QUESTION IMAGE
Question
after the straw has been rubbed there is an interaction between the straw and paper which is capable of lifting the scraps of paper. what can you say about the size of this interaction compared to that of the earths gravitational interaction with the scraps of paper?
use: the size of this interaction is ______ compared to that of earths gravitational interaction with the paper.
the force involved in this interaction is called an electrical force, and was first observed by the greeks, who found that pieces of amber attracted other things after being rubbed with fur. if a material attracts the bits of paper, then it is said to be electrically charged. can you conclude at this time that the unrubbed bits of paper are charged according to the definition above? why or why not?
use: i can conclude that the unrubbed bits of paper ____ charged because i observed ____.
part 2: charged states of matter
- take a 15 cm piece of the scotch tape and make tabs by folding the first few centimeters of tape on each end sticky side together. stick the tape to the tabletop and press and rub it down well with your finger. now peel the tape carefully but briskly from the table top. will either or both sides of the tape attract the scraps of paper? ______
- does the peeled portion of the tape meet the definition of being charged from part 1? ______
- roll a piece of paper to form a tube and bring it near the tape. is there an interaction between the paper tube and the tape? ______
- does the paper tube meet the definition of being charged from part 1? why or why not?
use: i can conclude that the paper tube __ charged because i observed ____.
- make a second tape strip like the first one. press them both down on the table separately, and then peel them loose from the table. try bringing the tapes near each other and see what effect they have on each other. does it matter which sides of the tape face each other? ______
First Question (About Interaction Size)
Step1: Analizar las fuerzas
La interacción entre el paja frotada y el papel es una fuerza eléctrica, mientras que la interacción gravitacional de la Tierra con el papel es debida a la gravedad. Las fuerzas eléctricas pueden ser mucho más intensas que la gravedad a escalas microscópicas (como con pequeños trozos de papel), pero en este caso, la fuerza eléctrica aquí (que levanta el papel) debe ser mayor que la gravitacional en magnitud para que pueda vencerla y levantar el papel. Entonces, la interacción (fuerza eléctrica) es mayor que la gravitacional en este caso.
Step2: Rellenar el espacio
Dado que la fuerza eléctrica es suficiente para levantar el papel contra la gravedad, la magnitud de la interacción (fuerza eléctrica) es mayor que la interacción gravitacional de la Tierra con el papel.
Para ser cargado según la definición, un material debe atraer bits de papel. Los bits de papel sin frotar no atraen otros objetos (solo son atraídos por el paja cargado), así que no cumplen la definición de "cargado" (que requiere atraer bits de papel).
Step1: Comprender la electrización por fricción
Al despegar la cinta de la mesa después de frotarla, la cinta se carga eléctricamente por fricción. Cargas eléctricas pueden atraer objetos neutros (como trozos de papel) debido a la inducción electrostática o a la atracción entre carga y neutro.
Step2: Predecir la interacción
La cinta despegada (cargada) atraerá los trozos de papel, ya que las fuerzas eléctricas actúan sobre objetos neutros cercanos. Entonces, al menos una de las caras (o ambas) atraerá el papel.
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The size of this interaction is greater compared to that of Earth's gravitational interaction with the paper.