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course Phy 201
6/22 9
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?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?
How do you think the acceleration and velocity vectors would behave for this motion?
Submit a copy of your results and insights using the Submit Work Form, with title 'Cannonball Motion'
When I hold my finger straight up, it slows down when the projectile reaches the top, then goes faster when it is going back down.
When I hold my finger horizontally and track the motion of the object, my finger stays in a constant motion.
I interpret this to mean that my vertical finger represents velocity, which changes as the object goes up and back down. When my finger is horizontal, I believe this represents the acceleration of the projectile because it stays constant, representing the fact that acceleration due to gravity that is acting on the ball remains constant.
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The horizontal finger relates to the constant horizontal velocity of the porjectile. Its horizontal velocity doesn't change, so its horizontal acceleration is zero.
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