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8th Physical Science
Term | Definition |
---|---|
qualitative observation | made by gathering information that can be recorded using descriptive language |
quantitative observation | 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 scientists expect to happen every time under a particular set of conditions |
constants | part of an experiment that is held in the same condition for control and experimental |
variable | part of the experiment that changes |
manipulated variable | a factor in a controlled experiment that is intentionally changed by the experimenter |
scientific theory | a well tested explanation for a wide range of observations or experiment results |
inquiry | to ask for information |
responding variable | 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 |
physical properties | change of shape and appearance but not the object (what it is) |
chemical properties | a change in matter that makes one or more new substances |
matter | anything that has mass and takes up space |
mass | measurement of how much matter is in something |
weight | a measurement of the force of gravity on you |
newton | a unit of force required to move one kilogram one meter squared |
mechanical advantage | the ratio of the output force produced by a machine to the applied input force |
gravity | a force that pulls objects towards each other |
work | force exerted on an object that causes it to move |
force | a push or pull exerted on a nobject |
newtons 1st law | object in motion stays in motion, object at rest stays at rest |
newtons 2nd law | the amount of force needed to make an object change its speed depends on the mass ob the object and the acceleration required |
newtons 3rd law | for every action there is an equal and opposite reacion |
accuracy | the state of being correct or precise |
calibration | the process of calibrating an instrument or experimental readings |
graduated cylinder | a piece of lab equipment that is used to measure the volume of a liquid |
International System of Measurement | an internationally accepted system of physical units |
liquid | free flowing but has constant volume |
meniscus | curved surface of a liquid in a tube |
precision | the fact of being exact and accurate |
triple beam balance | a typical mechanical balance, the beam is split into 3 parallel beams that each support one weight |
unit | individual component of a larger more complex whole |
volume | amount of space something occupies |
pure substance | a substance made of only one kind of material having definite proportional amounts and properties |
mixture | matter that consists of two or more substances not chemically combined |
element | the simplest type of pure substance |
compound | two or more elements chemically combined, but appearing to be evenly blended |
homogeneous mixture | two or more substances not chemically combined, and appearing to be evenly blended |
heterogeneous mixture | two or more substances not chemically combined, and appearing non-uniform with physically distinct substances included |
condensation point | temperature at which gas turns to a liquid |
conductor | a material that does allow electricity or heat to pass through easily |
density | an object's mass compared to its volume. mass divided by volume is density |
deposition | a gas changing into a solid without changing into a liquid |
ductile | able to be pulled into long, thin wires |
flexible | able to bend without breaking |
freezing point | temperature in which a liquid turns to a solid |
insulator | a material that does not allow electricity to heat to pass through easily |
luster | shininess; the property of something that shines with reflected light |
magnetic | material that is attracted to magnets |
malleable | able to be hammered or pressed into flat sheets |
melting point | temperature at which solid turns to a liquid |