Because it is affected by gravity, an object’s mass would be less on the moon, where there is less gravity.
Your heart pumping faster when you exercise is an example of input.
The basic SI unit for the volume of a rectangular solid is the liter.
Scientists may make assumptions to simplify a model.
The output of a toaster is electricity.
All models are physical objects.
Density determines whether an object will float or sink in water.
The basic unit for measuring mass is the kilogram.
A student on the archery team gets all her arrows in the same spot on the target. They are all outside the bull’s eye. Which best describes her results?
A student added the measurements 36.67 g and 4.1 g. Which of the following expresses the sum with the correct number of significant figures?
Which of the following shows the mean with the correct number of significant figures for the numbers 15.6, 14.1, 7.7, 12.9, 12.9?
A student calculated the density of tin to be 7.20 g/mL. The actual density of tin is 7.29 g/mL. Which of the following is his percent error?
Scientists test their ideas about things they cannot observe directly by building.
Models can help scientists understand a system’s
Input, output, and process are parts of a(n)
Scientists may use a computer to keep track of the variables in a complex
What is the first safety step you should take before an investigation?
What are the first two steps you should follow in case of a fire?
Which of the following safety procedures should you always follow in the field?
Any area outside of the science lab is called the field.
Wear an apron to protect yourself and your clothes from chemicals.
Wear plastic gloves to protect your hands from hot beakers.
A fire blanket is used to smother flames.
An estimate is an approximation of a number based on reasonable assumptions.
Accuracy refers to how close a group of measurements are to each other.
The mean is the middle number in an ordered set of data.
The median appears most often in a list of numbers.
To find percent error, you subtract the true value from the experimental value and divide by the true value.
The anomalous data in a measurement include all digits measured exactly, and one estimated digit.
Bar graphs can be used to represent categorical data.
When a graph has no clear trend, it means the variables are related.
Scientists control changes in the independent variable.
Data points do not fall in a straight line on a(n) nonlinear graph.
When scientists use graphs to identify trends, they are making a forecast about what will happen in the future.