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Gravity & Friction HUDA BALD - Coggle Diagram
Gravity & Friction 
Types of Forces
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Contact Forces
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Contact forces can be weak but hitting the keys on a keyboard, but also strong like how the earth's tectonic plates come together.
Noncontact Forces
A force that one object can apply to another object without touching it is called a noncontact force.
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Friction
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Fluid Friction
Friction between a surface and fluid-any material, such as water and air.