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Introductory Physics Homework Help
Two blocks sliding down an incline
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[QUOTE="oneamp, post: 4538990, member: 487151"] [h2]Homework Statement [/h2] The figure shows two packages that start sliding down a 20 degree ramp from a rest a distance d=6.6m along the ramp from the bottom. Package A has a mass of 5.0kg and a coefficient of friction 0.20. Package B has a mass of 10kg and a coefficient of friction of 0.15. How long does it take package A to reach the bottom? Illustration shows A closer to the ground on the ramp, with B directly behind (and in contact with) it. [h2]Homework Equations[/h2] [h2]The Attempt at a Solution[/h2] I made a free body diagram for each block. A --- m = 5kg mu_k = 0.20 f_k = 9.21 N n = 46.04 N F_G_x = -16.76 N F_G_y = -46.04 N B --- m = 10kg mu_k = 0.15 f_k = 13.82 N n = 92.1 N F_G_x = -33.52 N F_G_y = -92.1 N ------ Third law stuff: F_(a on b) = F_(b on a) = simply 'F' below. a_a = a_b (acceleration constraint) --- sum of x for A: -7.55 + F = ma = (5)(a) for B: -19.7 + F = ma = (10)(a) solve the system of equations: a = -2.43 m/s^2 kinematics: t = 2.335 But -- my answer is wrong. Why? Thank you [/QUOTE]
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Introductory Physics Homework Help
Two blocks sliding down an incline
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