| A | B |
|---|
| fulcrum | The point about which a lever pivots. |
| lever | Any rigid rod or plank that pivots, or rotates about a point. |
| inclined plane | A flat, sloped surface. |
| wedge | An inclined plane that moves. |
| screw | An inclined plane wrapped around a cylinder or post. |
| wheel & axle | A simple machine that consists of two circular objects of different sizes that are attached in such a way that they rotate together. |
| force | An influence on the shape, motion, or other characteristics of a body or system. |
| pulley | A wheel or set of wheels with grooved edges over which a rope or chain can be drawn in order to change the direction of a pulling force and increase the capacity for lifting weight. |
| friction | The resistance of a surface to relative motion, as of an object sliding or rolling over it. |
| wheel | Any instrument, device, or apparatus resembling such a disk or frame in shape, motion, or function. |
| convection | The transportation of heat from one place to another by the movement of a liquid or gas. |
| conduction | The transportation of heat or electricity from one place to another directly through an object. |
| radiation | The transportation of heat from one place to another by waves or particles. |
| precipitation | Falling products of condensation in the atmosphere, as rain, snow, or hail. |
| evaporation | When a liquid becomes a gas. This is usually done by heating the liquid. |
| condensation | When a gas turns into a liquid. This is usually done by cooling the gas. |
| transpiration | The process of plants taking up water from the soil and releasing it into the air through the leaves. |
| ground water | Water that soaks into the earth and fills the spaces of pores between the rocks and sediments. |
| land breeze | A wind blowing from the land toward the sea after sunset. |
| sea breeze | A wind blowing from a cool ocean surface onto adjoining warm land. |
