static electricity
Jean Yuss is investigating the charge on several objects and makes the following findings Object D = repels F
+
Jean Yuss is investigating the charge on several objects and makes the following findings Object F = attracts A
+
the object that loses the electrons acquires a __ charge
+
You rub a rubber rod with a silk cloth and a second rubber rod with a wool sweater. The silk cloth will acquire a ___ charge; the wool sweater will acquire will acquire a ___ charge. The sweater and the cloth will then be observed to ___ (attract, repel, not interact with each other)
+ , + , repel
Anna Litical One negatively charged balloon near some neutral paper bits at rest on a table a. Object A is observed to attract the paper bits; object A must be __
+ or -
Anna Litical One negatively charged balloon near some neutral paper bits at rest on a table b. Object B is observed to attract the balloon, object B must be __
+ or neutral
B) # of excess or deficient electrons: 1.0E6 deficient electrons
+1.6E-13 C
D) # of excess or deficient electrons: 2.5E8 deficient electrons
+4.0E-11 C
Jean Yuss is investigating the charge on several objects and makes the following findings Object C = attracts B
-
Jean Yuss is investigating the charge on several objects and makes the following findings Object C = repels C
-
The object that gains electrons acquires a __ charge
-
Anna Litical One negatively charged balloon near some neutral paper bits at rest on a table c. Object C is observed to repel the balloon, object C must be__
- (neg)
Anna Litical One negatively charged balloon near some neutral paper bits at rest on a table e. Object E is observed to attract the paper bits and repel the balloon, object E must be __
- (neg)
You rub a glass rod with a silk cloth and a second glass rod with rabbit fur. The silk cloth will acquire a ___ charge; the rabbit fur will acquire will acquire a ___ charge. The fur and the cloth will then be observed to ___ (attract, repel, not interact with each other)
- , + , attract
E) # of excess or deficient electrons: 6.82E12 excess electrons
-1.09E-6 C
A) # of excess or deficient electrons: 1.0E3 excess electrons
-1.6E-16 C
C) # of excess or deficient electrons: 2.0E9 excess electrons
-3.2E-10 C
A rubbed w/ B C rubbed w/ D A and D repel...... A acquired a __ charge B acquired a __ charge C acquired a __ charge D acquired a __ charge
A = + B = - C = - D = + if they repel that means they have a like charge
When the balloon is held near to the pop can (and before being touched by the hand), the distribution of charge is pulled away, the pop can is charged.
A. + - +
Materials through which electrons can move readily are classified as
A. Conductors
polarization is most often noticed of .....
A. Conductors
When the negatively charged sphere is touched, __ move from the __ to the ___
A. ELECTRONS, move for the SPHERE to the HAND
This process ( ELECTRONS moving from the HAND to the CAN) causes the can to acquire a ___ charge
A. Negative
In general, the use of a negatively charged object to charge another object by induction causes the other object to acquire a __ charge
A. Positive
Two balloons are being pushed away from each other. The repulsion of these balloons from one another provides evidence that...
A. both balloons are charged with the same type of charge
Balloon A is rubbed with animal fur, Balloon B was rubbed with animal fur. If a negatively charged plastic tube were inserted between the two balloons, then one would observe that the two balloons ___
A. would deflect even more from a vertical orientation
when the positively charged sphere is touched, __ move from the __ to the ___
B. ELECTRONS move from the HAND to the SPHERE
Diagram A is the charging step. How does the sphere become charged?
B. Electrons move from the charged metal bar into the sphere
a teacher rubs a glass object and a felt cloth together and the glass becomes positively charged. Which of the following are true
B. The felt became charged negatively during this rubbing process D. If the glass acquired a charge of +5 units, then the felt acquires a charge of -5 units. G. Once charged in this manner, the glass object and the felt cloth should attract each other
This charge is known as __
B. charging by induction
This process causes the can to acquire a __ charge
B. positive
B is negative A B A C (2nd chart)
Balloon A = + Balloon B = negative Balloon C = + or neutral
B is negative A B C B (first 3)
Balloon A = + or neutral Balloon B = - Balloon C = -
B is negative C B A C (3rd chart)
Balloon A = - or neutral Balloon B = negative Balloon C = + or neutral
when the metal bar is pulled away in Diagram B, the metal bar is__
C still positively charged, but has fewer excess protons than it previously did
An electrically neutral atom is an atom which _
C) has a balance of protons and electrons (the same # of each)
When the pop can is touched by the hand, __ move from the __ to the __
C. ELECTRONS move from the HAND to the CAN
Diagram A is the charging step. How does the sphere become charged?
C. Electrons move from the sphere into the positively charged bar
The process of inducing the movement of charge within a sphere causes positive and negative charge to be separated. This is known as..
C. Polarization
A balloon is charged by rubbing it with animal fur. It is then pressed against a wooden cabinet. The balloon and the cabinet attract, seeming to defy the force of gravity. This attraction is best explained by...
C. Polarization of wood molecules
When the metal bar is pulled away in Diagram B, the metal bar is___
C. Still negatively charged, but has fewer excess electrons than it previously did
A metal sphere is resting upon an insulating stand. A teacher holds a metal bar (with an insulating handle). The teacher uses the metal bar to charge the sphere by conduction. Which one of the following processes describes what the teacher likely did to charge the sphere by conduction?
C. The teacher charged the bar and then contracted it to the sphere
The conducting sphere is ...
C. Uncharged (neutral)
During a physics lab, a plastic strip was rubbed with cotton and became positively charged. The correct explanation
D) the plastic strip lost electrons to the cotton during the charging process
Insulators are different than conductors in that insulators....
D. Do not allow charge to freely move
When the pop can is touched by the hand, ___ move from the ___ to the ___
D. ELECTRONS move from the CAN to the HAND
A negatively charged balloon is brought near a neutral conducting sphere as shown in the diagram at the right. The presence of the charged balloon will cause something to happen in the sphere. Which of the following would you expect to occur?
D. Electrons in the sphere will move to the right side.
When the induction charging process is complete, the balloon is___
D. Still negatively charged, having the same amount of negative charge as it previously did
The process of neutralizing the charged spheres as depicted above is known as
D. grounding
a plastic strip rubbed with cotton and became positively charged. The correct explanation for why the plastic becomes positively charged is that ...
D. the plastic strip lost electrons to the cotton during the charging process
Charged rubber rods are placed near a neutral conducting sphere, causing a redistribution of charge on the spheres. Which of the diagrams below depict the proper distribution of charge on the spheres?
Diagram A and Diagram D
An electrically charged atom (sometimes referred to as an ion) can be distinguished from an electrically neutral atom in that the charged atom (ion)...
E) has an imbalance of protons and electrons (has an unequal number of these)
One balloon is hanging straight down and the other balloon is attracted to it. This is evidence that...
E. Nonsense! this would never happen
Two balloons are drawn to each other. The attraction of these balloons for one another provides evidence that...
E. at least one of the balloons is charged; the other is either charged or neutral
Miss Chiff rubbed her shoes on carpet. Electrons transfer from carpet to shoes to body. MISS CHIFF is now charged with a _(positive, negative) type of charge.
Negative
In a lab report during the Static Electricity unit, Aaron Agin suggests that a sample of wool became positively charged by gaining protons from the rubber balloon. Explain what is wrong with Aarons statement.
Only electrons can move
Explain what is causing the deflection of the water stream
Polarization of the neutral water molecules
The __ reside in the nucleus of atoms and are tightly bound
Protons
saran wrap has a stronger electron affinity than Nylon. If Nylon is rubbed against saran wrap, which would end up with the excess negative charge __ explain
Saran wrap bc it will pull more electrons toward itself
Oppositely-charged objects...
attract
A charged object and a neutral object will...
attract (slightly)
As an object begins to gain or lose ___ from its atoms, it becomes more positively or negatively charged
electrons
___ are located outside the nucleus and are easily removed from or added to atoms
electrons
the charged part of the atom are the _ _
electrons & protons
A negatively charged object has more ... _
electrons than protons
more negatively charged objects have more _ than _
electrons than protons
T OR F When two objects made of different materials are rubbed together, one object gains electrons and the other object gains protons
false
T OR F When two objects made of different materials are rubbed together, they will either be both charged positively or both charged negatively
false
T or F conductors cannot be charged by frictional rubbing. Why?
false.... idk why
when you rub a glass rod with a silk cloth, electrons are transferred from the ___ (glass, silk) to the ___ (glass, silk) As a result, the glass rod acquires a __ charge and the silk cloth acquires a __ charge
from the GLASS to the SILK + , -
Explain what must happen in order for an oxygen atom to become negatively charged
it must accept nearby electrons
Explain what must happen in order for an oxygen atom to become more positively charged
it must give off electrons
an object that is positively charged must have (more, less, the same number of) electrons compared to its protons.
less
an object that is negatively charged must have (more, less, the same number of) electrons compared to its protons.
more
The _ are not charged and thus will not be of importance in this unit
neutrons
Anna Litical One negatively charged balloon near some neutral paper bits at rest on a table. d. Object D is observed to attracts both the paper bits and the balloon, object D must be__
positive
_ are charged positively & _ are charged negatively
protons & electrons
A positively charged object has more... _
protons than electrons
more positively charged objects have more _ than _
protons than electrons
Like-charged objects...
repel
when you pull a cotton sweater off your skin, electrons are transferred from the __ (cotton , skin) to the __(cotton, skin) As a result, your body acquires a __ charge and the sweater acquires a __ charge
skin .. cotton + , -
In terms of electron movement, explain what is happening in Diagrams B and C above. Finally, state the charge acquired by the left and the right can as a result of this process
the left can becomes positive and the right can becomes negative
an object that is electrically neutral charged must have (more, less, the same number of) electrons compared to its protons.
the same # of
Which of these spheres is made of an insulating material and which is made of a conducting material?
the sphere with the even distributed lines around the sphere is the conducting material because they are mobile so they try to get away from each other . The sphere with the lines irregularly distributed inside the sphere is the insulator bc the charge is not allowed to move around freely
Diagram C shows the excess negative charge distributed differently than it is in Diagram B (its now spread even in the sphere) . Explain why the excess negative charge would distribute itself as it does in Diagram C
they are mobile so they try to get far away from each other or negatives in the metal repel one another or the electrons would even out
T OR F When two objects made of different materials are rubbed together, the total amount of charge among the two objects remains unchanged
true
T OR F When two objects made of different materials are rubbed together, they each acquire a charge
true
T OR F When two objects made of different materials are rubbed together, they will attract each other after the charging process
true
