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Physics 1 Regular
Terms in this set (68)
Units are important when measuring quantities because units allow people to communicate amounts uniformly in a way that can be understood by others. Without units, a measurement cannot be understood -- if something costs 15, is it 15 cents or 15 dollars?
Why are units important when measuring quantities?
what to use measuring The length of a car
what to use measuring a single grain of rice
what would you use to measure the thickness of your textbook
what would you use to measure the distance from your house to school
Because both sets of units, English and metric, are commonly used in everyday life in the United States, understanding them both enables us to comprehend what others mean.
Why is it important to understand both English and metric units?
Grams are often used on nutrition facts labels. Miles are commonly used to indicate the distance between two cities in the United States. Liters are used to measure cola. Gallons are used to measure gasoline.
Give an example of a quantity that is often measured in metric units and a quantity that is often measured in English units.
One means the time at a specific moment; the other means a quantity of time, or the time interval between two events.
What are two different meanings of the word time?
Decide which variable should go on which axis.
Make a properly sized scale for each axis and number the axes.
Plot each data point with a dot.
Draw a smooth, best-fit line that shows the pattern of the dots.
Give the graph a title.
Summarize how to make a graph by listing the steps you would follow.
You wish to make a graph of the height of the moon above the horizon every 15 minutes betwee 9:00 p.m. and 3:00 a.m. during one night. What is the independent variable?
height of the moon
You wish to make a graph of the height of the moon above the horizon every 15 minutes betwee 9:00 p.m. and 3:00 a.m. during one night. What is the dependent variable?
time on the x-axis, angular position on the y-axis
You wish to make a graph of the height of the moon above the horizon every 15 minutes betwee 9:00 p.m. and 3:00 a.m. during one night. On what axis do you graph each variable?
It is believed that all events in nature obey a set of _______ that do not change
____ is the measure of the amount of matter in an object
a(n) _____ can help you understand the natural laws that relate matter and energy
when you formulate a(n) ______, you make an educated guess or prediction that can be tested by an experiment
____ properties are too small to be directly observed.
the _____ variable goes with the y-axis of a graph
what are the two categories we use to classify everything in the universe?
Physicists use experiments and analysis to better understand natural laws. Natural laws are developed and refined as more information is discovered.
How have physicists come to understand the natural laws?
Matter has mass and takes up space.
What property does matter have that energy does not?
no. Light is not matter because it does not take up space and it does not have mass.
is light matter? why or why not?
A system is a group of objects, effects, and variables that are related.
Define the term system as it relates to experiments.
You choose the system to include all the objects, effects, and variables that affect what you are trying to understand. The fewer the variables, the easier it is to find the cause and effect relationships.
When designing an experiment, how do you choose the system to investigate?
Observations of a system on a macroscopic scale can be seen and measured directly. An atomic scale is far too small to observe directly, but can give an understanding of the behavior of atoms and molecules.
Explain the main difference between the macroscopic scale and the atomic scale.
1) Ask a question
2) Formulate a hypothesis
3) Design a procedure to test the hypothesis
4) Conduct the experiment and collect the data
5) Analyze the data
6) Use the data to make a conclusion
7) If necessary, refine the question and go through each step again.
List steps of the scientific method
false. A hypothesis is an educated guess or prediction, not a random guess. You use the experience that you have with a system to come up with a good hypothesis.
A hypothesis is a random guess. True or false? Explain your answer
What do you call variables that are kept the same in an experiment?
Changing only one variable at a time while keeping all the other variables the same allows you to be certain that any change you see in the system is associated with the one variable you changed.
Why is it important to change only one experimental variable at a time in an experiment?
Independent variable: radius of the ball
Dependent variables: angle of the ramp, initial speed, mass of the ball, internal structure (hollow or solid), starting position, condition of the ramps surface.
You wish to do an experiment to determine how a ball's radius affects how fast it rolls down a ramp. List the independent and dependent variables in this experiment.
Systems tend to go from higher energy to lower energy. Systems at higher energy are more unstable than systems at lower energy.
Explain the role of energy in a system that is changing.
everything that exists
all the stuff in the universe that has mass and takes up space
measure of the ability to make things change. flows any time something gets hotter, colder, faster, slower, or changes in any other observable way
rule that tells you how or why something happens the particular way it does
situation that you carefully set up to see what happens under controlled conditions
detailed thinking you do to interpret and understand what you observe.
is air matter?
no, it's energy
is light matter?
factor that affects behavior of the system
group of objects, effects, and variables that are related
the scale when the things being measured are large enough for us to see or directly measure
the scale where the things being measured is too small to be observed and are on the scale of atoms
the variable that you change in an experiment, the variable that is the cause of the change in the system
the variable that shows/may show the effect of those changes is called the.......
how many meters to a km?
how many km to 1000 meters?
how many cm in a meter?
how many meters to 100 cm?
how many mm to a meter?
how many meters to 1000 mm?
how many mm to a cm?
how many cm to 10 mm?
is the amount of space between two points
explanation that links the variables in a system through cause and effect relationships
a precise value that tells how much
meters, cm, km, mm, inches, feet, yards, miles
distance is measured in units of.....
quantity of time
basic unit of time in both the English and metric systems
the independent variable goes on the _ axis
the dependent variable goes on the _ axis
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