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Michelle Lord Mr. Celona Honors Physics 10/07/2009 Bull’s Eye Lab Objectives: 1. To understand and examine the freedom of vertical and horizontal components, and to be able to calculate the landing point of a projectile. Materials: 2. Wooden ramp, large steel ball, target paper and carbon paper, meter stick, and a stopwatch. Background: ▪ Gravity is a universal force that affects large and small objects in all forms of matter and energy. Gravity keeps the Moon in orbit around the Earth, and it keeps all of the other planets within the solar system in orbit around the sun. If an object held near the surface of Earth is released, it will fall and accelerate, or pick up speed, as it descends. This acceleration is caused by gravity, the force of attraction between the object and Earth. The force of gravity on an object is also called the object’s weight. This force depends on the object’s mass, or the amount of matter in the object. Data: Xf = ' Yf = -.82m Vo = 1.47m/s Vo = 0 A= 0 A = -9.8m/s/s T = ' Xf = Xo + VoT + 1/2AT^2 Yf = Yo + VoT + 1/2AT^2 -.82 = -4.9T^2 -4.9 -4.9 T^2 = .17 T= .41 sec Xf = 1.47(.41) Xf = .6m Marble speed on table: .39 = 1.7m/s .23 Xf = 1.7(.41) Xf = .7m Procedure: 1. Set up your ramp, by first clamping a pole clamper to the rind stand, and then leaning the board at an angle on the pole clamp. Make sure there is enough room so that there is at least 25 centimeters of table space between the end of the ramp and the end of the table. 2. Choose a spot on the ramp, where the ball is going to be released, mark that spot. Record the height of this point from the table. 3. Release the ball, record the time from when the ball hits the table and reaches the end of the table, do this 10 times, and then time the average time. (NOTE: Do not let the ball hit the ground.) 4. Find the horizontal speed of the ball once it hits the table using the proper equation, and record its value. 5. Measure and record the vertical height of the table from the floor. 6. Find the time it will take the ball to fall from the table to ground and record its value. 7. Predict and record how far the ball will land from the table if it is allowed to roll off of the table and hit the ground. 8. Have your teacher place the target down in the spot where you predict, and then test to see if your prediction was accurate. Analysis: 1. The percent error is %13.25 2. A miscalculation might cause the ball to miss the target. Human error, such as hitting the stop watch, might also cause the ball to miss the target. The placement of the ball might also effect the balls accuracy. [pic]