PHYA11H3 Chapter 9: Chapter 9 Impulse and Momentum
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12 Dec 2016
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Collision: a short-duration interaction between two objects. Impulsive force: a large force exerted for a small interval of time. Momentum: therefore impulsive force is a function of time, fx(t) Momentum, : the product of a particle"s mass and velocity. Like an vector, can be decomposed into x- and y-components: the units for momentum are kg m/s px= mvx py= mvy. An object can have a large momentum by having either a small mass but a large velocity or a small velocity but a large mass. The momentum component px has the same sign as vx: momentum is negative for particle moving to the left (on the x-axis) or down (on the y- axis) Force is the rate of change of momentum. Impulse has units of n, which are equivalent to kg m/s, the units of momentum. The change in the particle"s momentum is px= pfx - pix = (cid:4666)(cid:4667)
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