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8thUnit 1 Vocabulary
8th Grade Discovery Education Vocab Terms
| Term | Definition |
|---|---|
| Acceleration | A change in the velocity. |
| Atmosphere | The layers of gases that surround a planet. |
| Contact | The act of touching. |
| Earth | The third planet from the Sun. |
| Force | A pull or push that is applied to an object. |
| Frame of Reference | An item against which the motion of an object can be measured. |
| Friction | A force that opposes the motion of a body across a surface or through a gas or liquid. |
| Kinetic Energy | The energy an object has due to its motion. It is one half the product of the object's mass and the square of its speed. |
| Kinetic Friction | Resistive force between two objects moving pass each other. Objects appearing smooth are rough when you examine them on a microscopic level. This roughness makes it difficult for two objects to slide past each other. |
| Magnitude | Size of ground movement caused by seismic waves due to energy released. |
| Mass | The amount of matter in an object. |
| Newton's Law | The three fundamental laws Isaac Newton discovered governing the motion of objects. |
| Newton's First Law | "An object in motion stays in motion, unless acted on by a force. An object at rest stays at rest unless acted on by a force." |
| Newton's Second Law | "Force is the product of mass and acceleration." |
| Newton's Third Law | "For every action force, there is an equal but opposite reaction force." |
| Orbit | The circular path of an object as it revolves around another object. |
| Potential Energy | The amount of energy that is stored in an object; energy that an object has because of its position relative to other objects. |
| Speed | Distance traveled per unit of time. |
| Surface | The top of an object; the outside of an object; the boundary between two objects or materials. |
| Velocity | The speed and direction of moving objects. |
| Weight | The force of gravity on an object. |
| Work | A force applied to an object over a distance. |
| Conservation of Energy | Energy cannot be created out of nothing, nor can it be completely destroyed. Energy can only change its form. |
| Density | An object's mass divided by its volume; a measure of how many particles are packed together into a certain amount of space. |
| Gravity | A force that exists between any two objects that have mass. |
| Hydrogen | The chemical element consisting of one proton and one electron. |
| Measure | To use a tool to learn more about the volume, length or weight of an object. |
| Motion | A change in the position of an object compared to another object. |
| Oxygen | An element that makes up about 21% of Earth's atmosphere; a gas in Earth's atmosphere and in water that living organisms breathe. |
| Potential Energy | The amount of energy that is stored in an object; energy that an object has because of its position relative to other objects. |
| System | A group of parts that work together to function or perform a task. |
| Thrust | A reaction force that pushes an object forward. |
| Asteroid | A small object made of rock or metal that orbits the sun. |
| Comet | Body of ice and dust that travels in a long narrow orbit around the sun. |
| Meteor | A streak of light in the sky that forms when a piece of rock from space burns up in Earth's atmosphere. |
| Planet | A large circular mass that revolves around a star. |
Created by:
Mquinteros
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