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course Phy 121
This is a resubmission. I first submitted this sometime before 9/22. I haven't seen it posted yet, so I am resubmitting to ensure that you got it.Thanks!
9/25 9pm" " Physics I Assignment 08: Set the cannon to fire at 70 degrees, at 20 meters / second. Hold your index finger straight up and move it from left to right, keeping it just ahead of the projectile. Try this a few times until you get the 'feel' of the left-to-right motion (click the 'erase' button between trials so you can see the motion). Does your finger speed up or slow down?
My finger seemed to keep a steady constant motion as it moved left to right. It could be that I subconciously figured it was supposed to be constant, but I'm pretty sure it was constant.
Now hold your index finger horizontal, parallel to the floor, and similarly trace the up-and-down motion of the projectile. Does your finger speed up or slow down, and if so where does it do each?
My finger kept getting slower until the apex and then sped up as the projectile fell back to the ground.
How do you think the acceleration and velocity vectors would behave for this motion?
Assuming a similar visual model to what we saw in the Ladybug Motion simulation, there would be a large, fast but gone in almost an instant positive acceleration vector followed by a negative acceleration vector that would remain constant until the projectile landed.
The velocity vector would begin with a long arrow and slowly decrease to nothing and then begin to grow rapidly until it abruptly disappears at impact.
Submit a copy of your results and insights using the Submit Work Form, with title 'Cannonball Motion'
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The acceleration vector is in fact constant for this motion.
It would be possible with the ladybug simulation to try to move the ladybug up then down in a manner similar to the vertical motion in this simulation, keeping the acceleration vector constant. Of course you wouldn't be able to manage an absolutely constant acceleration, but you could at least keep the acceleration vector pointing down.
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Thanks for resubmitting. I'm not sure this is the explanation (could be that I'm missing a file) but it seems that once in awhile the form doesn't convey the identifying information. I'll be asking our tech support people about this occasional malfunction.
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