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# The pendulum

Topic: Physics
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### Hypothesis

We believe the following are important for the pendulum oscillating:
• Air resistance
• Length of string
• Weight (w)
• Angle is released from

### Materials

• Stand
• String (various lengths)
• Different weights
• The cardboard pieces that drag
• Stopwatch

### Results

All results were performed by "5 oscillations" back and forth.

### Without air resistance

Length of string (cm) Weight on Weight (grams) Time (seconds) Number of degrees to face-off
47100 7:06 Not measured
47 20 7:28 Not measured
50 100 7:09 Not measured
50 20 7:18 Not measured
50 20 07:00 50 °
50 20 06:93 50 °
50 100 7:00 50 °
50 100 7:00 50 °
50 100 7:35 20 °
50 100 7:40 20 °
50 100 7:28 30 °
50 100 7:28 30 °
42 100 6:59 50 °
42 100 06:67 50 °
42 100 06:88 20 °
42 100 06:78 20 °
42 100 06:68 30 °
32 100 05:65 50 °
32 100 06:03 20 °
32 100 05:78 50
32 100 05:75 50 °
32 100 06:03 20 °
32 100 05:97 30 °
32 100 05:84 30 °
32 20 05:62 50 °
32 20 05:78 50 °

### With air resistance (made of cardboard)

Length of string (cm) Weight on Weight (grams) Time (seconds) Number of degrees to face-off
42 100 06:66 50 °
42 100 6:59 50 °
42 100 6:47 50 °

### Evaluation of hypotheses and experiments

According to our evaluation did not focus so important to the pendulum oscillating, this also applies to air resistance. Air resistance, we made a cardboard piece, perhaps it can slow down the speed of the pendulum if we had had a larger variant of the pendulum, but it did not significantly change in the oscillation period. But however we were right on two points of our hypothesis: that the length of the string and the number of degrees you release the weight off made a difference in the results. Although it differs little between the ages of results with different weights and air resistance, so we assume that this is only because you have not pressed the stopwatch at the exact same time (it differs only hundredths). We measured carefully each time so that it was exactly the same length of string and we dropped the weight from the same angle all the time. When we examined the various reasons we have had the same dimensions, weight and angle of everything else. So e.g. when we checked if the weight had no effect, we had the same length of string and the angle of release down all the time. We have measured with 5 "swinging" back and forth all the time just because we did not want the 1-second measurements, then it would be harder to see what the pen split time was due.

Thus, our conclusion in this trial that what is important for oscillating pendulum is what angle you release the weight off and the length of the string. I think the length of the string is very important because when the string is longer get the weight a longer path to move on and it will take longer. This is also the angle you release the weight off when you release it from the smaller angle (higher up), it receives a longer path to swing on and it takes longer. I do not think the weight is irrelevant because that when you drop down weight can quickly think if one has a greater weight than a smaller one but then when the weight is in a path on the way up and there is a greater emphasis needed more power and speed the pendulum slowed. If you then have a lighter weight so it goes slower on down the road but soon loader on the road because it does not need as much power. This means that you can say that they cancel each other at speed as they go at different speeds on different roads (down and up the road).

Anders Johansson

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### One Response to "pendulum"

1. Lisa on March 20, 2012 at 11:58 pm #

What do you mean by air resistance? What is it that you do with the box to reduce air resistance? :)