Introduction to Forces

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What is a force?
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A force is a push or pull acting upon an object as a result of its interaction with another object.
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What unit is force measured in?
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Force is measured in newtons (N).
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What is a contact force?
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A contact force is a force that acts on objects when they are touching each other.
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What is a non-contact force?
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A non-contact force is a force that acts on objects without touching them.
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What is gravity?
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Gravity is a non-contact force that pulls objects toward the center of the Earth or any other celestial body.
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What is friction?
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Friction is a contact force that opposes the relative motion or tendency of such motion of two surfaces in contact.
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What is tension in physics?
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Tension is a force experienced by a rope or string when it is pulled tight by forces acting from opposite ends.
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