Physics

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Submitted By smbible90
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Go to http://phet.colorado.edu/simulations/sims.php?sim=Motion_in_2D and click on Run Now.

1) Once the simulation opens, click on ‘Show Both’ for Velocity and Acceleration at the top of the page. Now click and drag the red ball around the screen. Make 3 observations about the blue and green arrows (also called vectors) as you drag the ball around.
Observation 1: When the ball is first dragged both arrows go in the same direction.
Observation 2: After the ball is forced to stop the blue arrow will change direction in the opposite direction (move from going forward to going backward and vice versa) while the green arrow continues in the same direction.
Observation 3: The arrows reach equal length before the ball slows down to a stop.

2) Which color vector (arrow) represents velocity and which one represents acceleration? How can you tell?
Green represents velocity and blue represents acceleration. I can tell because the green arrow (velocity) displays the speed and direction of the ball whereas the blue arrow (acceleration) displays the change that has occurred in the balls velocity whether it is the change in speed or direction or both.

3) Try dragging the ball around and around in a circular path. What do you notice about the lengths and directions of the blue and green vectors? Describe their behavior in detail below.
When the ball is moving in a constant circular path the green (velocity) arrow is longer than the blue (acceleration) arrow. However, when the ball is moved in an inconstant circular path the blue arrow (acceleration) is longer than the green arrow (velocity). This is because when the ball is moving it accelerates faster by changing its velocity and the green arrow displays the velocity of the ball which is the change in the speed and direction of the object.

4) Now move the ball at a slow constant speed across the…...

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