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course phy201
Figure 3.51 Motion in 2D ( http://cnx.org/content/m42045/1.7/motion-2d_en.jar )Physics I Assignment 07: Move the dot straight from the left of the screen to the right, taking a few seconds to complete the motion. Which vector represents the velocity, and which represents the acceleration? When is the acceleration vector longest? When is the velocity vector longest? When do the vectors have the same direction, and when are their directions opposite?
The velocity is green, the acceleration is blue. The acceleration is the longest when there is a quick change in speeds, velocity is the longest when you move the ball fast.The arrows are the same when the ball is positively accelerating with increasing speed. The arrows are opposite when the ball is positively accelerating but at a negative speed.
Repeat but move the dot as quickly as possible from left to right. Describe the behaviors of the two vectors.
The two vectors start going the same way but then go opposite directions
Now start in the upper left-hand corner, moving at first to the right, but as you continue to move to the right gradually begin arcing downwards so that you follow a graceful (?) curve from upper right to lower left. Describe the behavior of the velocity and acceleration vectors.
The vectors are sometime in opposite directions and sometimes in a perpendicular shape
Now move the dot around a circular path. Follow a slow circular path, then try to double your speed along the same path. How does the direction of the acceleration vector compare with that of the velocity vector? If you double the speed, then what happens to the magnitudes of the velocity vector and the acceleration vector?
When you just move the ball in a circular path, the green arrow is longer (velocity) but as you speed up in the circle the vectors become closer to the same length.
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Good.
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