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Physics Topic 12
Vocab and Study Guide
|study of electric charges, the forces between them, and their behavior in materials.
|electrical property of material that dictates how two particles interact.
|unit of electrical charge
|force of attraction or repulsion that a charged object exerts on other objects.
|law that describes the forces between two charged objects.
|Materials that do not easily share an electric charge
|material that allows electric charges to flow freely.
|insulators that can be made to conduct by adding impurities to it.
|materials that will conduct electricity without any resistance at an extremely low temperature.
|transfer of charge through direct contact.
|realignment of a charge in a neutral object in the presence of a charged object.
|process of removing excess charge by proving an alternate path for charge to flow.
|charging without contact.
|What is the electrical force of a proton, electron, and neutron?
|positive, negative, no charge
|Explain the difference between gravitational and electrical forces
|Gravitational forces are always attractive and electrical forces are both attractive or repulsive.
|Explain how an object becomes positively charged and negatively charged
|When you remove a negatively charged particle the object becomes positive. If you add a negatively charged particle the object becomes negative.
|Describe what you do physically and what happens atomically when you charge an object a) conductively b) conductively through friction
|a) touching it b) rubbing it with friction
|Describe what you do physically and what happens atomically when you charge an object inductively
|nductively- You dont touch it! You bring a negatively charged object towards two neutral touching objects. The positive particles move towards the rod and the negative particles transfer to the other balloon. It is a realignment of charge (polarization).
|Provide an example of charge polarization
|You put a negatively charged rod close to the balloon (neutral). Polarization occurs when the positive forces go to the side of the balloon closest to the negatively charged rod and the negative forces go to the other side.
|What is charge polarization?
|Realignment of a charge a neutral object in the presence of a negative charge.
|State the mathematical term of coulomb's law and explain it
|k=q1q2/d^2 calculating electrical forces depends on the charges of two objects divided by the distance between them.
|Using the tape from the "another force lab" you bring a charged object near tape A and tape B. You observe that the object is attracted to tape A and repelled by tape B. What type of charge does the object have.
|The charged object must be the same force as B because its repelled by it.
|level 3: what is the electric force between object A with a charge of 4.0x10^-6 that is 5 cm away from object B with a charge of -4x10^-6. Is it an attractive force or repulsive?
|step 1: convert 5 cm to .05 mm (4x10^-6)(-4x10^-6) / (0.05)^2 Its attractive because of 4/-4 it would be repulsive if they were 4/4
|You observe that the object is attracted to tape A and repelled by tape B. What happens to the electric force when you double both charges A and B?
|You observe that the object is attracted to tape A and repelled by tape B. What happens to the electric force when you double the distance between A and B?
|1/4th the distance
|Explain the salt and pepper lab and how it works
|The balloon is rubbed with a cloth to conductively charge making it negatively charged. We induce the charge because the oppositely charged salt and pepper are attracted to the force of the negatively charged balloon.
|Two negatively charged balloons are suspended and separated by 10cm. What happens when you bring in a third balloon that is negatively charged and why? b) what happens if the third balloon is positively charged and why?
|a) they all push away (neg) b) the balloons attach (pos)