2.  a field is a region of space surrounding an object that can cause another object to experience a force  ex: gravitational field, electric field  a magnetic field is a 3-D region of space surrounding a magnet that will exert a force on magnetic objects

3.  magnets have 2 ends (poles)  unlike poles attract each other while like poles repel each other  the force of attraction or repulsion increases as the magnets get closer to one another

4.  earth has a magnetic field that exists both inside and surrounding it  when a magnet is free to rotate it will align itself with Earth’s magnetic field (compass)

5.  magnetic fields exist in 3 dimensions surrounding a magnet and are more intense at the poles  they are invisible, but can be represented with field lines  point from north to south pole outside a magnet, and from south to north pole inside a magnet  never cross one another  are close together where the magnetic field is stronger

6.  a compass can be used to map the direction of the field lines around a magnet  the needle will align itself along the direction of the field

8.  when opposite poles of two magnets are brought near each other they attract  this happens because of the way the magnetic fields interact

9.  when two like magnetic poles are brought near each other they repel  this also happens because of the way the fields interact

10.  unlike poles attract  like poles repel

11.  the bottom of the train is attracted upwards toward the bottom of the track  the guidance magnet keeps the train along a specific path  floats above track to reduce friction/increase speed  uses magnetic fields for levitation and forward motion

12.  uses incredibly strong magnetic fields to produce very detailed images of the inside of the human body

14.  magnets  electric motors  electric bells  computer hard drive  northern lights  animal migration navigation

15.  magnetic fields cause forces on objects that can be affected by magnets  magnetic fields are three-dimensional  magnetic forces increase as magnetic objects get closer to each other  magnetic fields cause attraction between unlike poles and repulsion between like poles  magnetic field lines represent what a magnetic field looks like around a magnetic object  these lines point from north to south outside the magnet and south to north inside  the lines never cross one another  the lines are close together where the field is stronger