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Physics 2010

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Submitted By prshehata42
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Pages 2
Name Pishoy Shehata

Projectile Motion

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

Pre Lab Reflections: What are the ● What forces are at play on a body under fall ? Under free fall, the only force acting upon an object is the force of gravity. But realistically, there is also the force of friction from the air (Air Resistance) that opposes the force of gravity. ●

Make a prediction of which angle results in maximum range.

Activity:
­ ­ ­ ­

Open the sim, projectile motion. Familiarize yourself with the variables shown there. Ensure the air resistance check box remains unchecked. Using the mouse set the angle of projection(i) to 5 deg. Alternatively enter the value in directly. Set the initial speed to a value U=15m/s . Click on Fire to start the projectile and record the corresponding value of the range R. Repeat with values i= 10,15,20,25,30,35,40,45,50,60,70,75,80,85.

­ ­ ­

­

Draw a graph of Range (R) against Angle of projection (i) You may want your lay out to appear like in the table. U=……… Angle (i) 5 10 15 20 30 35 40 45 50 55 60 65 Range(m)
9.7 12.2 14.9 17.5 21.8 23.2 24.0 24.1 23.6 22.4 20.6 18.1

70 75 80 85
­

15.2 11.65 7.81 3.92

From your graph, o Describe the shape of the graph obtained. Comment. o The graph has a maximum point and it opens downwards (n­shaped) o Determine using the graph the angle for maximum range. o Maximum range is at 45 degrees

Post activity discussion: Explain why there were differences between predicted and experimental value of range. What were the variables? How could variables be controlled? What conditions would optimize experimental values? How could experiment be improved? What other ways could projectile motion be tested?
The difference between predicted and the experimental value of the range wore insignificantly off. the predicted value wore my educated guesses. the values wore from 5 to 55 range. for angle of 5 i got a range of 5 and for the range of 30 i got range of 40. i also know for sure that starting at angle 45 the range should start decreasing again. The variables are controlled by the speed and angle at which the ball is through. The perfect condition to optimize this experiment will be in a vacuum. other ways to improve this experiment could potentially be by using other objects and different simulated systems .

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