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Explain how you know which kinds of energy are at each location.

I know that there is only gravitational potential energy at location A since the marble isn’t moving yet so there is no kinetic energy, and there are no pull or push forces acting on the marble so there is no elastic energy.

I know that there is kinetic, gravitational potential, and dissipated energy at location B since the marble started moving, resulting in some kinetic energy. Also, the marble is inside a loop, which means that the marble is not on ground level, resulting in some gravitational potential energy. Since there is friction between the marble and the track, there is some dissipated energy, resulting in the loss of 55% of our initial energy.

I know that there is kinetic, gravitational potential, and dissipated energy at location C since the marble is moving, resulting in a small amount of kinetic energy, 55% of the kinetic energy at location B. Also, the marble is going over a bump, which means that the marble is not on ground level, resulting in a small amount of gravitational potential energy since the bump is only 2cm tall. Since there is friction between the marble and the track, there is a lot of dissipated energy, resulting in the loss of 55% more energy than at location B.

Describe how energy is transferred between forms from location A to location B, and from location B to location C. Identify the forces responsible for these transfers of energy.

From location A to location B, all of the gravitational potential energy transfers into kinetic, gravitational potential, and dissipated energy. Due to gravity pulling down on the marble, the marble rolls down the ramp, which results in a transfer of gravitational potential energy to kinetic energy. As the marble is rolling down the ramp, friction is causing some of the kinetic energy to be transferred from kinetic energy to dissipated energy.

From location B to location C, 55% of the marble’s kinetic energy is transferred into dissipated energy since friction causes the marble to loose 55% of its energy, and the longer the marble is on the track, the more energy it will loose. The marble’s gravitational potential energy is lowered drastically since the bump it needs to get over is only 2cm in comparison to the 14cm high loop. The difference in gravitational potential energy is transferred into kinetic energy. Since the marble’s kinetic energy is larger, the dissipated energy is also larger.

 

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For our rollercoaster, the scale was 1 box = 2 cm and the mass of the rollercoaster was 500 grams. There were 3 points in the rollercoaster, and different energies used. The initial height of the roller coaster is 70 cm. Then at point B, it’s 14 cm, then at point C, the height was 2 cm. The percent loss of the rollercoaster was 55%. To find the percent loss, we used the equation Position A – Position b/c / Position A.
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While developing our rollercoaster, we had people hold the rollercoaster at different sections to make it more stable. The previous benchmarks helped because we made the equations to find the Ediss. By finding the Ediss we were able to successfully plan a rollercoaster that would work. The percent loss was pretty accurate since we experimented with the same initial height and also went through the whole track.

One way that our group knew that our marble would be able to make it through the whole track was making sure that location B was at least 55% shorter than the initial start height location A. Also location C had to be at least 55% shorter than location B in order for the marble to make it over the hill. Since the initial start height is 70cm and the height of the loop is only 14cm, the marble will be able to go through the loop since 55% of 70 is 38.5, meaning that the marble can go through a loop that is 38.5cm or smaller. The marble will go over the hill since the loop is 14cm, while the hill is 2cm. 55% of 14 is 7.7, meaning that the marble will be able to go over a hill that is 7.7cm or lower.

 

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