Sad-Happy Ball Combo on Bifilar Support
Sad-Happy Ball Combo on Bifilar Support

 

Code Number: 1N30.50

Demo Title: Impulse Demo - Elastic and Inelastic Pendulum

Condition: Good

Principle: Conservation of Linear Momentum, Impulse

Area of Study: Mechanics

Equipment: 

Sad-Happy Ball Combo on Bifilar Support, 2 x 4 Board, and Meter Stick on Stand.

Procedure:

Set the sad-happy ball combo on the suspension and move the suspension apart until the ball swings without any lateral movement.  Set the upright meter stick to a position so that when you pull back on the pendulum you come to about 62 cm.  To change from an elastic to an inelastic collision just reverse the bifilar supports.  The inelastic collision will not knock over the board where as the elastic collision will.

References:

  • Rod Cross, "Elastic and Inelastic Collisions of a Ball with a Wood Block", TPT, Vol. 55, #8, Nov. 2017, p. 467.
  • Paul Hewitt, "Answer to January 2017 Figuring Physics", TPT, Vol. 55, #2, Feb. 2017, p. 120.
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  • David Kagan and Alan Kott, "The Greater-Than-g Acceleration of a Bungee Jumper", TPT, Vol. 34, #6, Sept. 1996, p. 368.
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  • Fred Bucheit, "A Momentum Transfer Demonstration with 'Happy/Unhappy' Balls",TPT, Vol. 32, #1, Jan. 1994, p. 28.
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  • "M-600. Rebounding Pendula Balls", DICK and RAE  Physics Demo Notebook
  • "M-250. Break String with Large Mass", DICK and RAE physics Demo Notebook.
  • Bill Franklin, "Toppling a Block With a Pendulum Blow", Teaching About Impulse and Momentum, p. 4.16.
  • Martin Gardner, "Stabbing an Eggshell", Science Tricks, p. 36.
  • David Kutliroff, "25. Conservation of Momentum in Elastic and Inelastic Collisions", 101 Classroom Demonstrations and Experiments For Physics Teachers, p. 57.
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  • Robert Ehrlich, "C.5. Swinging Two Balls Into a Block", Turning the World Inside Out and 174 Other Simple Physics Demonstrations, p. 27 - 28.
  • Julius Sumner Miller, Q32 & A32, Millergrams I – Some Enchanting Questions for Enquiring Minds, p. 30 & 87.
1N30.50 - Impulse Demo
1N30.50 - Dr. James Wetzel, PHYS 1611 - Impulse Demo
1N30.50 - University of Maryland QOTW Answer #77 Part 1
1N30.50 - University of Maryland QOTW Answer #77 Part 2