Magnetic Forces
Around each magnet, there is an invisible force field called
magnet field
Electromagnets are different than magnets. How
Turn off/on, change polarity, control strength
Electric charges are from ______________ and _______________________
protons, electrons
push or pull applied to an object
force
How many degrees are in a circle?
360
like poles _____
repel
How can you increase the strength of an electromagnet?
increase coil (solenoid) or increase electricity (battery)
force of attraction or repulsion between objects due to their charges
electric force
includes the speed and direction of and object
velocity
What is the slowest living mammal on earth?
sloth
Two materials other than iron that are magnetic are
cobalt , nickel
What are some real world examples of an electromagnet? (more than one)
MRIs, headphones, generators, my door
opposite charges __________
attract
a force that can act at a distance
non contact force
Who invented the telephone
Strength of force between two magnets depends on
the distance between them
In an electromagnet, wire coils are wound around a magnetic object to generate a magnetic field. What is the relationship between the number of coils and the strength of the magnetic field
More coil= stronger
accumulation of excess electric charges on an object
static electricity
measure of gravitational force on an object
weight
What degree is a right angle
90
The region where the magnet is the strongest is
magnetic pole
Why is the Earth a giant magnet?
The center is molten iron.
Electric forces increase as the _____ of the charge increases.
magnitude
The acceleration of an object depends on the mass of the object and the amount of force applied is
Newton's Second Law
What is another name for the perimeter of a circle?
circumference