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Knex 78890 - Education Amusement Park Experience Teachers Guide Manual

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LESSON 6
6: E
6: E
XAMINING
XAMINING
C
C
IRCULAR
IRCULAR
R
R
IDES
IDES
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Teacher’s Notes
• This activity provides an excellent opportunity to discuss experimental error. Will the timing results be
more accurate if students time one turn of the ride or many turns of the ride? Help students to realize
t
hat any timing errors on a single turn will have a large effect on the speed of the ride, while the same
error will have a much smaller effect if five turns of the ride are timed.
c. Determine the time it takes for 10 revolutions, 15 revolutions, and 20 revolutions.
d. Calculate the speed/velocity of the ride.
v = d/t
Where: d = 5 times the circumference of the path the seats take during a revolution
t = the time for 5 revolutions of the ride
e. Complete the chart below: (Remember, the numbers in the distance column increase by 5
times the circumference as you move from 5 revolutions to 10 to 15, etc.)
Number of
Revolutions
Time
(sec)
Distance
(m)
Speed
(m/sec)
5
10
15
20
TABLE 1
f. Record all measurements and calculations in individual science journals.
3. Repeat steps 2b through 2e with the addition of:
a. One ‘rider’ (battery) in each seat.
b. Two ‘riders’ in each seat.
4. Prepare a graph to show your speed/velocity data.
a. x–axis - List ‘Empty Car,’ ‘One Seat Filled,’ and ‘Two Seats Filled.’
b. y–axis - Velocity/speed of the ride.
5. Students should draw conclusions about what happens to the speed of the ride as more mass
is added.
a. How fast did the ride move when it was empty? With one rider per seat? With two riders
per seat?
b. What information did your chart provide?
c. Describe any trend that you notice as you read your data.
d. Describe how your graph demonstrates the reaction of the ride’s speed to the added mass.
… 38 …


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