PHYS201 Lecture Notes - Lecture 10: Net Force, Inelastic Collision, Elastic Collision

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Product if mass and velocity of an object. The total momentum of a system of objects is the vector sum of the momenta of all the objects. The net force acting on an object is equal to the change in its momentum divided by the time interval during which the change occurs impulse = force * time = f * t. Great force for long time equals large impulse. Same force for short time equals smaller impulse. Impulse and momentum: therefore, the same change in momentum may be produced by a large force acting for a short time, or by a smaller force acting for a longer time. Cases of momentum changes: decreasing momentum over a longer time results in smaller force. When a car is out of control, it is better to hit a haystack than a concrete wall: same impulse occurs either way, but extension of hitting time reduces hitting force.

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