Lecture_20_2007

Lecture_20_2007 - Lecture 19 in a nutshell Momentum = m = P...

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Lecture 19 in a nutshell f i F t - = p p F t impulse = m = υ Momentum = P Units kgm/s momentum is a vector 1 2 1 2 f f i i + = + p p p p During collisions, total final momentum=total initial momentum There are three types of collision Elastic KE is conserved Inelastic KE is lost Completely Inelastic or sometimes “ perfectly inelastic KE is lost, because the objects stick together In other words if objects stick together KE must be lost

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Conservation of momentum on 2D Momentum is conserved in 2D We just have to find the components of momentum in the x and y directions A 1000kg car moving at 15m/s is driving east and collides with a 3000kg truck driving north at 10m/s. The vehicles lock together . Q. What is the final direction and velocity
Conservation of momentum on 2D A 1000kg car moving at 15m/s is driving east and collides with a 3000kg truck driving north at 10m/s. The vehicles lock together . Q. What is the final direction and velocity 1 15 / i m s = υ 2 10 / i m s = υ 12 f υ θ 1 m 2 m 1 2 m m + N/y E/x Total P East initial 1 1 2 2 ix ix m m + υ υ 1 1 i m = υ Total P East final ( 29 1 2 12 cos f m m θ + υ Total P North initial 1 1 2 2 iy iy m m + υ υ 2 2 i m = υ Total P North final ( 29 1 2 12 sin f m m θ + υ

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Conservation of momentum on 2D A 1000kg car moving at 15m/s is driving east and collides with a 3000kg truck driving north at 10m/s. The vehicles lock together .
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