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course phy 201
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 speeds up then slows down and then speeds up again.
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 speeds up at the beginning but then slows down toward the apex. My finger then speeds up on the downward slope
How do you think the acceleration and velocity vectors would behave for this motion?
acceleration and velocity would be similar at first moving toward the apex but then as it neared the top the acceleration would point down and the velocity would shrink. Then they would both point toward the ground on the downward slope.
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Good.
Note that the acceleration is constant. The acceleration vector always points downward. Its effect on a rising object, whose velocity vector is upward, is to slow it. The effect on a falling object, whose velocity vector is downward, is to speed it up.
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