| A | B |
|---|
| work | The product of force and distance when a force is used to move an object. |
| energy | The ability to do work or cause change, such as moving an object some distance. |
| force | A push or a pull exerted on an object. |
| Another way to think of work is | the transfer of energy |
| The two kinds of energy are | kinetic energy and potential energy. |
| potential energy | Energy that is stored and held in readiness. |
| kinetic energy | Energy that an object has because of its motion. |
| elastic potential energy | The energy of stretched or compressed objects. |
| gravitational potential energy | Potential energy that depends on the height of an object. |
| the formula for gravitational potential energy | weight x height |
| another formula for gravitational potential energy | mass x gravitational acceleration x height |
| radiant energy | Energy that travels in waves; the waves have some electrical properties and some magnetic properties. |
| energy conversion | The process of changing one form of energy into another. |
| Most forms of energy can be | converted into any other form. |
| law of conservation of energy | The rule that energy cannot be created or destroyed. |
| photosynthesis | The process by which plants and some other organisms capture light energy and use it to make food from carbon dioxide and water. |
| pigment | A molecule that absorbs light. |
| chlorophyll | A green pigment found in the chloroplasts of plants, algae, and some bacteria. |
| chloroplast | A structure in the cells of plants and some other organisms that captures energy from sunlight and uses it to produce food. |
| hrough the process of photosynthesis, plants and some other organisms convert the sun’s radiant energy into | chemical energy. |
| respiration | The process by which cells break down simple food molecules to release the energy they contain. |
| fuel | A material that releases energy when it burns. |
| fossil fuel | An energy-rich substance (such as coal, petroleum, or natural gas) formed from the remains of organisms. |
| combustion | The burning of a fuel. |
| power | The rate at which work is done or the rate at which one form of energy is converted into another. |
| formula for power | work OVER time |
| formula 2 for power | force x distance OVER time |
