Xtreme STEM
DashX

Ready, Aim, Fire Throw & Blow!

Introduction

You are going to experiement with how the length of an impulse (the distance over which we apply a force) affects the distance it will travel

Independent Variables
  1. Length of Impulse
Dependent Variable
  1. Distance Traveled (displacement)
Control Variables
  1. Object's mass

 

All distances should be recorded in meters

1) Throwing

  1. Make a table like below (on paper or in Excel)
  2. Throw a ball as far as you can
  3. Measure the distance your hand was able to move while holding the ball (Impulse Distance)
  4. Record the distance the ball went
  5. Repeat but this time stand with your back against a wall/tree (this will reduce your impulse)
  6. Repeat, still against the wall, but now with your partner's arm 25cm away from the wall
  7. Repeat, still against the wall, but now with your partner's arm 50cm away from the wall
  8. Question: What happens to the distance of the ball each time? Why?

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Example Table
Limit Impulse (Hand) Distance cm Ball Distance m
None    
Wall    
Wall + 25cm    
Wall + 50cm    

2a) Make a Blow-Dart Gun

blow-gun
  1. Roll one sheet of paper tightly around a 20mm pipe into a tube (place the paper length-wise)
  2. Keep rolling until it is all rolled up
  3. Tape the roll in 3 spots (both ends and middle)

Roll

 

2b) Make a Dart

(or use the ones already made)

  1. Start with one of the semicircles cut out of paper
  2. Roll the paper into a cone shape
  3. The edges should meet after wrapping around once
  4. Tape the cone
  5. Screw a screw into the tip
  6. Cut 4 notches to make "feathers" at the back of the dart about 2-3mm long

2c) Blow-Dart Impulse DISTANCE Measurements

 

  1. balloonsGlassesEye protection must be worn now
  2. Make a table like below (on paper or in Excel)
  3. Measure and record the length of your blow-gun tube
  4. Go outside
  5. Ensure no one is in front of you
  6. Now shoot a dart as far as you can
  7. Measure and record the dart distance

Your Table:
Tube Length cm Dart Distance m Cup Displacement cm
     
     
     

 

2c) Blow-Dart Practise

 

  1. balloonsGlassesEye protection must be worn now
  2. Go outside
  3. Blow-up a balloon (1 balloon per student)
  4. Place a clip on the end of the balloon
  5. Place the clip in a cup half full of water
  6. Stand back 5 meters
  7. Ensure no one is walking in front of you
  8. Practise your blow-gun skills by trying to pop one balloon
  9. Move 1m closer everytime if you miss

dirt

 

2e) Blow-Dart Impulse FORCE Measurements

 

  1. balloonsGlassesEye protection must be worn now
  2. Measure and record the length of your blow-gun tube
  3. Make a stack of 3 cups
  4. Stand back 1m
  5. Ensure no one is in front of you
  6. Now shoot a dart as hard as you can
  7. Keep trying until you hit the cup
  8. Measure and record the distance the cup moved

2f) Make your Blow-gun LONGER

blow-gun

  1. Place your tube back onto the pipe
  2. Roll another piece of paper into a tube - overlap them by about 3cm
  3. Tape like before (in 3 spots)
  4. Repeat the distance and cup force tests
  5. If you have time you can repeat one more time adding a third tube of paper
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