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Name ___________Anna Marie Herbold_________________________ Motion in 2D Simulation

Go to HYPERLINK "http://phet.colorado.edu/simulations/sims.php?sim=Motion_in_2D" 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.

1. The green vector seems to be always longer than the blue vector.
2. When the ball is moved quickly, only the blue vector travels forwards and backwards. The green only travels forwards.
3. If you drag the ball slowly around, the green vector is visible but the blue vector seems to disappear.

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

Acceleration is the green vector and velocity is the blue vector. For example, when you drag the ball slowly the blue vector is hardly seen because there is very little velocity when moving at a slow pace. The green vector is seen because this is acceleration which is a change in speed, which is happening at even a slow pace.

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.

The lengths of the vectors seem to be close to the same length but the object is constantly changing its direction. The ball is moving tangent to the circle and the velocity vector is tangent to the circle as well. The ball is moving in the same direction as the velocity vector. The ball is undergoing a constant acceleration in this uniform circular motion. It is acceleration because it is changing direction, and the direction is

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