balloon with stitches of a baseball
balloon with baseball stitches drawn on it

 

 

Code Number: 2C20.63

Demo Title: Magnus Effect - Weather Balloon Curve Ball

Condition: Good

Principle: Magnus Effect on a Baseball.

Area of Study: Fluids, Chem and Physics of the Env.

Equipment:

Large Latex Weather Balloon (Edmund Scientific), Large Cloth Covered Balloon, Helium

Procedure:

See also 2C20.63 in Fluids for movies of this demonstration.

Take the weather balloon and draw the stitches of a baseball on it. Fill the balloon with part air and part helium to the desired diameter, so that the balloon has neutral buoyancy. Tape the end of the balloon so that it is flat against the surface of the sphere. Throw the balloon into the classroom crowd with some spin and watch the balloon curve. 

References:

  • Rod Cross, "Aerodynamics of a Party Balloon", TPT, Vol. 45, # 6, Sept. 2007, p. 334.

    2C20.63 - Magnus Effect - Weather Balloon Curve Ball