| Pulley | a simple machine made of a wheel and rope |
| Compound Machine | a machine that is made up of two or more simple machines |
| Examples of Levers | bottle opener, crowbar, seesaw, shovel, nutcracker, tweezers |
| Examples of Inclined Planes | ramp, slide, stairs, escalator, sloping, driveway, floor |
| Examples of wheels & axle | wagon, car, doorknob, wrench, classroom pencil sharpener |
| Examples of Screw | wood screw, vise, bolt, jar lid, corkscrew, adjustable stool, light bulb |
| Examples of Pulleys | crane, flagpole, curtain rod, tow truck, windown blind, scaffold |
| Examples of Wedges | knife, pin, needle, chisel, nail, ax, key, bow of a boat, snowplow, paper cutter |
