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### Course: Middle school physics>Unit 2

Lesson 4: Magnetic forces

# Magnetic forces

Magnets attract or repel each other through magnetic forces. These forces depend on the orientation of the magnets and their distance from each other. The strength of a magnetic force depends on the strength of the magnets and the distance between them. Stronger magnets can even levitate trains! Understanding these forces helps us use magnets in everyday life. Created by Khan Academy.

## Want to join the conversation?

• Is there a force which increases when the distance increases?
• Elastic forces tend to do this. Imagine stretching a rubber band. The more you stretch it, the more force is exerted.
• so what exactly is the difference between an electrical force and a magnetic force?? apart from the units that are used
• Hi,
A magnetic force is when magnetic forces(North and South Poles) interact with each other. This may be shown by movement(for an example: Your refrigerator magnet attracts, moves toward the fridge, and stick onto the fridge) between these magnetic poles.
An electrical force is when electrons(very, VERY, VERY small particles that produce electrical charges) move and interact with each other(for an example: When you touch a doorknob, you feel a shock because electrons are traveling between you and your hand).
Hope this helps!
• Anyone ever heard of Magnetic Hill, Moncton, NB? If yes, you might have heard that a magnetic force pulls you up a hill, but it's just an illusion. What you see, is a hill, but for real, you're going downhill.
• But, why does north repel north and south attract north?
• This happens because magnets create something called a "magnetic field" around them. The magnetic field is like an invisible force that extends around the magnet. When two magnets come close, their magnetic fields interact. When the magnetic fields interact, they can either push or pull on each other, depending on their poles.
• what if a make a metal car and put a big horse shoe magnet infront of it would the car move forward
• Even with a very strong and large magnet, it would still not be able to directly propel a metal car forward on its own. The magnetic force generated by a magnet, no matter how strong, is generally not powerful enough to overcome the inertia and resistance of a car's mass and friction with the ground.

To move a car forward, you need a propulsion system that can generate a significant amount of force to overcome these factors. In most cases, cars are propelled by internal combustion engines, electric motors, or other types of propulsion systems that convert fuel or energy into mechanical motion.

While a strong magnet can have a significant magnetic field and exert a strong force on magnetic materials, its influence diminishes rapidly with distance. The magnetic force also primarily affects materials that are attracted to magnets, such as iron or steel, and not necessarily the entire car.

In summary, even a very strong and big magnet would not be able to move a metal car forward on its own. Other forms of propulsion systems are needed to generate the necessary force and power to move a car.
• Magnets are amazing!
• I so agree!!
(1 vote)
• Others (magnets) are so strong that even tiny ones can be almost impossible to pull apart. could you explain this statement more ?
• It's saying that some magnets are so strong that even when the magnet it's self is small, the force is strong.
• If you take two south poles and take them away from eachother does the force increase?
• No, the force will still decrease because you are moving both magnets away from each other, causing less amounts of force to repel from each other.
(1 vote)
• what does the n and s stand for I was just wondering
• North and South
• how are magnets created?
• Magnets can be created through a process called magnetization. There are different ways to magnetize certain materials, such as iron, nickel, or cobalt, to make them become magnets. Here are a couple of common methods:

Electromagnetism: You can create a temporary magnet using electricity. This is how electromagnets work. When an electric current flows through a wire wrapped around a core made of magnetic material, such as iron, it creates a magnetic field. This magnetic field makes the material behave like a magnet as long as the current is flowing. When the current is turned off, the magnetism disappears.

Ferromagnetism: Certain materials, such as iron, can become permanent magnets. They have tiny magnetic regions called domains that are naturally aligned in a random manner, canceling out their overall magnetism. By applying a strong magnetic field to the material or stroking it with a magnet, the domains can align and create a stronger magnetic field. This process is called magnetization, and it makes the material into a permanent magnet.

It's important to note that not all materials can be easily magnetized. Materials like wood, plastic, or glass are not attracted to magnets because their atoms and electrons are arranged differently, preventing them from easily aligning their magnetic domains.

So, magnets are created through processes like electromagnetism or magnetization, either by using electricity or aligning the magnetic domains in a material to create a magnetic field.