Name_____________________



Name_____________________

Regents Physics

Period ______

Throwing Up (Not Puke)

Research Problem: To calculate the initial speed and height of a thrown ball.

Materials: ruler, tennis ball, stopwatch (Ipod & Cellphones), sweatshirt

Part I

SAFETY CAUTION: Separate from other groups and keep your eyes open for falling tennis balls.

Procedure:

1. All lab group members will throw a tennis ball as high as they can straight up into the air (without hitting the ceiling).

2. Have one partner start timing once the ball has left the thrower’s hand and stop timing once it is caught. Try to catch the ball at the same height that you threw it.

3. Repeat this four more times or for all lab group members. Record the times in the data table below.

4. Using the equations of motion, calculate the initial speed of the ball for each trial and the height each ball reached. Put all of your results neatly in the table. Show a single calculation on the next page. Please calculate your OWN initial velocity and maximum height.

5. Calculate the average speed of the ball. Show your calculations on the next page.

Data Collection

1. Fill in the data table below

|Trial |Total Time (sec) |Time to Top (Sec) |Initial Speed (m/s) |Height of the ball (m) |

|1 | | | | |

|2 | | | | |

|3 | | | | |

|4 | | | | |

|5 | | | | |

Data Processing

Calculate the throwing speed (initial velocity), maximum height, and average velocity for all trials using your kinematic equations. Show only a single sample calculation. That means one calculation for YOUR OWN initial velocity, one calculation for the maximum height, and one calculation for the average velocity. The rest of the trials can be done using only the calculator. The work DOES NOT have to be shown. Report the rest of your results in the table on the previous page.

SHOW ALL WORK BELOW & THEN WRITE ANSWERS IN CHART ABOVE.

Givens and Unknowns: Equations Substitution with Units: Solution:

(List them below) Used:

vf top =

ttop =

a =

vi = ?

d = ?

vavg =

Conclusion:

1. State one source of error in the experiment that likely occurred during your group’s data collection. Then explain how the error occurred. Also, explain how that error affected your overall results, such as increasing or decreasing your measurements/results/etc.

2. Please describe the motion of the tennis ball from the instant it leaves the students hand until it is caught (i.e. is it accelerated motion, when is the object changing speeds, when is the velocity zero, what is the acceleration at all points, etc.)

3. Ima Rilla Saari is cruising at 28.0 m/s down Lake Avenue and through the forest preserve. She notices a deer jump into the road at a location 62.0 m in front of her. Ima first reacts to the event in .427s, then slams on her brakes and decelerates at -8.10 m/s2. Does Ima strike and kill the deer? (i.e. First determine the distance Ima travels while she is processing the fact that there is a deer in the road and she needs to start braking, and then add to that the distance that it actually requires her to stop once she applied pressure to the brake pedal.)

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