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forces - Coggle Diagram
forces
contact forces
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normal
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if a book is resting upon a surface, then the surface is exerting an upward force upon the book in order to support the weight of the book.
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friction
Friction is the resistance of motion when one object rubs against another. Anytime two objects rub against each other, they cause friction. Friction works against the motion and acts in the opposite direction. When one object is sliding on another it starts to slow down due to friction.
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The harder two surfaces are pressed together, the more force it takes to overcome the friction and get them to slide.
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non-contact forces
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magnetism
it is produced by the motion of electric charge, which results in attractive and repulsive forces between objects.
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The most powerful magnet in the universe is actually a star called a magnetar. These are stars that have died off and had a supernova explosion. The magnetars are what is left over, and they are strong enough to destroy small planets if they get close enough. Luckily, there are only a dozen of these according to scientists, and they are far far far away from Earth.
Electrostatic
caused by electricity that does not move in a current but is attracted to the surface of some objects
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