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8th Physical Sci
8th physical sci
| Term | Definition |
|---|---|
| Mass | A measure of how much is in an object |
| Matter | Anything that has mass or takes up space |
| Weight | A measure of force or gravity on an object |
| Physical Properties | A characteristic of a pure substance that can be observed with out changing it into another substance |
| Chemical Properties | A characteristic of a pure substance that describes its ability to change |
| Qualitative observations | made by gathering information that can be recorded using descriptive language |
| Quantitative observations | Made by gathering information that can be recorded as a number with a measurement unit |
| Inference | not a fact, but an interpretation of what the direct observations mean |
| scientific law | Describes what scientist expect to happen every time under a particular set of conditions |
| constant | part of an experiment that is held in the same condition for control and experimental |
| variable | part of the experiment that changes |
| independent variable | a factor in a controlled experiment that is intentionally changed by the experimenter |
| theory | well tested explanation for a wide range of observations or experimental results |
| inquiry | to ask information |
| responding | a resulting factor in a controlled experiment that is observed and measured to see if it changes due to the manipulation of another variable |
| experiment | a course of action completed in order to test a hypothesis |
| control | a standard to which all other levels are compared in a scientific experiment |
| Work | is a force exerted on an object that causes it to move |
| force | a push or pull exerted on an object |
| newton | a unit of force required to move 1 kilogram 1 meter squared |
| mechanical advantage | the ratio of the output force produced by a machine to the applied input force. |
| newton's first law | an object in rest stays in rest or an object that is moving at a speed in a straight lines keeps moving at that speed unless another force acts on it |
| newton's second law | the amount of force needed to make an object change its speed depends on the mass of the object and the acceleration required |
| newtons third law | for every action there is an equal and opposite action |
| gravity | force that pulls objects toward each other. |
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