11MassWeight

# 11MassWeight - 11 Mass and weight mass: a F i=m i weight:...

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11 Mass and weight mass: weight: force of gravity direction: downwards same mass m in both formulas coincidence? General Relativity??? apparent weight: normal force of scale on feet try bouncing on a scale! i F i = m a w = m g

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Inclined plane #1: (A) 0 (B) +g (C) -g (D) +mg (E) -mg #2, #3: (A) +w sin q (B) –w sin q (C) +w cos q (D) –w cos q (E) 0 #1 #2 #3
Ex: A 75 kg skier starts down a 50m high, 10° slope on frictionless skis. What is his speed at the bottom? Visualize: Which is the correct FBD? more: pictorial representation (A) w (B) w (C) w (D) n w n (E) w n q = 10° h = 50m m = 75 kg s = ? v 0 = 0 s 0 = 0 v = ? s = ?

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Solve: Newton's 2 nd law choose x axis along acceleration: down incline which is Newton's 2 nd along x? which is Newton's 2 nd along y? This gives n. .. w
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## This note was uploaded on 11/14/2011 for the course MECH 115 taught by Professor None during the Fall '06 term at Kettering.

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11MassWeight - 11 Mass and weight mass: a F i=m i weight:...

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