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course Phy 121
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'
My finger begins speeding up (firing from the cannon) then it slows down as it reaches it peak (top of the vector), then speeds up again as it falls to the ground. Comes down faster at the end due to acceleration due to gravity.
Range: 26.7 m
Height: -1.2 m
Time: 3.9 sec
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This is a valid description for the vertical motion.
You should also have found that if you trace the horizontal motion only, your finger neither speeds up nor slows down.
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