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course Phy 241
12/7 10:30
Magnet affect of a steel ball with varying velocityNow this lab was one of those things where you told me to come up with a cool idea, and I did, and then you made me (and i think adam) do this for a lab.
we had our handy 30cm long ramp, a large steel ball, and one large magnet, dominoes (3 large and 1 slim, the slim domino is the 1/2 part)
We measured how far the ball would go rolling from the top of the ramp from rest, off the table, and onto the floor. (table i think is 89 cm tall)
our magnet was placed under the ramp so it was resting on it, and it was 8cm from the end of the ramp. Ramp end was exactly at end of the table.
Dominoes | Time | Length
(under ramp for slope) (no magnet) (with mag) (no mag) (with mag)
1 1/2 14.3s 16.5s 9cm 8.25cm
2 8.1s 9.7s 12.5cm 10.5cm
3 5s 5.3s 18cm 20.5cm
This is extremely interesting because I would think that the magnet would slow it down, but after knowing a little bit more, I can understand that the magnet has a force pulling it into its center, and that force coupled
with the velocity it already had, made it have an exit force greater than it would have with just rolling with no magnet. because you can see on the ramp with 3 dominoes, it went further with the magnet.
I made a graph of this, distance vs time. with and without magnet. again the graph is very intersting. "
Self-critique (if necessary):
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Your reasoning is good. However note that on the first two trials, according to your results, the presence of the magnet had the opposite effect.
I wonder if the increasing initial velocity of the ball could cause the effect to change.
The ball would have spend perhaps a second in the vicinity of the magnet on the first trial, about 1/3 that time on the last. So the magnet would have exerted less net impulse on the last trial than on the first.
It's worth a little extra thought, but you don't neet to follow up on this one unless you just can't help yourself.
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