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# zachry 9252012 quiz

### quiz 9252012 for science 8

observation using your 5 senses to describe an object (thing) or event (something that happens)
Qualitative An observation that tells what an object is like-shape, color, texture, smell
Quantitative An Observation that includes a number or could be measured and have a number
Variable Something that can be changed in an experiment or a math problem
Independent Variable The variable that the scientist changes on purpose in order to find out what will happen
Dependent variable the variable that a scientist measures and checks at the end of the experiment
one the number of variables that are changed during an experiment
meter the base unit in the metric system for measuring distance
liter the base unit in the metric system for measuring volume
gram the base unit in the metric system for measuring mass
milli means 1/1000 a milligram is about the size of a grain of sand milli's are very small!
Kilo means 1000 a kilogram is about 2.2 pounds and a kilometer is a bit more than 1/2 a mile, a kiloliter is 500 2 liter bottles!
centi 1/100 there are 100 centimeters in a meter
sample size is the number of trials or subjects in an experiment. Generally the larger the sample size the more reliable the information.
Speed speed= distance divided by time
motion the change of location of an object compared to a reference point
distance the actual length of the route that an object has traveled
displacement the distnce between your starting and ending point and the direction you traveled. This is the shortest possible distance between start and finish (as the crow flies)and the direction you travel
average speed speed calculated over a period of time
instantaneous speed speed at an instant of time (usually a second or less)
velocity is the speed of an object and the direction it is traveling in-change in speed or direction changes velocity!
interval a period of time
accuracy making good and exact measurements
acceleration a change in velocity (direction or speed) of an object divided by the time it takes for the change to occur
Created by: zachryca