 # Lab 2

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Lab Report
Experiment # 2
Data Collection David Case:
January 23, 2015

Experiment #2 Data Collection

Objectives:
Exercise 1: Formulating a Hypothesis about pitching speed.

To form a hypothesis for the pitching velocity of a ball. Use a spreadsheet and math to calculate the actual velocity and determine the accuracy of the hypothesis. I will also roll a large ball to measure its velocity and graph its horizontal motion. Materials:
Volley Ball Computer
Softball Large Open Space
Mitt Stop Watch
Chair Tape Measure
Tape Volleyball

1. Formulating a Hypothesis about baseball pitching speed.
I believe I will be able to pitch the ball at a rate of 25 meter per second, based on my experience throwing the ball. I would call my hypothesis an educated guess. 2. I began my experiment with 2 friends our in the yard. We decided to use a distance of 10 meters between 2 of use with the third person timing the throw. 3. We each took turns throwing the ball 3 times, I have entered the date in the table below.

A) How did your throwing times compare to your hypotheses? B) How do the average times and speeds calculated by the spreadsheet compare to the ones manually calculated?

A. My hypothesis was more than my actual throwing speed. I over estimated.
B. The averages for both the spreadsheet and manual calculations turned out to be the same.

Exercise 2: Hypothesizing about and Measuring the Motion of a Ball on a Horizontal Surface

Hypothesis: The ball’s velocity will decrease as it travels down the flat surface.

1. Using masking tape I marked off 6 m in 1 m increments alone the sideway outside my house. My partners and I each took turns rolling the ball, keeping track the times, and recording the data.
Here are the graphs showing the data:

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