Magnetic Forces
Where is the magnetic field the strongest on a bar magnet?
What are two variables that affect the strength of the electric force between two charged objects?
The total amount of charge on both objects and the distance between the objects
What are the three minimum requirements for a complete circuit?
source of electric energy (battery), electric device (light bulb), an electric conductor (wiring)
Increase the current in the wire, increase the number of coils, use a magnetic core
What is the relationship between gravitational force and mass?
When the mass increases on one or both objects, the gravitational force also increases.
When two similar poles are pushed together or when two opposite poles are pulled away from each other
The method of charging an object without touching it is called what
induction
The movement of electrically charged particles is called an _________
electric current
What are the three main parts of an electric motor?
a coil of wire connecting to a rotating shaft, a permanent magnet, a source of electric energy
What type of relationship does gravitational force and mass have?
proportional relationship
In ferromagnetic materials, all the magnetic domains are all lined up in the same direction (TRUE of FALSE)
TRUE
What are the four examples of electric insulators mentioned in the section of the book?
glass, rubber, wood, air
Which type of circuit DOES NOT allow electric energy to flow through the circuit?
Open
An electric generator is a device that uses a magnetic field to transfer _______ energy to electric energy
mechanical
What is the relationship between gravitational force and distance?
as the distance between two objects increases, the attraction between objects decreases
In bar magnets, opposite poles attract or repel (PICK ONE)
Attract
An unbalanced negative or positive electric charge on an object is sometimes referred to as ______ charge.
Static
The electrical potential energy difference between two places on a circuit is called _______
voltage
An electric generator is a device that uses a magnetic field to transfer mechanical energy to ______ energy
electric
What type of relationship does gravitational force and distance have?
an inverse proportional relationship
In bar magnets, like poles attract or repel (PICK ONE)
repel
An __________ charged object has an unbalanced amount of positive charge or negative charge.
electrically
What is a closed circuit?
a circuit without interruption, providing a continuous path through which a current can flow.
What is the difference between direct current and alternating current?
Direct current, the electric current only flows in one direction and alternating current, the current changes direction in a regular pattern.
What does weight actually measure?
weight is the gravitational force exerted on an object