Physics 11

Name: _________________________________

Stomp Rocket Laboratory Problem: The goal of this experiment is to calculate the initial velocity and peak height of a rocket launched vertically, using the kinematics equations learned in class.

Procedure: 1. Go outside and set up the rocket launcher and rocket. Try to have the rocket aiming perfectly straight up. 2. Do a couple of practice launches. 3. When you are ready, you should time the entire flight of the rocket for each person in your group, up to three people. 4.

As one student launches the rocket, another student will time the flight with the stopwatch. Remember you need the time from when the rocket is launched to when the rocket returns to the ground.

5. Write down each person’s name and their total flight time in the data table on the next page.

Calculations: Using the kinematics equations for constant acceleration, FIRST perform the following calculations for YOUR launch. Then repeat the calculations for the other two launches. Lastly, add your results to the data table. Equations: g = -9.81 m/s2 v2 = v1+ at d = v1t + ½ at2 v22 = v12 + 2ad 1. The apex is the peak of the rocket’s flight. Calculate the time it takes the rocket to reach its apex, which is equal to ½ the total flight time. Enter this information in the data table. 2. Make a mini-sketch of the path of the rocket launch and landing.  Label the ground level “d1” and the highest point “d2.”  Next to the d’s, write the corresponding symbols for initial and final velocity.  What section(s) of your sketch do you think would be represented by t and ½ t? Label t and ½ t.

1

Physics 11

Name: _________________________________

3. What is the velocity of the rocket at the instant it reaches its apex? _________________

4. What is the acceleration of the rocket during its flight? ___________________________ 5. For your launch, fill in any values you have for the following variables. Indicate unknowns with a (?).

v1 v2 d1 d2 a t highest point 6. Taking into account the variables for which you have data, select an equation that could be used to determine the initial launch velocity of the rocket. Write the equation below.

7. Use the equation you chose in #6 to calculate the initial velocity of your launch only.  Be sure to recopy the equation and rewrite all the variables you have data for, solve for the initial velocity showing all work. Fill in the initial velocity for your launch in the data table.

2

Physics 11

Name: _________________________________

8. Now, again taking into account the variables which you now do have data for, what equations could be used to determine the maximum height achieved by the rocket?

9. Use either of the equation you chose in #8 to calculate the maximum height of your rocket. Show ALL work and steps as you did in #7. Enter this information in the data table.

10. Now repeat the above steps for the other two launches in each case, solving for initial velocity (v1) and maximum height (d).  Be sure to use each of the two possible equations for maximum height in order to gain familiarity with each of them. Enter this information in the data table.

3

Physics 11

Name: _________________________________

Data: Name

Total Time (seconds)

Time to Apex (seconds)

Initial Velocity (m/s)

Maximum Height (m)

Conclusions: 1. What was the rocket’s velocity at the apex of its flight?

2. What is the rocket’s speed just before it hits the ground equivalent to?

3. Rank your three launches in terms of lowest to highest initial velocity and lowest to highest maximum height.

(Lowest v1) _________________

__________________

_________________ (Highest v1)

(Lowest apex) _______________

_________________

_______________ (Highest apex)

4. What is the relationship between the initial velocity and the apex of the rocket?

5. Explain how you could use this method to calculate the height of fireworks?

4

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