Title: Force and Energy, Velocity and Acceleration, and Power
2. Purpose: The purpose of this lab is to understand and use Newton’s 2nd Law, The law of
conservation of energy, Velocity and acceleration, Power
3. Apparatus: The kit we were given was 20-25g of weight, small machinery (the Lego brain)
that would be able to pull the weight.
4. Procedure: We had 8 different trials that were separated into 2 parts. The first 4 trials were
had to change the power level and keep the same mass. For the other 4 trials were had to change
the mass but use the same power level. By doing so we would understand the Newton’s 2nd
Law, the law of conservation of energy, velocity, acceleration and power.
5. Analysis:
Newton’s 2nd Law- F-ma
Graph 1: Power level vs Acceleration
With a constant power level in graph one, we see that as the mass of the object increases the
acceleration decreases. Since there is more mass we need more power to pull the object.
Graph 2: Acceleration vs. Power Level
Having a constant mass and increasing power level increases the acceleration, because the more
power level and constant mass will need less power as power level is increasing and mass
continues to stay the same. So the acceleration does vary with the power level as long as the
mass of the object is constant.
Law of Conservation of energy
Graph 3: Battery discharge vs Mass (Kg)
As the power level is persistent we’re going to calculate the battery discharge according to the
mass or the object. The results show us that increasing the mass of the object, increases the
battery discharge.
Graph 4: Power Used (mgh/t) vs power Level
First you find the power used because the more power that is used the more increase we see in
the power level.
6. Theory:
Having done this experiment it easy to say that our group results agree with the laws of physics.
We understand Newton’s second law with our first two parts of the experiment. The results show
us that the bigger the mass the more power it will take to move the object. If we were to have a
constant mass and increase our power level that would increase the acceleration too. The last two
parts of the experiment illustrate the law of conservation of energy. In the first part of our second
law we kept a constant power lever and we increased the mass of the object leaving an increase
in battery discharge. The battery also drained faster with a constant power lever and an
increasing mass. The last part of the experiment proves that the more power used the higher the
power level. When calculating our number to find the results is a bit harder to understand but
after we had figured out what our final results were and made the graphs, it made a lot more
sense. The graph clearly displayed our results and made it easier to understand the size of one
object from the other and the dependence on one another. The only difficulties we came across
was our information that we plugged in, in order to create our graphs, wouldn’t download from
our email. It happened to each member of our group and we can figure out why.