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Lecture 12 Newton’s Laws of Motion
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Amount that the IRS has spent since 2006 on an outsourced program to collect unpaid taxes: $87,000,000
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Amount the contractors have collected during that time: $50,000,000
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QUIZ Find this vector’s magnitude and angle with respect to the positive x axis and draw it Find the x- and y-components of the vector
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What Causes Motion? In the absence of any forces acting on it, an object will continue moving forever. Motion needs no “cause.” Slide 4-8
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Slide 4-9 Seat Belts: An Application of Newton’s First Law
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Catalogue of Forces
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Spring Force F sp Slide 4-13
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Tension Force Slide 4-14
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Normal Force Slide 4-15
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Slide 4-16 Friction f k and
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Drag and Thrust Slide 4-17
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Example A block is dragged uphill by a rope. Identify all forces acting on the block. Slide 4-19
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Exercise A ball, hanging from the ceiling by a string, is pulled back and released. Identify the forces acting on it just after its release. Slide 4-21
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Newton’s Second Law Physics added to motion:
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Example An elevator, lifted by a cable, is going up at a steady speed. Identify the forces acting on the elevator. Is T greater than, equal to, or less than w? Or is there not enough information to tell? Slide 4-23
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Free body diagrams Make diagram of object showing all forces acting on it (as vectors). For now object will be represented by a point. Decide on the x and y-axes Find x- and y-components of each force Find Show F NET on diagram
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Problems due Today 3: 26, 28, 30, 33, 70, 72
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Problems due Friday Reading: 4: 5-8 Problems: 4: CQ1, MC21, 4, 7, 8, 9, 10, 11
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