Unformatted text preview: lbs 2 Sketch  FBD Substitute into U 12 equation? EX7.2 50lb Slider What is your first step? Solution: Problem Type: Find: Given: W=50 lbs, v 1 =2 ft/s, μ k =0.5, x=4 in, diagram V 2 : Velocity when spring is compressed to x Has displacement, springs and velocity, probably should us WorkEnergy Write out the WorkEnergy Relationship ft x x 33 . 3 12 4 3 = ⇒ + = ( 29 lbs N N F y 25 60 cos 50 = = °⇒ = ∑ ( 29 ( 29 lbs ft U dx x x U • = +° +=∫ . 20 9 100 12 1 33 . 3 60 sin 50 25 * 5 . 2 1 4 2 2 1 T 1 = 0.5 mv 1 2 = 0.5*[50/32.2] 2 2 =3.10 ft lbs v 2 =5.46 ft/sec...
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 Spring '05
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 Force, initial velocity v1of

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