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Lecture 11

# Lecture 11 - Lecture 11 pls-11.1 Nonequilibrium...

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Lecture 11 pls-11.1 Nonequilibrium Applications of Newton’s 2 nd Law Media: 1. Equipment for Laboratory 4 1. Nonequilibrium Clicker question 1 . If 0 i i F r for an object, then the object is not in equilibrium 2. The Four Steps 4 steps: 3. An Example An kg 205 = m log is accelerated up the hill with an acceleration of 2 m/s 0.8 . 9 . 0 = k µ . What is the tension T in the rope? (i) Draw a free-body diagram (ii) Choose perpendicular y x axes, resolve forces into components (iii) Apply N’s 2 nd law: x i ix a m F = , y i iy a m F = (iv) Algebra… 30°

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pls-11.2 (i) Clicker question 2 . ( i i ) (iii) x : x k ma mg f T = o 30 sin y : 0 30 cos = o mg F N (iv) Auxiliary eqn.: N k k F f µ = . Use auxiliary eqn. to eliminate k f in x eqn.: x N k ma mg F T = o 30 sin . Use y eqn. to eliminate N F in this eqn.: ( ) x k ma mg mg T = o o 30 sin 30 cos . Solve this eqn. for () N 2734 30 sin 30 cos = + + = o o mg mg ma T k x M m motion sensor
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Lecture 11 - Lecture 11 pls-11.1 Nonequilibrium...

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