#$&*
course PHY 201
2/25 415am
PhET Explorations: Motion in 2DTry the new
ball with the mouse or let the simulation move the ball in four types of motion (2 types of linear, simple harmonic, circle).
Figure 3.51 Motion in 2D ( http://cnx.org/content/m42045/1.7/motion-2d_en.jar )
Physics I Assignment 07: Move the dot straight from the left of the screen to the right, taking a few seconds to complete the motion. Which vector represents the velocity, and which represents the acceleration? When is the acceleration vector longest? When is the velocity vector longest? When do the vectors have the same direction, and when are their directions opposite?
Repeat but move the dot as quickly as possible from left to right. Describe the behaviors of the two vectors.
Now start in the upper left-hand corner, moving at first to the right, but as you continue to move to the right gradually begin arcing downwards so that you follow a graceful (?) curve from upper right to lower left. Describe the behavior of the velocity and acceleration vectors.
Now move the dot around a circular path. Follow a slow circular path, then try to double your speed along the same path. How does the direction of the acceleration vector compare with that of the velocity vector? If you double the speed, then what happens to the magnitudes of the velocity vector and the acceleration vector?
Submit a copy of your results and insights using the Submit Work Form, with title 'Ladybug Motion'.
#$&*
The blue vector is accelleration and the green vector is velocity. Acceleration is longest when the dot is 'decelerating' or when it approaches the sides of the screen. Velocity is the longest as the dot approaches the end of the screen. The vectors move in the same direction as the dot is increasing acceleration and opposite directions when the dot is slowing down to change directions.
When the speed at which I move the dot increases, the length of the vectors increases. The behavior is similar to when the dot was moving slowly, however the movements of the vectors are more exaggerated.
As the dot begins to move in a horizontal manner, acceleration and velocity vectors are moving in the same direction, then when the dot begins to arch towards the bottom of the screen, the vectors are moving in different directions; acceleration begins to move opposite or even to a different angle of velocity.
When in a consistent circular motion, the green vector points in the direction that the dot is travelling and the blue vector is pointing 90 degrees from the green vector towards the center of the 'circle' also at a consistent length when the speed of circular motion is consistent.
If speed is doubled, the magnitudes of the vectors increases."
@&
Very good. Thanks for submitting this.
*@