# Physical Science Activity

### How Fast Can You Pitch?

1. Imagine yourself pitching a tennis ball to a partner a distance of about 12 meters at a speed so that your partner can catch the ball which you throw to him/her.  Predict how fast you throw the ball (use meter/sec or m/s for the speed units).
2. Do it!
• Obtain the following items:
• ruler (meter stick)
• tennis ball
• digital stop watch
1.  Go outside and measure the suggested distance.  With  at least 3 people to a group, measure the speed that each person can comfortably throw the ball such that the 2nd person can catch it.  The third person in the group works the timer.  Record at least 3 trials for each person and record the results in your notebook similar to the table below:  Note: record only the throws which are caught by the catcher in the group!  The cells are blocked out so you will get into the habit of recording data in your own notes.
 Person (thrower) Time (trial 1) Time (trial 2) Time (trial 3) Average

1. Decide how to calculate the average speed for each thrower.  Hint: use the units of speed (meter/sec) to decide how to calculate the speed.  Do it!
2. Compare your average speed with your prediction.
3. Calculate your speed in miles/hour.  See your text and the instructor.
4. After you calculate the speeds for your data, enter everyone’s data from the whole class in a spreadsheet and make the calculations in the spreadsheet.  It will help if you place a data table on a marker board in the classroom.
Hard Throw!  Now comes the fun part!  Instead of having someone catch your tossed ball, you get to throw it as hard as you can (don’t throw your arm out!) outdoors against the brick wall.
1. Predict your hard throwing speed.
2. Measure your throwing speed using the same techniques as above.  You should use 6 meters as your distance.
3. Enter everyone’s data in another spreadsheet and make the calculations from m/s into mi/hr.