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| Topics: Projectile motion, ballistic motion,
velocity, acceleration, constant acceleration, gravity, freely falling body. Pre-requisite skills: An understanding of the kinematic equations of motion for constant acceleration. Approximate completion time: 30 minutes. |
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Provide sufficient detail to verify that the assignment was completed in a meaningful manner. |
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Applet by Angel Franco Garcia |
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| Set inital vertical position (Posicion) of the projectile to
+100 meters and the initial velocity to 50 m/s. Press the Start (Empiaza)
button. Once the projectile has reached the ground level (y = 0), press the Pause
(Pauso) button. 1. One of the kinematic equations of motion is x = vot + (1/2) a t2. Using the displayed data, compare the numerical values for the left side of this equation to the right side of the equation. (Warning: The displayed data refers to the vertical properties of motion, that is, the physical properties of the black dot on the left side of the applet.) Use a percent difference to compare the two. Is this percent difference reasonably small? 2. You will notice that nowhere is the initial angle of elevation specified. From the data shown at the top of the applet, and the horizontal distance traveled (indicated by the ruled axis), calculate the initial angle of elevation. 3, To test whether the angle you just calculated is correct, predict how far the projectile will travel if the initial velocity is changed to 60 m/s. Run the applet to verify your prediction. Describe the accuracy of your prediction using a percent error analysis, with your predicted value used as the true value. |
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