ROLLERCOASTER EXPERIMENT REPORT
To investigate energy changes in a rollercoaster and to identify the relationship between Kinetic Energy and Gravitational Potential Energy
Some material is set up to a rollercoaster in this experiment. The first part of this experiment is being done with keeping the same initial heights and repeat 5 times while changing the shape of the track; and there are two retort stands are used with repeating the experiment for 5 different initial heights during the second part of this experiment. Rollercoaster is a steep, sharply curving elevated railway with small open passenger cars that is operated at high speeds as a ride, especially in an amusement park. Furthermore, there are two forces of a rollercoaster while it is doing work: Gravitational Potential Energy and Kinetic Energy. Gravity is the driving force of a rollercoaster, Gravitational Potential Energy is energy an object possesses because of its position in a gravitational field; Kinetic Energy of an object is the energy which it possesses due to its motion. But for a non-idealized roller coaster system, not all of the energy is conserved. Friction is the main cause of energy leaks in the system and the reason why mechanical energy is not fully conserved for a real roller coaster.
In the first part of the experiment, I believe that the velocity becomes slower and Kinetic Energy becomes bigger when the track shape changes and
2becomes bigger because Kinetic Energy’s formula is KE=1/2mv, Kinetic
Energy’s change depends on velocity’s change, although all of the initial
heights are the same; and in the second part of the experiment, I think Gravitational Potential Energy becomes bigger and bigger regularly when the initial height becomes higher and higher, because Gravitational Potential Energy’s formula is GPE=mgh, the Gravitational Potential Energy’s change
depends on height’s change when every time experiment has the same mass.
m= 5.0g= 0.005kg
trial h /m GPE /JVelocity m/sKE/J calculated i i
from the velocity Track Shape1 0.25 0.01225 Track Shape2 0.25 0.01225 Track Shape3 0.25 0.01225 Track Shape4 0.25 0.01225 Track Shape5 0.25 0.01225
trial h /m h /m GPE /J GPE /J GPE/J – GPE/J ifififTrial1 0.45 0.25 0.02205 0.01225 0.0098 Trial 2 0.35 0.2 0.01715 0.0098 0.00735 Trial 3 0.25 0.16 0.01225 0.00784 0.00441 Trial 4 0.2 0.12 0.0098 0.00588 0.00392 Trial5 0.15 0.09 0.00735 0.00441 0.00294
Evaluation of the method (improvement):