Impulse


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From Newton's First Law, we know that an object in motion will stay in motion, unless the object is subjected to an external force. In other words, an object's velocity is constant unless there it is accelerated by some external force. Equivalently, an object's momentum is constant, unless there is an external force,

We have a name for the change in momentum of an object: impulse. We write this as which says impulse () is (=) the change () in momentum (), which equals mass times velocity.

Recall that when an object is being accelerated, In other words, the change in velocity is the average acceleration times the length of time the object was accelerated. What can we conclude if we multiply both sides by mass ?

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