Physics
According to Coulomb’s Law, which of the following actions would increase the electric force between two positively charged particles?
A. Decreasing the mass of the particles
B. Decreasing the distance between the particles
C. Changing the charges from positive to negative
D. Transferring all the charge from one particle to the other
Decreasing the distance between the particles
The subatomic particle that has the positive charge is the
proton
The subatomic particle that has the neutral charge is the
Neutron
The subatomic particle that has the negative charge is the
Electron
Cation is ________
postive
the fundamental rule at the base of all electrical phenomena
What is like charges repel and opposite charges attract
A glass rod is rubbed with silk. Following this process, the glass rod gained a positive charge by...
Removing electrons from the rod
Describe the principle of conservation of charge
Electrons are neither created nor destroyed but are simply transferred from one material to another.
As a student runs a plastic comb through her hair, the comb acquires a negative electric charge. The charge results from the transfer of
Electrons from her hair to the comb
anion is _____
Negative
In a test to see how different amounts of sugar in water affect its freezing time, this is the dependent variable.
What is the freezing time?
If you are brushing your hair and it gives away two electrons to the brush what is the new charge AND NAME of the atom.
Cation with a positive charge
In an experiment to test how fertilizer type affects plant growth, this is the independent variable.
What is the type of fertilizer?
This type of variable is often graphed on the x-axis in an experiment.
What is the independent variable?
In a study measuring the effect of water temperature on fish activity, this variable is manipulated by the experimenter.
What is the water temperature?
While he was studying for this exam, Trey was pacing around a carpeted room wearing socks asking himself physics questions as he walked. After multiple hours of studying and walking, he decided to head to the kitchen to grab a snack. He reaches the doorknob, and he feels a shock. Which of the following best explains why Trey felt a shock?
Trey gained a lot of electrons from the floor, causing him to gain a negative charge. This also resulted in Trey having a higher voltage than the doorknob.
Two balloons with separate charges of +2.5x10‐7 C and – 1.7x10‐7C are separated by a distance of 0.38 meters
The electrical force between the two balloons is -----
ex. what is their interaction going to look like
A force of attraction because the opposite charges of the two balloons attract each other.
A balloon is held over paper after being charged by friction and the paper jumps on the balloon. This is an example of what?
Charged by induction
name a similarity between charged by friction and charged by contact.
Both have to make contact with an item
In a study of how caffeine affects heart rate, what variable is dependent on caffeine intake?
the heart rate
what correctly describes what happens when you rub a balloon on your shirt?
ex. what kind of charging, what are protons/electrons doing
the balloon loses protons, becoming negatively charged.
Charging by friction
The part of the atom that is transferred when objects become charged is the
Electron
Two balloons with separate charges of +2.5x10‐7 C and – 1.7x10‐7C are separated by a distance of 0.38 meters.
Calculate the electrical force of attraction between the two balloons.
‐2.65x10‐3N
Two balloons with separate charges of +2.5x10‐7 C and – 1.7x10‐7C are separated by a distance of 0.19 meters.
‐1.06x10‐2N
An electrostatic force exists between two charged objects both with a charge of +3.20x10‐19C. The objects are separated by a distance of 0.030 meters. As the distance between the two charges is decreased, the electrostatic force offer.
ex. is it attracting or repelling, will it increase or decrease
Repulsion between the two charges increases