WayCoolScience7 - Scenario 2

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:

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:

Identify Donna's hypothesis:Does the pendulum move faster when it's in the lowest postion or the highest position.
Identify the independent variable:The position or height.
Identify the dependent variable:The times.
Identify the other variables Donna needs to consider/control during this experiment:The same clock, also you would might need to move the weight up by 1cm., need the stop watch. Set the clcok at the highest position.
Identify the control group in this experiment:The highest position.
Identify the experimental group(s):The heights and the weight with the time.
What conclusions might Donna draw from this data?The data shows that the lower the weight the faster the speed goes.
What recommendations might you suggest for further study or for improvement?Use different clocks, use a different weight and move a diffferent cm.Yes the hypotesis is wright.