University of South Alabama Conservation of Energy Questions

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Science

University of South Alabama

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I need help with the excell and the discussion questions I need it by 11:59 tonight , please try to explain every de

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19 periment Comment of Energy Experiment 4 Conservation of Energy 4.1 Introduction There are two types of mechanical energy: kinetic, having to do with an object in motion, and potential, having to do with the potential" for an object at rest to do mechanical work. In our last experiment, we studied an example of potential energy. This kind of energy is called gravitational potential energy, since gravity is performing the work in moving the car from a higher level to a lower level. In this experiment we want to study kinetic energy, and to see if we can demonstrate the conservation of energy principle: the sum of the energy, kinetic + potential in an idealized experiment remains constant. We will see that there are often other factors at work as well, such as friction. 4.2 Theory The kinetic energy (KE), or energy of motion, of an object is given by a simple equation: KE= - mv where m is the mass of the moving object, and v is its velocity. It should be said that this equation holds true for all masses in the Universe that move with speeds that are much less than the speed of light (3 x 108 m/s, or 186 000 miles/s) - this includes virtually everything except for subatomic particles. Combining this formula with the one we had for the gravitational potential energy (Experiment 3), we can set up a situation where a body initially has only potential energy (it is at rest), then converts that potential into kinetic energy at the end of its travel down an incline. If energy is conserved (and if frictional losses are ignored), then: PE = KE → mgh 2 my2 Imagine an inclined plane along which an object is released and moves downward (pulled by gravity), converting its potential energy into kinetic energy. This object will use the velocity it has acquired to reach the end of the slope and move though the air a distance R, from a height H. If we apply this situation to the equations above, it can be shown that the kinetic energy can be calculated from this range and height information as: mgR? KE 4H In this exercise, you will compare the potential and kinetic energy values for an object, and determine whether energy is truly conserved.
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Discussion Questions
h (cm)

R1 (cm)

R2 (cm)

R3 (cm)

Ravg

1

10

40

39

40

39.7

2

4.5

32

38

33.5

34.5

3

12.5

55.5

53

52

53.5

4

16

58

60

56

58

H1 (cm)
H2 (cm)
H3 (cm)
Havg

76.7
76.9
76.5
76.7

Mass of car = 32.3 g
1
2
3
4...


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