define force and friction how they are useful to us
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force is a push or pull
friction is a force that resist relative motion between two bodies in contact
friction is a force that resist relative motion between two bodies in contact
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A force is any interaction that, when unopposed, will change the motion of an object. A force can cause an object with mass to change its velocity, i.e., to accelerate. Force can also be described intuitively as a push or a pull. A force has both magnitude and direction, making it a vector quantity.
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