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🔬 Science - Class 9
Unit 7 · Force and Motion

Elasticity and Plasticity

ScienceSubject
8 minEstimated read
क्रियाकलाप 7.15

Watching Newton's Third Law with a Balloon Rocket

ObjectiveTo demonstrate Newton's third law of motion
Materials
  • A balloon
  • A straw
  • Thread
  • Cellotape
  • Scissors
Method
  • Tape a piece of straw to the surface of the balloon and thread a long string through the straw.
  • Tie the two ends of the string tightly to two supports so that the string stays stretched.
  • Inflate the balloon and pinch its mouth shut with your fingers.
  • Suddenly release the mouth of the balloon and observe how the balloon moves.
Discussion
  • Describe the motion of the balloon on the basis of Newton's third law of motion.
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