Energy Conservation Lab Name:
Use SI Units Lab Partner(s):
Part 1: Cart rolls downhill
Include all calculations as formulas in the worksheet cells
Trial v meas. Roll Dist. ΔU+ΔK (J)U+ΔK (J)ΔU+ΔK (J)K (J)
1 0.042 0.117 1.19 0.9 0.2058 0.5733 0.354025 0 -0.013475
2 0.042 0.117 1.18 0.9 0.2058 0.5733 0.3481 0 -0.0194
3 0.042 0.117 1.18 0.9 0.2058 0.5733 0.3481 0 -0.0194
4 0.042 0.117 1.19 0.9 0.2058 0.5733 0.354025 0 -0.013475
5 0.042 0.117 1.18 0.9 0.2058 0.5733 0.3481 0 -0.0194
Average 0.042 0.117 1.184 0.9 0.2058 0.5733 0.35047 0 -0.01703
Part 2: Cart is pulled uphill
Trial v meas. Roll Dist. ΔU+ΔK (J)U+ΔK (J)ΔU+ΔK (J)K (J)
1 0.1 0.04 1.21 0.77 -0.2646 0.196 0.43923 0 -0.02137
2 0.1 0.04 1.21 0.77 -0.2646 0.196 0.43923 0 -0.02137
3 0.1 0.04 1.21 0.77 -0.2646 0.196 0.43923 0 -0.02137
4 0.1 0.04 1.21 0.77 -0.2646 0.196 0.43923 0 -0.02137
5 0.1 0.04 1.2 0.77 -0.2646 0.196 0.432 0 -0.0286
Average 0.1 0.04 1.208 0.77 -0.2646 0.196 0.437784 0 -0.022816
Questions to Answer During Lab:
How accurate was the initial assumption that frictional losses would be a small percentage of the overall energy transfer?
The initial assumption of the frictional losses was very accurate to be exact it was a small percentage of 4% of the overall energy transfer.
List the two or three most significant sources of error in this experiment. Describe how you attempted to minimize these:
Yfinal Yintial Ufinal (J) Uinit (J) Kfinal (J) Kinit (J)
Yfinal Yintial Ufinal (J) Uinit (J) Kfinal (J) Kinit (J)
The two most significant sources of error in this experiment would happen to be the possibility of the table being unevenlly balanced which
could be blind to the naked eye. Another significant source of error In the experiment will be the air resistance in the room which could cause
the possible 4% difference.
Estimate the effect of these errors on the final calculation of energy conservation (using your estimated uncertainty for each one):
The effect of these errors on the final calculation of the energy conservation would cause an uncertainty for each one of the final calculations
which would give a uncertainty final calculation of 4 % . It shows us that there is a 4% loss of energy of the friction that occured within the
experiment.
