词汇:Compass, Float/Levitate, Search/Find, Treasure Hunt, Discover 句型: • “A compass uses a magnet to find north.” • “Let’s search for hidden treasures in the sand!”
These are magnets they have two poles north and south like magnetic poles repel each other opposite magnetic poles attract each other
There’s a magnet and a glass with blue plastic beads and another glass with some red paper clips what do you think will stick to the magnet let’s try the blue plastic beads do not stick to the magnet paper clips are made out of metal think they’ll stick to the magnet
Here we go The red paper clips went straight to the magnet so the magnet does stick to the metal paper clips but not to the plastic beads
Magnificent objects that create an area of magnetic force around them which is invisible to the human eye this area is known as the magnetic field if a magnetic object is inside that area it gets attracted towards the magnet and moves towards it without any physical contact looks like magic isn’t it now what’s a magnetic objects that get attracted to a magnet are called magnetic objects and the objects that do not get attracted to a magnet are called non-magnetic objects for example a piece of wood won’t even move if kept near a magnet but objects that contain ironical and cobalt will definitely get to the magnet when you keep a magnet freely
The end that points to the north is called the North Pole of the magnet and the end that points south is called the South Pole of the magnet well I have a fun experiment for you take these two magnets the north and south pole should be marked on these magnets now bring the like post near and see what happens there you go these magnets repel each other now bring the unlike both near see the magnets that unlike both attract each other and like poles repel each other
If you cut a magnet into two it wants its magnetic field but would give you two new magnets
Mix of iron and nickel given the herb its own magnetic field if a magnet has a strong magnetic field it can pull objects even underwater