Motion in 2d Simulation

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Name ____________ Motion in 2D Simulation

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.

When you drag the red ball in a direction two arrows appear. One of the arrows is green and one of the arrows is blue. In the same direction that u drag the ball, the green and blue arrow point the same direction. After a second or two, the blue arrow changes to a complete opposite direction but the green arrow does not change. If I drag the red ball faster the arrows get longer and slower I drag the red ball the smaller the arrows.

2) Which color vector (arrow) represents velocity and which one represents acceleration? How can you tell?

The green arrow goes in the same direction that you drag the red ball and would therefore represent velocity. The blue arrow, at first, goes in the same direction that you drag the red ball. Then as the ball slows down the blue arrow changes and goes in the opposite direction, this would make the blue arrow acceleration.

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 I drag the red ball in a circle the green arrow becomes longer than the blue arrow, which is perpendicular to each other. As I drag the ball faster in a circle, each of the arrows becomes longer. If I keep moving the ball faster in a circle, the green arrow gets longer but then the blue arrow gets longer.

4) Now move the ball at a slow constant speed across the screen. What do you notice now about…...

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