On Monday, we did a measurement lab in class. We used a pulley system to raise .25 kg. While raising this mass we looked at speed which was measured in rotations per minute, power setting, time which is measured in seconds, and acceleration which is measured in rotations per minute divided by seconds.
We compared batter discharge vs. mass. One would think that the more mass the pulley was lifting, the more battery discharge would happen. However, it was the exact opposite. The higher the mass, the less battery discharge that happened. The reason for this is because when there is less mass, the pulley is going faster which in turn creates more battery discharge.
The second relationship we looked at was the relationship between power and time. The more power that had to be expended, the more time it took the mass to be lifted to a certain height. This makes sense because the more power that has to be used the heavier the mass is which means the longer it will take for the mass to reach a certain height.
Another relationship that was graphed was the relationship between acceleration and power. The faster the mass accelerates, the more power that is used. The graph shows this exact relationship.
The last relationship that was looked at was the relationship between acceleration and mass. Common sense tells us that the faster the acceleration, the lower the mass being lifted. The graph shows this by having a downward slope from the highest acceleration coming from the lowest mass and the slowest acceleration coming from the highest mass.
The following link will show you the graphs and lab.