Double sided magnets that sticks to glass

Magnets are only attracted to a few вЂmagneticвЂ™ metals and not all matter.

Magnetic forces are non contact forces they pull or push on objects without touching them.

Similar magnetic poles repel and unlike magnetic poles attract each other. The вЂnorth poleвЂ™ of a magnet takes this name because it always points towards the EarthвЂ™s north geographic magnetic pole. direction finding magnetic compasses rely on this principle to operate.

These names originate from the observation that magnets will align in the direction of the EarthвЂ™s weak magnetic field if allowed to swing freely i.e. The magnetic fields surrounding all magnets are said to have two poles, called North and South. All of these actions cause the individual atoms to lose their alignment. They will also lose their permanent magnetic properties if heated strongly. Typical magnets found around the house or used in guitar вЂpick upsвЂ™ or fish tank glass cleaners are constructed with ferromagnetic materials and can produce permanent magnetic fields with intensities up to 3000 times that of the EarthвЂ™s magnetic field.ДЇerromagnetic materials are usually very brittle and will easily chip or fracture if dropped or allowed to slam together. They can also remain aligned when the surrounding field is removed creating a permanent magnet. However if the surrounding magnetic field is strong enough, it is possible for them to align so they each contribute to produce a stronger magnetic field in the material (see Figure 2). Normally the magnetic field around each atom points in a random direction resulting in them cancelling each other out (see Figure 1). The atoms in ferromagnetic materials are different because they can behave like little magnets. Stronger industrial magnets can be made with these and the addition of more expensive rare earth elements.

These materials are based on mixtures of iron, nickel or cobalt as these are the only three known ferromagnetic elements. fridge magnets, door catches and magnetic toys) are manufactured from materials which areДЇerromвЂ‹agnetic. The vast majority of magnets we encounter (e.g. The other two forces areД®lectrostatic and gravitational (see the focus idea Magnetic attraction and repulsion is one of three fundamental non contact forces in nature. However, the vast majority of the magnetic fields around us are simply too weak to cause any observed effects or remain вЂremoved from usвЂ™ because they are utilised in more complex machines like electric motors and computer hard drives. the EarthвЂ™s magnetic field and magnetic fields produced by electric current). Magnetic fields in our everyday experiences (e.g. Maloney, OвЂ™Kuma, Heieggelke & Van Heuvelen (2001) Scientific view Understandably their naive model has no predictive or explanatory power and they typically do not perceive the need to do more than identify and label the attractive or the less frequent repelling behaviour as magnetic. However, many younger students simply associate magnetism with a вЂpulling forceвЂ™. It is well established that older students hold a range of views about magnetism that vary considerably in their sophistication, ranging from magnetic models with surrounding вЂcloudsвЂ™ of action to ideas about вЂelectric raysвЂ™ and вЂfieldsвЂ™. StudentsвЂ™ confusion around non contact forces is explored in the focus idea For example, a balloon вЂrubbedвЂ™ with a cloth resulting in its attraction to another object is frequently described incorrectly by young students (and even some adults) as having been вЂmagnetisedвЂ™ in some way. To them, these often appear to be common experiences of the same invisible non contact force, usually only attraction. They do not see the need to discriminate between magnetic forces and electrostatic forces (or gravity). Many younger students are yet to form strong views or in many cases any views at all about how magnets interact with matter or each other. Toys very rarely make use of magnetic repulsion. wooden train carriages) or are used in simple childrenвЂ™s construction toys to allow them to quickly assemble more complex structures without the need for messy adhesives or difficult connections.

Many childrenвЂ™s toys employ weak magnets to вЂstickвЂ™ materials together (e.g. Magnetic materials are regularly encountered around the home, often holding small objects on the kitchen fridge or keeping cupboards and fridge doors closed. Many young students will have had memorable but often confusing experiences with magnets and magnetic materials.

Contrasting student and scientific viewsД¬ontrasting student and scientific views Student everyday experiences.

Double sided magnets that sticks to glass