seek Physics 11 - Conservation of Energy Lab LILLLLLLLLL Name:_ Purpose: A. To determine the change in mechanical energy on a bouncing ball due to energy being transformed into other forms as work is done on the ball (one bounce). Hypothesis: If you drop a ball against a horizontal surface , then the ball will rebound to a lower neight , because the change in mechanical energy will transform into other forms of work acting on the ball . Procedure: 1. Use a meter stick to measure 1.0 m in height. This is where you will drop the ball from. 2. Determine the initial gravitational potential energy of the ball at this height. Record this value in the data table. Assume the mass of the ball is 500 grams. 3. Based on the potential energy of the ball, what would the maximum velocity of the ball be just before it hits the ground when you drop it? (Ignore air resistance) Calculate and record in the data table. 4. Drop the ball from 1.0 m and measure the height that it rebounds to after one bounce. *It is important that you DROP the ball and do not throw it downward* Repeat this process three times and find the average rebound height. Record values in the data table. 5. Determine the final gravitational potential energy of the ball at its rebound height. Data and Observations: (Show all calculations) Initial Gravitational Potential Energy at 1.0m Maximum Velocity of Ball before it hits the Ep = mogh ground: (using Conservation of Energy) ME : ME ' Ep + ER + 5% = ER + EX+ 56 = 4.9J Ep = Ex ' gighi= $ mint Vagni = VF 4.43 m/s Rebound Height 1 Rebound Height 2 Rebound Height 3 Average Rebound Height 0.571 m 0. 517 m 0-532m 0. 537 m Final Gravitational Potential Energy of Ball Ep = mghaug) = 2.63 JData Analysis: A. Determine the amount of energy that has been transformed into forms other than mechanical energy. B. Determine the percent difference between the initial and final gravitational potential energy. Final _ Potential_Energy x100% Initial_ Potential_ Energy Conclusion: Using complete sentences and multiple paragraphs conclude your lab. Use the prompting questions below to guide you. 1) Answer to your hypothesis. 2) How confident are you in your answer? Why are you confident? (use sources of error to justify your confidence) 3) What went well? (i.e. things that increase the confidence in your answer are). 4) What are the factors that caused the initial gravitational PE at 1.0 m and the final gravitational PE to be different? 5) What would you improve next time (or) investigate next time (or) changes you make (or) advice you would give