energy and rollercoasters foundations of physical science
TRANSCRIPT
Energy and Rollercoasters
Foundations of Physical Science
Energy and Systems
Work and Energy
Energy and the Rollercoaster
Waves and Energy
Sounds and Energy
Key Questions
How do we measure and describe the world around us?
What is the difference between accuracy and precision?
CPO Data Collector
Home Window
Stopwatch Window
Time and Distance 1.1 How can we measure time accurately?
— Using the timer in stopwatch mode, who can get the fastest time?
— CPO Record = .04 s
— How precise are you?— How accurate is our stopwatch?
Answer: to the nearest 1/100th of a second
CPO Timing System
• 100 meter race?– One runner has a time of 10:01 s.– Another runner has a time of 10:02
s.
– Who WINS?
• How can we measure time accurately?
– Use the timer in stopwatch mode– Who can get the fastest time?
Application
Examine a photogate
clam p screw
refe rence m ark
status light
connect cord here
th readed hole
ho le for the light beam
Time Measure
ment
Plug one end of phone cord into the photogate, and the other end into slot A of the timer.
Turn on the “A” light
How does the photogate operate the timer?
NOW see who can get the shortest time to display!
CPO Timer Benefits
Photogates measure to nearest 1/10,000 (Student data is ACCURATE)
Photogates and CPO Timers allow quick, repeatable data collection (Student data is PRECISE)
Error on graphing and statistics is reduced from 25-30% less than 5% error.
Key Questions What happens to the motion of a marble on a hilly track?
How is energy conserved on a roller coaster?
http://www.rcdb.com
Fastest Coaster
Kingda Ka
Six Flags Great Adventure
Jackson, New Jersey
128 mph
5/21/2005
Where does the marble move the fastest?
Investigate Motion of Marble
How long does it take the marble to break the photogate beam at each of the 7 positions?
Do smaller times correspond to faster or slower speeds?
Where did the marble move the fastest?
How would you calculate the speed?
0
At what two positions is the marble moving the fastest?
What is unique about these two positions?
Let’s investigate the relationship between speed and height more closely Find the speed of the marble for
each of 12 different positions on the coaster
Use the table provided to record your data (note: you don’t have to measure height of marble)
When finished, please complete the speed vs. position graph
COOL GRAPH!
What questions do you have about the CPO Science Curriculum?