Exploring newton’s 2nd law: energy that is not created or destroyed
The lab consisted of a pulley with weights of different masses that could be added or removed from the pulley. the system was connected to a computer program that could record our data in a precise way.
the purpose of this lab was to record three sets of data,
The first: Consistent P(power level) where the (M)mass and (A)acceleration changed
P(constant p)=ma
We set our power level consistently at 75
| speed/rpm | battery discharge | mass kg | power | time/sec | accel rpm/sec | ||||||
| 0 | 84.84117 | 0 | 69 | 0 | 0.2 | 0 | 75 | 0 | 1.658 | 0 | 51.17079 |
| 0 | 79.97257 | 0 | 28 | 0 | 0.18 | 0 | 75 | 0 | 1.215 | 0 | 65.82104 |
| 0 | 84.79766 | 0 | 28 | 0 | 0.16 | 0 | 75 | 0 | 1.252 | 0 | 67.72976 |
| 0 | 86.9883 | 0 | 69 | 0 | 0.14 | 0 | 75 | 0 | 1.368 | 0 | 63.58794 |
as you can see from this data by changing our mass, the acceleration changed due to the constant power
when mass was added in kg to the pulley system the acceleration rpm/sec decreased the opposite effect is also true
Second: Consistent (M)mass where the (P)power level was the variable and the (A)acceleration changed.
P=m(constant mass)a
| speed/rpm | battery discharge | mass kg | power | time/sec | accel rpm/sec | ||||||
| 0 | 91.50964 | 0 | 41 | 0 | 0.1 | 0 | 75 | 0 | 1.539 | 0 | 59.46045 |
| 0 | 58.56471 | 0 | 55 | 0 | 0.1 | 0 | 50 | 0 | 2.197 | 0 | 26.65667 |
| 0 | 46.78363 | 0 | 41 | 0 | 0.1 | 0 | 40 | 0 | 3.135 | 0 | 14.92301 |
| 0 | 24.77517 | 0 | 55 | 0 | 0.1 | 0 | 25 | 0 | 5.745 | 0 | 4.312475 |
As we decreased the power with the consistent mass of 0.1 kg the acceleration decreased and the amount of time needed for the weight to be pulled to the top was longer.
Mass is the blue line and is constant, the red shows the acceleration decreasing in a negative correlation as we changed the power levels
Third: we measured the potential energy w=by measuring the mass time grams times height
Po=MGH
our height was .26m
G= 9.8
Our mass was the variable
| speed/rpm | battery discharge | mass kg | power | time/sec | accel rpm/sec | ||||||
| 0 | 37.34324 | 0 | 41 | 0 | 0.12 | 0 | 35 | 0 | 4.173 | 0 | 8.948775 |
| 0 | 42.61228 | 0 | 69 | 0 | 0.14 | 0 | 40 | 0 | 3.481 | 0 | 12.24139 |
| 0 | 47.4741 | 0 | 55 | 0 | 0.16 | 0 | 45 | 0 | 3.121 | 0 | 15.21118 |
Our first potential energy was .049
Second: .10
Third: 0.13
We could compare our results to the battery discharge in column two of our data
After we recorded this data and graphed the data points to show the relationship between our variables and constants in the experiment.
In conclusion, this lab showed us how much potential energy and battery power was used to pull the weights at different masses and power levels we also saw what happened to acceleration when power levels stayed the same and when mass stayed constant as well. these data points mapped out on a graph help understand Newton’s second law of motion that energy is neither created or destroyed by showing us how this energy was displaced and used.
The struggles for me durring this experiment was graphing the data points, it was easy to understand the formulas surrounding acquiring the data but less easy to understand plotting the points on a graph. Unfamiliarity with the program certainly posed a threat to my partner and I durring this experiment. Overall I think I have a firm grasp of the main concepts and Newton’s Law of motion.