B.

2.
Collect data
: Find the final speed of a toy car in each situation. Leave the last column blank.
Hill 1
Hill 2
Hill 3
Final speed
Total Height
Loss
40 cm
0 cm
0 cm
280.1 cm/s
40 cm
40 cm
30 cm
0 cm
280.1 cm/s
40 cm
60 cm
50 cm
20 cm
280.1 cm/s
40 cm
60 cm
0 cm
0 cm
343.1 cm/s
60 cm
60 cm
45 cm
0 cm
343.1 cm/s
60 cm
90 cm
75 cm
30 cm
343.1 cm/s
60 cm
3.
Analyze
: Look at the data carefully. Notice that it is organized into two sets of three trials.

B.
.

C.
Label the last column of the table
Total height lost
. Fill in this column by subtracting
the height of hill 3 from the height of hill 1.
D.
What do you notice about the
Total height lost
in each set of trials?

4.
Draw conclusions
: When there is no friction, what is the
only
factor that affects the final

What factors do
not
affect the final speed of a roller coaster?

Activity B:
Energy on a roller
coaster
Get the Gizmo ready
:
● Click
Reset
. Select the 50-g car.
●
Check that the
Coefficient of friction
is 0.00.
● Set
Hill 1
to 100 cm, and
Hill 2
and
3
to 0 cm.
Question: How does energy change on a moving roller coaster?
1.
Observe
: Turn on
Show graph
and select
E
vs
t
to see a graph of energy (
E
) versus time.
Click
Play
and observe the graph as the car goes down the track.
Does the total energy of the car change as it goes down the hill?
No
.
2.
Experiment
: The
gravitational potential energy
(
U
) of a car describes its energy of
position.
Click
Reset
. Set
Hill 3
to 99 cm. Select the
U
vs
t
graph, and click
Play
.
A.
What happens to potential energy as the car goes down the hill?