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05-Partial_Momentum

05-Partial_Momentum - Impulse& Momentum 1 F = m a ∆ t...

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Unformatted text preview: Impulse & Momentum 1 F = m a ∆ t F v i m F v f m F = m ∆ v/ ∆ t F = m (v f –v i )/ ∆ t F ∆ t = m (v f –v i ) F ∆ t = mv f – mv i Im p u lse F i n a l M o m e n t u m In itia l M o m en tu m Impulse & Momentum 2 ∆ t F v i m F v f m F ∆ t = mv f – mv i F ∆ t = mv f – mv i F ∆ t = mv f – mv i F ∆ t = F ∆ t A force of 1N acting for 100 s will cause the same change in momentum as a force of 100 N acting for 1 s. Sample Problem 1 F ∆ t = m ∆ v v i m ∆ t v f m F F ∆ t = m (v f –v i ) v i = 50.0 m/s ∆ t = .0110 s v f = -v i F = ? N F = [ m (v f –v i )]/ ∆ t m = .0400 kg F = [ .04 (-50 - 50)]/.011 F = -364 N F 2245-90 lb Sample Problem 2 F ∆ t = m ∆ v v i m ∆ t F F ∆ t = m (v f –v i ) v i = 50.0 m/s ∆ t = .0110 s v f = 0 F = ? N F = [ m (v f –v i )]/ ∆ t m = .0400 kg F = [ .04 (0 - 50)]/.011 F = -182 N F 2245-45 lb Variable Impact Force F t F max F av t 1 t 2 F∆t = m∆v ∫ Fdt = m∆v ∫ Fdt = Area under the graph of F vs t...
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05-Partial_Momentum - Impulse& Momentum 1 F = m a ∆ t...

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