73 terms

Louisiana Interactive Science
Chapter 2
The Tools of Science

matter

Mass is a measure of the amount of ____ in an object.

weight

______ is a measure of the force of gravity acting on an object.

length

A meter(m) is the basic SI unit used for measuring _____.

volume

_______ is the amount of space an object or substance takes up.

density

______ is a measure of how much mass is contained in a given volume.

International System of Units (SI)

A/AN ______ is important because it allows scientists to compare data and communicate with each other about their results.

10

The metric system is a measurement system based on the number ________.

Kilogram (Kg)

In the international system o f Units, the basic unit for measuring mass is the ____________.

temperature

The Kelvin is the SI Unit for ________.

second

The ______ is the SI Unit used to measure time.

estimate

An ___________ is an approximation of a number based on reasonable assumptions.

estimates

Scientists often rely on ______ when they cannot obtain exact numbers.

Anomalous data

_______ are data that do not fit with the rest of a data set.

Precision

______ refers to how close a group of measurements are to each other.

collect, organize, analyze, and present

Scientists use math in their work to ____________ data.

accurate and precise

A reliable measurement is both ___________.

mean

The ______ is the numerical average of a set of data.

Significant figure

______ communicate how precise measurements are.

reasonable

If certain data are not ______, they are called anomalous data.

range

The ______ of a set of data is the difference between the greatest value and the least value in the set.

interpret

When scientists analyze data, they often use displays that make the data easier to ___________.

response

Line graphs display data that show how one variable changes in _____ to another variable.

jagged

If the data points form a _____ line, the variables may not have a clear relationship.

non-linear

A graph in which the data points do not form a straight line is a _________ graph.

trends

Line graphs are powerful tools in science because they allow you to identify ______.

data

Graphs organize ____ into a picture that can be analyzed.

manipulated

In experiments, scientists make changes to one variable, called ______ variable.

predictions

Trends seen from a line graph help scientists make ____ about future data.

straight line

A graph in which the data points form a ______ is a linear graph.

linear graphs

Both _____ and non-linear graphs can show trends.

continuous

Temperature and time are examples of _____ variables.

responding

In experiments, scientists make changes to the manipulated variable, and the data they collect show what happened to the ________ variable as a result of these changes.

directly

Scientists use models to understand things that they cannot observe _____.

performs a function

A system produces a result or _______ .

basic model

The tick's lifecycle can be shown in a _______.

many interactions

A complex system involves __________.

output

Feedback is a type of _______.

process

_____ is what happens in a system.

complex or simple system

A ____ can be represented in a model.

model

A _____ can show your body's digestive system.

changes

Scientists can use models to predict _____ in a system as a result of a change in output or systems feedback.

mechanical

The bicycle is a ______ system.

safety goggles

Which safety symbol would you expect to see for an investigation in which you drop balls to measure how high they bounce?

wear plastic gloves

Which of the following rules is important to follow when you are working with chemicals?

work with a partner

What should you always do to be safe in the field?

tell your teacher

What is the first thing you should do in case of a fire in the laboratory?

breakage

When you are doing an investigation with glass beakers, there will always be a safety symbol for _____.

heat resistant

Use _______ gloves when handling hot objects.

sharp objects

Wear safety goggles when you are working with chemicals or _________.

hands

Always wash your _____ after working in the laboratory.

plastic gloves

When you handle animals, use _________.

fire blanket

A ________ smothers fires.

1000 meters=1 kilometer

How many meters are in a kilometer?

Mass is the amount of matter in an object and Weight is the amount of the force of gravity acting on an object.

What is the difference between mass and weight?

LxWxH (Length x width x height)

How do you find volume?

Density = Mass/ volume ( Mass divided by volume) (kg/m3 kilograms per cubic meter)

How do you find the density? What is the formula?

accuracy

______is the closeness of a a measurement to its true value.

Accuracy refers to how close a measurement is to the true or accepted value and Precision refers to how close a group of measurements are to each other.

What is the difference between precision and accuracy?

digits

What does a significant figure include fewest?

median

_________ is the middle number in a set of data.

left to right

What direction does the horizontal axis of a graph run?

system

A _______ is a group of parts that work together.

Mechanical is man made and environment is made in the environment or in nature.

What is the difference between mechanical and environmental systems?

many interactions

A complex system involve ________.

Good preparation - Safety

What is your chief concern when you perform in the lab?

Tell your teacher immediately and follow directions

What are the first two steps you should take when an accident happens in the classroom?

1. Always tell an adult where you will be working. 2. Always work with a partner.

3. Wear appropriate clothing

3. Wear appropriate clothing

What safety precautions should you take when working in the field?

3 digits ; the 5 is estimated

If you have a row of fence boards that is 78.5 meters long. How many significant figures are in this measurement? Which digit is estimated?

...

Find the mean, median, mode and range for this data.

24, 16, 11, 10, 16, 4, 17

24, 16, 11, 10, 16, 4, 17

model

A representation of a simple or complex object or process is a __________.

Multiply length times width times height.

How do you find the volume of a regular solid?

Use the displacement method.

How do you find the volume of an irregular solid?

Data that form a straight line result in a linear graph. Data points that don't fall along a straight line form a nonlinear graph.

What is the difference between a linear graph and a nonlinear graph?