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course PHY 201
3/3 about 3 pm
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?This one was more difficult to determine but I believe it slows down. I was going to say that it remained constant at first, but I did it a few more times and I believe that it slows down.
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It's hard to tell without measurements, but if the simulation is accurate, as I believe it is, your finger's velocity would remain constant.
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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?
It was much slower at the top of the curve. Near the ground it was much faster.
How do you think the acceleration and velocity vectors would behave for this motion?
I would say that the velocity vector would be in the direction of motion and the acceleration vector would be point towards the ground at the point directly below the top of the curve.
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The acceleration vector would in fact point straight down at every point, as the horizontal velocity remains constant.
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