| A | B |
|---|
| Acceleration | The rate at which the velocity of an object changes. |
| Action Force | The force that acts on or pushes an object into another object. |
| Archimede's Principle | "An object in water or air displaces a volume of water or air equal to the object's volume." |
| Atoms | These are the smallest particles that can be identified as an element, such as hydrogen or iron or silver or gold. |
| Ballast | Airships carry these bags of weights to throw overboard to lighten their load and rise higher. |
| Conservation of Energy | "Energy is never lost, it just changes its form." |
| Density | This measurement of an object is equal to its mass divided by its volume. |
| Drag | The specific name of the friction force between an object and air. |
| Elasticity | The property of a spring that makes it return to its original shape. |
| Elastic Constant | The measurement of the springy-ness of a spring. |
| Elastic Limit | The greatest force you can apply to a spring before it loses its elasticity. |
| Energy | The capacity to do work. |
| Force | Pushes or pulls an object making it speed up, slow down, change shape or change direction. |
| Friction | A force that opposes motion. It happens when surfaces rub against each other. |
| Fulcrum | The central point of a lever about which the lever moves or turns. |
| Gear Ratio | The relationship of the sizes of two gears. |
| Gears | Toothed wheels that fit together for the purpose of transferring force or motion. |
| Gravity | A force that attracts objects to the Earth. |
| Joule | A measurement label for work and energy. |
| Kinetic Energy | The energy of movement. |
| Lubricants | These items, such as oil and grease, reduce friction. |
| Mass | The amount of matter (atoms) in an object. |
| Mechanical Advantage | Compares the effort applied to the work done. Levers and screws increase it. |
| Molecules | Elements (atoms) combined by chemical forces. Water is an example. |
| Momentum | The measurement of force necessary to change and object's speed or direction of motion. |
| Moment | The measurement of the turning force applied to an object. |
| Newton's First Law of Motion | "An object in motion will stay in motion until a force acts on that object." |
| Newton's Third Law of Motion | "Every action has an equal and opposite reaction." |
| Potential Energy | Energy that is stored. |
| Reaction Force | The force that resists or pushes back against an action force. |
| Upthrust | The name of the specific force that tries to pull water or air back into place, causing an object to float (or sink). |
| Velocity | Speed with direction. |
| Volume | The amount of space that an object takes up. |
| Work | The result of an object applying a force to another object. |
