Measuring the velocity of various objects in freefall

Purpose:

The purpose of this experiment was to measure the velocity of various objects in freefall. Upon completion of this lab one will be suit subject to calculate the values for acceleration and the effect of wrinkle resistance.

Apparatus:

2m fix plastic tube

Acculab sonic ranger (speed of sound = 343 m/s period = 0.03 seconds)

SensorNet software

Macintosh computer with system 6.07 or later

Blank 3.5 HD Macintosh formatted disk

Electronic intensity scale, calipers

Various objects to drop

Procedure

For the first gear part of sample 1 we dropped three objects of the corresponding shape, but of varying good deal. To promote accuracy, we performed three trials for each object. The first object we dropped was a 301 gram clump of radius 1.85 cm, followed by a 225 gram ball with radius 1.82 cm, and finally a 20 gram ball of radius 1.81 cm. From this information we were able to derive the mass densities of the objects.

mass density = mass/((4/3)pR3 )

We recorded the germane(predicate) data and evaluated the average acceleration by means of the vend of the velocity graph.



From the following equation we determined the magnitude of the scratch force acting on the object:

Force net = mass x acceleration = Force gravity + Force air resistance

Next, we calculated the errors and uncertainties:

mean = 1/N [t1 + t2 + ... + tN] º 1/N S ti

s = [1/N S (mean - ti )2]1/2

For the next part of Experiment 1, we simply conducted three trials for a ping pong ball of mass 20 grams and radius 1.81 cm. We followed the same basic use as above. Upon completion of three trials, we compared the data collected for the soft object with that of a heavy object.

The method used in Experiment 2 is a lot...

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