Ballistics Demonstrator

The science of ballistics involves the motion of projectiles. Exterior ballistics concerns the projectile after it leaves the device that it is shot from. The term "ballistics" comes from the name of one kind of catapult, the ballista.

Achievement

  1. Identify the Problem
  2. Generate Concepts
  3. Develop a Solution
  4. Construct and Test a Prototype
  5. Evaluate the Solution
  6. Present the Soltution

Constraints

Standards

Engineer's Notebook—10 points

Evaluated using the usual rubric. Make sure you:

The Device—10 points

The device will be judged based on the quality of construction and the design elements that let it shoot a marshmallow a consistent and repeatable distance.

Performance During Calibration—20 points.

5 points each for:

Performance at the Target—20 points.

Your score is 20 points minus your total distance away from the target in feet.

Completition of the Problems—24 points

4 points per problem. Make sure and:

The Problems

  1. A skydiver jumps from 10,000 ft. How fast is she going after:
    a. 1 second?
    b. 2 seconds?
    c. 10 seconds?
    d. What is her altitude after 10 seconds?
     
  2. A baseball is thrown straight up at 64.4 ft/sec.
    a. How long does it take to get to its highest point?
    b. How high does it go?
    c. How long does it take to get back to your glove?
    d. How fast is it going when you catch it?
     
  3. A projectile is thrown at 100 ft/sec at an elevation angle of 45°.
    a. What is the speed in the horizontal (X) direction?
    b. What is the speed in the vertical (Y) direction?
    c. What is the time of flight?
    d. What is the maximum altitude?
    e. How far does it go?
     
  4. A projectile is thrown at 100 ft/sec at an elevation angle of 30°.
    a. What is the speed in the horizontal (X) direction?
    b. What is the speed in the vertical (Y) direction?
    c. What is the time of flight?
    d. What is the maximum altitude?
    e. How far does it go?
     
  5. A projectile is thrown at 100 ft/sec at an elevation angle of 60°.
    a. What is the speed in the horizontal (X) direction?
    b. What is the speed in the vertical (Y) direction?
    c. What is the time of flight?
    d. What is the maximum altitude?
    e. How far does it go?
    Bonus: Which of the last three went farthest? Why don't hit baseballs fly the farthest at this angle?
     
  6. A projectile thrown at 30° goes 150 yards in 4 seconds
    a. What is the velocity in the horizontal (X) direction in ft/sec?
    b. What is the Initial Velocity?
    c. How high did the projectile go?
    d. How far would it go if thrown at 45° at the same initial velocity?
    e. How far would it go it thrown at 60° at the same initial velocity?
     

Links

Fat Brain Catapult Kit
Steve Spangler Science
The Grommet
Leonardo Da Vinci
Don't try this
And really don't try this
Or even this
And definitely not this



Online Physics Games

 

Last updated on 29 April 2016 by P. A. Wiedorn

 

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