Scenario+4+pd+7

Donna's Pendulum Experiment Donna has observed that her father can **__control the speed of their grandfather clock by adjusting the height of the weight on the end of the pendulum.__** Donna thinks that the pendulum __**will move faster when the weight is lowered**__, and wants to test her idea. //Donna gets a stopwatch and __**measures the time it takes for the pendulum to swing twenty times when the weight is moved to its lowest position**__//. Donna begins to __**move the weight up by 1 cm**__ and continues to __**measure the time for twenty swings**__ of the pendulum. Donna records her data:
 * Measurements made from the bottom up. So 1 cm is lowest position and 5 cm is highest position. **
 * Position ||= Time (seconds) ||
 * = 1 cm ||= 23.23 ||
 * = 2 cm ||= 21.56 ||
 * = 3 cm ||= 20.33 ||
 * = 4 cm ||= 19.00 ||
 * = 5 cm ||= 18.02 ||

Complete each of the following:
 * 1) Identify Donna's hypothesis: Donna's hypothesis is that the pendulum will move faster when the height of the weight is lowered.
 * 2) Identify the independent variable: The independent variable is the height of the weight of the pendulum.
 * 3) Identify the dependent variable: The dependent variable is the twenty swings of the pendulum for each position.
 * 4) Identify the other variables Donna needs to consider/control during this experiment: type of clock(brand), quality of clock, quality of pendulum, environmental conditons, material used to make clock, material used to make pendulum
 * 5) Identify the control group in this experiment: The control group is the twenty times when the weight is at its lowest point.
 * 6) Identify the experimental group(s): The groups with the other positions.
 * 7) What conclusion might Donna draw from this data? The conclusion Donna might draw is that when the height of the weight is lowered it does move faster.
 * 8) What recommendations might you suggest for further study or for improvement? One recommendation is that the time of the pendulum swings with no weight on it should be included.