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Period _____ Name ________________________ Number _____ MOTION OF A WATER BALLOON Application Purpose - The purpose of this activity is to calculate the bow velocity of a balloon and predict the maximum range (horizontal distance) that the balloon will travel. Materials - Balloons, Winger, Stopwatches, Tape measure, Trundle wheel and Calculator. Procedure - Using concepts you have just studied, it should be possible for you to calculate the bow velocity and the maximum range of a balloon. Because of the possible dangers, this will be demonstrated for the class under close supervision of the teacher. You MUST show all of your calculations. Part 1 Measure the total travel time for a balloon shot straight up. Perform the experiment three times and record and average the times. Fill in the known information and calculate all of the unknown information in the table below – you must show all of your work. Time 1. _______s. 2. _______s. 3. ________s. Vertical Distance (m) Average ________s. 1/2 way ---------- Time (s) Velocity initial (m/s) Velocity final (m/s) Acceleration (m/s/s) -9.81 -9.81 Calculations. 1 Part 2 Using the bow velocity from part 1 draw a velocity vector diagram and complete the following table for firing the balloon at 45 degrees above the horizontal for maximum range. You MUST show all of your calculations. Diagram Horizontal Distance (m) Vertical 1/2 way ------------- Time (s) Velocity initial (m/s) Velocity final (m/s) Acceleration (m/s/s) ------------- -9.81 -9.81 Calculations. 2 Summing up 1. Discuss the reasons for differences between the measures maximum range and the calculated maximum range. Include your percent error in your discussion as well as the effects on the measurements. Actual - Calculated x100 Percent error = Actual 2. Under what conditions would shooting a balloon straight up allow very accurate measurements of initial velocity (in other words how could we change the experiment to get a very accurate measurements of initial velocity)? How would these changes affect your data? 3. Compare qualitatively (descriptive like it is cool today) and quantitatively (with numbers 42 degrees) the motion of the balloon in part B and explain the acceleration of the balloon as it travels up with the acceleration as it travels down. You need to discus velocity and acceleration both horizontally and vertically. This question has a high point value so spend some time on it! 3