# Lab 5 - Experiment 5-1(Pendulum Objective To demonstrate...

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Objective : To demonstrate the conservation of energy. Results, Explanations, Conclusions : For this experiment we tied a string to the middle of a yardstick and placed it between two chairs so the string hangs in the middle. We then added a weight to the end of the string to make a swinging pendulum. We had a person hold the end of the pendulum and move back 3 to 4 steps. We then had another partner hold the yardstick in place. Then we placed the ruler on the ground in front of our feet. We then had a person start timing when we released (not push) the pendulum and had them stop at the end of 10 seconds. We counted the number of swings back and forth in those 10 seconds and determined the time per swing. Then we added a different weight to the pendulum and repeated the above procedure, making sure that we released the pendulum at the same place each time. We noted how high the pendulum swings at the end of each arc. It was not the same for the first experiment as it was for the second. The first time it swung higher than the second time. The weight does affect the speed of the pendulum because it becomes slower with the greater weight. When we added weight to the pendulum it didn’t move as fast as the first time we did the experiment because energy is equal to weight multiplied by height. There was more weight so the energy and speed would be less. The weight; however, does not affect the period or number of swings of the pendulum. This is because the second object is heavier, which makes is slower but doesn’t go as high. The first object is lighter and has less weight but it moves higher. Since the first moves higher because it has less weight and the second slower but doesn’t go as high, it cancels each other out and the period of swings is not affected. As far as one can tell, the law of conservation of energy does hold true. This is because the amount of energy is the same but the form of energy is what changes. Teaching Applications : -“Swinging”: For this experiment take the children out to the playground and have one of them swing on one swing while an adult swings on another right beside them. Have the children observe what happens when they both start pumping. Since the adult should be heavier they won’t go as high and the children, but the number of swings should be the same. This is because they weigh less but go higher than the adult who weighs more but doesn’t go as high. This experiment is a good example of the conservation of energy. -“Newton’s Cradle”: In this experiment have the children observe what happens when you move Newton’s Cradle. They should notice that when you take two balls from one end and release them there will be two balls at the other end that move outwards. Discuss with them that this experiment is demonstrating the conservation of energy and that these occurrences happen many times throughout our daily lives. Diagram

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Lab 5 - Experiment 5-1(Pendulum Objective To demonstrate...

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