Sticky Tape Activity - Dan MacIsaac



E&M1-Sticky Tape Activity

Part I – Top tapes

1. Take a 15 cm to 20 cm piece of transparent tape and make a handle on the end by folding under the first cm of tape, sticky side to sticky side. Place this tape on the lab table. This is the base tape.

2. Attach a second similarly prepared strip of tape onto the base tape. Label this tape “T” for top.

3. Repeat steps 1 and 2 so that you have two sets of base and top tapes.

4. Quickly peel the first of the T tapes from the base, and hang the T tape from the edge of the table.

5. Quickly peel the second of the T tapes from the base and slowly bring the second T tape near the hanging T tape. Describe what you see. Include a series of sketches of the tapes as they approach one another with vectors to represent the forces on the tapes. Label the forces.

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Part 2 – Top and Bottom tapes

6. Repeat steps 1 through 3 above, but do not label the tapes yet. Place another

15 cm tape with handle on top of each of the tape sets. You now have two sets of 3-layer tapes.

7. Label uppermost tape “T” for top, and the middle tape “B” for bottom.

8. Cut 2 pieces of paper, the same dimensions as the tapes, and hang one from the edge of the table. Label the hanging paper “P." Approach the hanging paper with the other piece of paper. Describe what you see.

9. Cut 2 pieces of aluminum foil, the same dimensions as the tapes, and hang one from the edge of the table. Label the hanging foil “F." Approach the hanging foil with the other piece of foil. Describe what you see.

10. Gently peel one set of T and B tapes from its base tape, keeping the T and B tapes together. Rub the tape on a faucet or your lip until there is no attraction to your hand. Quickly peel them apart.

11. Hang each strip next to the hanging paper and foil. (Place them at least 15 cm apart.)

12. Repeat step 10 with the other set of tapes.

13. With a T tape hanging from one hand and a B tape hanging from the other, experiment by approaching each of the four strips hanging on your table (top tape, bottom tape, foil and paper). Describe what you see. Include a series of sketches of the tapes as they approach one another with vectors to represent the forces on the tapes. Label the forces.

Our Model of the Atom and the assignment of (+) and (-) charges

Our current model of the atom is consistent with the existence of 2 types of charge. An atom has a positively charged nucleus surrounded by mobile negatively charged electrons. Materials become charged by the gain or loss of these mobile electrons. Based on observations you will see later we assign the label of negative to the PVC rod when rubbed with fur and positive to the Lucite rod when rubbed with plastic.

14. Rub the PVC rod with fur and approach each of the four hanging objects. Describe what you see. Note the strength of the interactions

15. Rub the Lucite rod with plastic and approach each of the four hanging objects. Describe what you see. Note the strength of the interactions

16. Based on your observations from using the two rods, label the T and B tapes with either a + or -. Restate the interaction between T and B tapes, T and T tapes, and B and B tapes using the terms positive and negative instead of top and bottom.

Names:

Summary Page:

|#5: Sketch with labeled force vectors for two top tapes |Sketch with labeled force vectors for two top tapes half as far apart as left|

|close enough to affect each other. |sketch |

|#8: Describe paper on paper interaction |#9: Describe foil on foil interaction |

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|#13: Describe top tape and foil interaction |Describe top tape and paper interaction |

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|Diagram with forces |Diagram with forces |

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|#13: Describe top tape and top tape interaction |Describe top tape and bottom tape interaction |

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|Diagram with forces |Diagram with forces |

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|#13: Describe bottom tape and foil interaction |Describe bottom tape and paper interaction |

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|Diagram with forces |Diagram with forces |

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|#13: Describe bottom tape and top tape interaction |Describe bottom tape and bottom tape interaction |

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|Diagram with forces |Diagram with forces |

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|#14: Describe PVC rod and paper interaction |Describe PVC rod and foil interaction |

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|#14: Describe PVC rod and top tape interaction |Describe PVC rod and bottom tape interaction |

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|#15: Describe Lucite rod and paper interaction |Describe Lucite rod and foil interaction |

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|#15: Describe Lucite rod and top tape interaction |Describe Lucite rod and bottom tape interaction |

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|#16: State top and top tape interaction based on charge |State top and bottom tape interaction based on charge |

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|#16: State bottom and bottom tape interaction based on charge | |

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Thought pages:

1. Imagine you could see the differences between the top and bottom tapes at the atomic level. On the partially separated T and B tapes invent a way of representing how the tapes change as they are separated.

2. Invent a way for the paper to be attracted to both a top and a bottom tape while keeping these facts in mind. The paper is neutral and electrons can’t move away from the nucleus

3. Invent a way for the foil to be attracted to both a top and a bottom tape while keeping these facts in mind. The foil is neutral and each atom has a free electron that can move around

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table

B

T

P

F

Not to scale

Hint: Here is a normal atom with a positive nucleus and an electron cloud evenly spread around it.

Piece of paper with five huge atoms

T tape

+

Piece of paper with five huge atoms

B tape

T tape

Piece of foil

Piece of foil

B tape

table

base

bottom

table

top

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